Pub Date : 2025-02-01DOI: 10.1016/j.precamres.2024.107660
Mahendra Shukla , Sanjeet K. Verma , Vivek P. Malviya , Elson P. Oliveira , Sumit Mishra , Ravi K. Umrao , Satya Prakash , Erik Emmanuel M. Torres
The Paleoproterozoic Dudhi Granitoid Complex is composed of numerous granitoid intrusions and gneissic components that is located in the Mahakoshal belt, which is an important supracrustal belt of the Central Indian Tectonic Zone (CITZ) and played a vital role in the crustal accretion of the Columbia supercontinent. Thus, we present new geochemical data, Sm-Nd isotope analyses, and U-Pb geochronology of the granitic gneisses from the Dudhi Granitoid Complex to understand their origin, evolution and tectonic setting. The LA-ICP-MS zircon U-Pb dating yields ages of 1707.9 ± 7.4 Ma, 1724.3 ± 8.6 Ma, 1736.8 ± 9.9 Ma, 1748.3 ± 7.9 Ma, and 1756.3 ± 10 Ma for studied granitic gneisses. These rocks are strongly metaluminous and show enrichment in high field strength elements (HFSE) and depletion in large ion lithophile elements (LILE). The trace element composition allows classifying these rocks as an A2-type affinity in an extensional environment. They show negative values of ɛNd(t) (−5.7 to −0.4) and old Nd-model ages (TDM: 2068–2420) support their crustal origin. Geochemical and Nd isotope data indicate that they were derived by partial melting of older granites and granitic gneisses crust i.e., Archean Bundelkhand crust and Paleoproterozoic (>1.9 Ga) juvenile crustal basement of the Mahakoshal basin. Finally, their magmatism during 1.75–1.70 Ga is linked to the transition period of accretion and dispersal of the Columbia supercontinent, which is incorporated into the lithosphere of the CITZ.
{"title":"Crustal reworking during the transition of tectonic regime in the Paleoproterozoic Era: Constraints from geochemistry, Sm-Nd isotope and U-Pb geochronology of granitic gneisses, Dudhi Granitoid Complex, Mahakoshal belt, Central Indian Tectonic Zone (CITZ), India","authors":"Mahendra Shukla , Sanjeet K. Verma , Vivek P. Malviya , Elson P. Oliveira , Sumit Mishra , Ravi K. Umrao , Satya Prakash , Erik Emmanuel M. Torres","doi":"10.1016/j.precamres.2024.107660","DOIUrl":"10.1016/j.precamres.2024.107660","url":null,"abstract":"<div><div>The Paleoproterozoic Dudhi Granitoid Complex is composed of numerous granitoid intrusions and gneissic components that is located in the Mahakoshal belt, which is an important supracrustal belt of the Central Indian Tectonic Zone (CITZ) and played a vital role in the crustal accretion of the Columbia supercontinent. Thus, we present new geochemical data, Sm-Nd isotope analyses, and U-Pb geochronology of the granitic gneisses from the Dudhi Granitoid Complex to understand their origin, evolution and tectonic setting. The LA-ICP-MS zircon U-Pb dating yields ages of 1707.9 ± 7.4 Ma, 1724.3 ± 8.6 Ma, 1736.8 ± 9.9 Ma, 1748.3 ± 7.9 Ma, and 1756.3 ± 10 Ma for studied granitic gneisses. These rocks are strongly metaluminous and show enrichment in high field strength elements (HFSE) and depletion in large ion lithophile elements (LILE). The trace element composition allows classifying these rocks as an A<sub>2</sub>-type affinity in an extensional environment. They show negative values of ɛNd(t) (−5.7 to −0.4) and old Nd-model ages (T<sub>DM</sub>: 2068–2420) support their crustal origin. Geochemical and Nd isotope data indicate that they were derived by partial melting of older granites and granitic gneisses crust i.e., Archean Bundelkhand crust and Paleoproterozoic (>1.9 Ga) juvenile crustal basement of the Mahakoshal basin. Finally, their magmatism during 1.75–1.70 Ga is linked to the transition period of accretion and dispersal of the Columbia supercontinent, which is incorporated into the lithosphere of the CITZ.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"417 ","pages":"Article 107660"},"PeriodicalIF":3.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143137427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-01DOI: 10.1016/j.precamres.2024.107636
Entao Liu , Detian Yan , Jian-xin Zhao , Jingbin Wang , Yuexing Feng , Lifeng Zhong , Hua Jiang , Nengping Shen , Junming Zhan
Widespread fibrous dolomite cements in upper Ediacaran Dengying Formation’s botryoidal dolomite were traditionally thought to form through secondary processes, but recent studies indicate they were likely the direct products of unique “dolomite seas” conditions. To elucidate botryoidal dolomite’s formation and the unique “dolomite seas,” it’s vital to date the age variability in its dolomite cements via absolute methods. In this study, we performed the first comprehensive geochronological and geochemical (C-O-Sr-REE) analyses on a representative botryoidal dolomite hand specimen PTHB-1, which is divisible into three distinct components: microbialite matrix, fibrous marine dolomite, and crystalline dolomite. Through in-situ laser-ablation ICP-MS U-Pb analyses of 720 meticulously selected laser spots across the specimen, we obtained a dataset of 14 U-Pb age determinations for the various dolomite cements. Notably, ten laminae of U-enriched fibrous dolomite cements yielded ten high-precision U-Pb ages bracketing a time range between 550.1 ± 8.0 Ma and 542 ± 14 Ma (weighted mean 546.8 ± 3.2 Ma), aligning chronologically with the stratigraphic age interval (551.1–542 Ma). These findings, coupled geochemical signatures and petrographic evidence, suggest that the fibrous dolomite cements were initially direct marine precipitates, challenging previous secondary genetic interpretations. This revelation points to a short-lived “dolomite sea” existed in the terminal Ediacaran Ocean in the upper Yangtze region. Conversely, the later stages of vug-filling crystalline dolomite cements exhibit pronounced positive Eu and Y anomalies along with lower δ13C and δ18O, indicating hydrothermal fluid precipitation. Our results reveal at least three phases of crystalline dolomite cements at ca. 411 ± 17 Ma, 358.7 ± 6.1 Ma, and 257.2 ± 8.4 Ma, respectively, contributing significantly to the modification of reservoir properties. The insights gleaned from this research provide crucial chronological data for comprehending the formation and evolutionary history of botryoidal dolomite reservoirs, with substantial implications for hydrocarbon exploration efforts.
{"title":"Spatial U-Pb age distribution in botryoidal dolomite in the terminal Ediacaran Dengying Formation, South China: Constraints on “dolomite seas” and formation process","authors":"Entao Liu , Detian Yan , Jian-xin Zhao , Jingbin Wang , Yuexing Feng , Lifeng Zhong , Hua Jiang , Nengping Shen , Junming Zhan","doi":"10.1016/j.precamres.2024.107636","DOIUrl":"10.1016/j.precamres.2024.107636","url":null,"abstract":"<div><div>Widespread fibrous dolomite cements in upper Ediacaran Dengying Formation’s botryoidal dolomite were traditionally thought to form through secondary processes, but recent studies indicate they were likely the direct products of unique “dolomite seas” conditions. To elucidate botryoidal dolomite’s formation and the unique “dolomite seas,” it’s vital to date the age variability in its dolomite cements via absolute methods. In this study, we performed the first comprehensive geochronological and geochemical (C-O-Sr-REE) analyses on a representative botryoidal dolomite hand specimen PTHB-1, which is divisible into three distinct components: microbialite matrix, fibrous marine dolomite, and crystalline dolomite. Through <em>in-situ</em> laser-ablation ICP-MS U-Pb analyses of 720 meticulously selected laser spots across the specimen, we obtained a dataset of 14 U-Pb age determinations for the various dolomite cements. Notably, ten laminae of U-enriched fibrous dolomite cements yielded ten high-precision U-Pb ages bracketing a time range between 550.1 ± 8.0 Ma and 542 ± 14 Ma (weighted mean 546.8 ± 3.2 Ma), aligning chronologically with the stratigraphic age interval (551.1–542 Ma). These findings, coupled geochemical signatures and petrographic evidence, suggest that the fibrous dolomite cements were initially direct marine precipitates, challenging previous secondary genetic interpretations. This revelation points to a short-lived “dolomite sea” existed in the terminal Ediacaran Ocean in the upper Yangtze region. Conversely, the later stages of vug-filling crystalline dolomite cements exhibit pronounced positive Eu and Y anomalies along with lower δ<sup>13</sup>C and δ<sup>18</sup>O, indicating hydrothermal fluid precipitation. Our results reveal at least three phases of crystalline dolomite cements at ca. 411 ± 17 Ma, 358.7 ± 6.1 Ma, and 257.2 ± 8.4 Ma, respectively, contributing significantly to the modification of reservoir properties. The insights gleaned from this research provide crucial chronological data for comprehending the formation and evolutionary history of botryoidal dolomite reservoirs, with substantial implications for hydrocarbon exploration efforts.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"417 ","pages":"Article 107636"},"PeriodicalIF":3.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143137578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-01DOI: 10.1016/j.precamres.2024.107671
Xiufang Wang , Hui Ye , Yuan Gao , Matthew J. Brzozowski , Xiang Li , Ru-Xiong Lei , Chang-Zhi Wu
Deposition of Neoproterozoic iron formations (IFs) was typically associated with Cryogenian glaciations and the breakup of the Rodinia supercontinent. Neoproterozoic IFs in South China are distinct, however, as they lack evidence for glacial and volcanic influence. The correlation of these IFs with Neoproterozoic sedimentary successions and their depositional environment remain controversial. Here we present new geochronological and geochemical constraints on the depositional age and environment of the Xinyu IF, one of the largest Neoproterozoic IFs in the Nanhua Basin of South China. The Xinyu IF, intercalated with clastic rocks and not in direct contact with glaciogenic sedimentary rocks, suggests deposition in an open water environment during the Sturtian glacial period. The Xiafang Formation, which hosts the Xinyu IF, overlies the diamictite-bearing Gujia Formation and underlies the gravel-containing and manganese (Mn)-bearing of the Dashajiang Formation. The youngest three zircon grains of the Xiafang Formation give a weighted mean 206Pb/238U age of 694 ± 17 Ma, representing the maximum depositional age of this formation. The Xiafang Formation is, therefore, likely correlated to the Liangjiehe Member of the Fulu Formation in the western Nanhua Basin, and was likely deposited between 694 ± 17 and 691 ± 12 Ma. Shale-normalized rare earth element (REE) plus Y (REY) patterns of the Xinyu IF samples display light REE depletion (average (LREE/HREE)SN = 0.37) relative to heavy REE, insignificant Eu anomalies (Eu* = 0.85−1.21), and no Ce anomalies (Ce* = 0.95−1.00). These geochemical characteristics suggest that the Xinyu IF was likely deposited in anoxic seawater in which Fe(II) was likely sourced from low-temperature hydrothermal fluids. Collectively, we suggest that the Xinyu IF is a Cryogenian IF deposited in open water during the Sturtian glaciation.
{"title":"Depositional age and environment of the Xinyu iron deposit in the Nanhua Basin, South China","authors":"Xiufang Wang , Hui Ye , Yuan Gao , Matthew J. Brzozowski , Xiang Li , Ru-Xiong Lei , Chang-Zhi Wu","doi":"10.1016/j.precamres.2024.107671","DOIUrl":"10.1016/j.precamres.2024.107671","url":null,"abstract":"<div><div>Deposition of Neoproterozoic iron formations (IFs) was typically associated with Cryogenian glaciations and the breakup of the Rodinia supercontinent. Neoproterozoic IFs in South China are distinct, however, as they lack evidence for glacial and volcanic influence. The correlation of these IFs with Neoproterozoic sedimentary successions and their depositional environment remain controversial. Here we present new geochronological and geochemical constraints on the depositional age and environment of the Xinyu IF, one of the largest Neoproterozoic IFs in the Nanhua Basin of South China. The Xinyu IF, intercalated with clastic rocks and not in direct contact with glaciogenic sedimentary rocks, suggests deposition in an open water environment during the Sturtian glacial period. The Xiafang Formation, which hosts the Xinyu IF, overlies the diamictite-bearing Gujia Formation and underlies the gravel-containing and manganese (Mn)-bearing of the Dashajiang Formation. The youngest three zircon grains of the Xiafang Formation give a weighted mean <sup>206</sup>Pb/<sup>238</sup>U age of 694 ± 17 Ma, representing the maximum depositional age of this formation. The Xiafang Formation is, therefore, likely correlated to the Liangjiehe Member of the Fulu Formation in the western Nanhua Basin, and was likely deposited between 694 ± 17 and 691 ± 12 Ma. Shale-normalized rare earth element (REE) plus Y (REY) patterns of the Xinyu IF samples display light REE depletion (average (LREE/HREE)<sub>SN</sub> = 0.37) relative to heavy REE, insignificant Eu anomalies (Eu* = 0.85−1.21), and no Ce anomalies (Ce* = 0.95−1.00). These geochemical characteristics suggest that the Xinyu IF was likely deposited in anoxic seawater in which Fe(II) was likely sourced from low-temperature hydrothermal fluids. Collectively, we suggest that the Xinyu IF is a Cryogenian IF deposited in open water during the Sturtian glaciation.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"417 ","pages":"Article 107671"},"PeriodicalIF":3.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143137597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-01DOI: 10.1016/j.precamres.2024.107669
Dongyang Liu , Cheng Xu , Marco Brenna , Xijun Liu , Qiuli Li , Chunwan Wei
The deep carbon cycle regulates mantle-derived magma and atmospheric CO2 on geological timescales. However, the timing of initial carbon subduction into the mantle remains debated. Here, we compare the geochemical characteristics and origin of Paleoproterozoic Zhuozi and Fengzhen carbonatite-syenite complexes within the Trans-North China Orogen. The Zhuozi syenitic zircons have an older age than the Fengzhen samples (1941 vs 1810 Ma) and show unusually high δ18O (11.8 to 13.8 ‰) compared to most Paleoproterozoic igneous zircons. Their associated carbonatites have sediment-like δ13C (−1.8 to −1.0 ‰) and δ18O (10.7 to 18.0 ‰). Both rock types at Zhuozi have high εNdt (−1.4 to 2.8) and εHft (−2.0 to 5.0) values inconsistent with wall rock contamination, in contrast with the Fengzhen complex that has lower Nd-Hf isotopes. However, in-situ Pb isotopes of feldspars in Zhuozi syenites show more radiogenic compositions than the Fengzhen samples (207Pb/204Pb = 15.21–15.38 vs 14.84–14.95, 208Pb/204Pb = 35.06–35.56 vs 34.20–34.49). The Zhuozi and Fengzhen complexes may be products of Columbian supercontinent assembly. The differences of isotopic characteristics indicate that they originated from melting of depleted mantle wedge with sediment-derived fluid metasomatism and melting of deeply subducted sediment-bearing slab, respectively. This provides direct petrological and geochemical evidence for the onset of the Earth’s deep carbon cycle before 1.9 Ga, offering new insights into the carbonatite sources and the early history of the global carbon cycle.
{"title":"Paleoproterozoic deep carbon cycle recorded in carbonatites","authors":"Dongyang Liu , Cheng Xu , Marco Brenna , Xijun Liu , Qiuli Li , Chunwan Wei","doi":"10.1016/j.precamres.2024.107669","DOIUrl":"10.1016/j.precamres.2024.107669","url":null,"abstract":"<div><div>The deep carbon cycle regulates mantle-derived magma and atmospheric CO<sub>2</sub> on geological timescales. However, the timing of initial carbon subduction into the mantle remains debated. Here, we compare the geochemical characteristics and origin of Paleoproterozoic Zhuozi and Fengzhen carbonatite-syenite complexes within the Trans-North China Orogen. The Zhuozi syenitic zircons have an older age than the Fengzhen samples (1941 vs 1810 Ma) and show unusually high δ<sup>18</sup>O (11.8 to 13.8 ‰) compared to most Paleoproterozoic igneous zircons. Their associated carbonatites have sediment-like δ<sup>13</sup>C (−1.8 to −1.0 ‰) and δ<sup>18</sup>O (10.7 to 18.0 ‰). Both rock types at Zhuozi have high εNd<sub>t</sub> (−1.4 to 2.8) and εHf<sub>t</sub> (−2.0 to 5.0) values inconsistent with wall rock contamination, in contrast with the Fengzhen complex that has lower Nd-Hf isotopes. However, in-situ Pb isotopes of feldspars in Zhuozi syenites show more radiogenic compositions than the Fengzhen samples (<sup>207</sup>Pb/<sup>204</sup>Pb = 15.21–15.38 vs 14.84–14.95, <sup>208</sup>Pb/<sup>204</sup>Pb = 35.06–35.56 vs 34.20–34.49). The Zhuozi and Fengzhen complexes may be products of Columbian supercontinent assembly. The differences of isotopic characteristics indicate that they originated from melting of depleted mantle wedge with sediment-derived fluid metasomatism and melting of deeply subducted sediment-bearing slab, respectively. This provides direct petrological and geochemical evidence for the onset of the Earth’s deep carbon cycle before 1.9 Ga, offering new insights into the carbonatite sources and the early history of the global carbon cycle.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"417 ","pages":"Article 107669"},"PeriodicalIF":3.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143137498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-01DOI: 10.1016/j.precamres.2024.107659
Guozheng Sun , Shuwen Liu , Sanzhong Li , Timothy M. Kusky , Fangyang Hu , Han Bao , Lei Gao , Yalu Hu , Shengyao Yu , Liming Dai , Lintao Wang , Xi Wang
Identification and detailed studies of ancient orogens are one of the most important scientific problems for understanding the formation and evolution of early continental crust. However, it is tough to identify the original architecture of ancient orogenic belts due to the strong disturbances of late tectonothermal events, which makes it hard to reconstruct the formation mechanism and evolution process of early microplates. Here we used the spatial–temporal evolution of Neoarchean tectono-magmatism to trace orogenic processes of the Neoarchean continental crust of the North China Craton. Regional investigations in lithological assemblages, structural geology, chronology, geochemistry, and isotopic characteristics suggest that the Archean crystalline basement of the Eastern Liaoning Range in the northeastern North China Craton may be divided into three tectonic zones, each with its independent tectono-thermal evolution. We suggest therefore that these are independent terranes, namely microplates. Anshan-Benxi microplate in the southwest is a ∼ 3.8 to ∼ 2.9 Ga ancient continental nucleus with abundant Neoarchean (2.54–2.49 Ga) crust-derived K2O-rich granitoids. Waitoushan-Weiziyu-Jiubing microplate in the center is mainly composed of ∼ 2.7 Ga tonalite-trondhjemite-granodiorite suite and 2.6–2.5 Ga diversified granitoids with some remnants of ancient oceanic lithosphere. Liaobei microplate in the northeast contains mainly late Neoarchean (2.57–2.52 Ga) magmatic rocks with minor Mesoarchean (∼3.1 Ga) crustal materials. We summarize the formation mechanism, essential features, and identification marks of the Archean orogenic belt, and conclude that the Eastern Liaoning Range experienced the following four stages of Neoarchean geodynamic evolution. (1) In the early Neoarchean (2.71–2.68 Ga), intra-oceanic subduction generated the ∼ 2.7 Ga island arc belt (proto-Waitoushan-Weiziyu-Jiubing microplate); (2) The 2.60–2.56 Ga warm subduction of oceanic slabs reformed proto-Liaobei microplate, and re-deformed the residual ∼ 2.7 Ga island arc belt; (3) During 2.56–2.54 Ga, the Waitoushan-Weiziyu-Jiubing microplate and Liaobei microplate were amalgamated by an ‘arc-arc’ collision; (4) At the end of Archean (2.54–2.50 Ga), the Waitoushan-Weiziyu-Jiubing microplate + Liaobei microplate and proto-Anshan-Benxi microplate were finally aggregated through the ‘arc-proto-continental’ collision, forming a unified crystalline basement of the Eastern Liaoning Range. Our work suggests that the short-term, small-scale subduction-collision orogenic cycles within pristine plate tectonic regimes played a crucial role in the Neoarchean crustal growth and evolution of the North China Craton.
{"title":"Neoarchean orogenic belt evolution in the northeast North China Craton: Implications for the reconstruction of early Earth’s microplates","authors":"Guozheng Sun , Shuwen Liu , Sanzhong Li , Timothy M. Kusky , Fangyang Hu , Han Bao , Lei Gao , Yalu Hu , Shengyao Yu , Liming Dai , Lintao Wang , Xi Wang","doi":"10.1016/j.precamres.2024.107659","DOIUrl":"10.1016/j.precamres.2024.107659","url":null,"abstract":"<div><div>Identification and detailed studies of ancient orogens are one of the most important scientific problems for understanding the formation and evolution of early continental crust. However, it is tough to identify the original architecture of ancient orogenic belts due to the strong disturbances of late tectonothermal events, which makes it hard to reconstruct the formation mechanism and evolution process of early microplates. Here we used the spatial–temporal evolution of Neoarchean tectono-magmatism to trace orogenic processes of the Neoarchean continental crust of the North China Craton. Regional investigations in lithological assemblages, structural geology, chronology, geochemistry, and isotopic characteristics suggest that the Archean crystalline basement of the Eastern Liaoning Range in the northeastern North China Craton may be divided into three tectonic zones, each with its independent tectono-thermal evolution. We suggest therefore that these are independent terranes, namely microplates. Anshan-Benxi microplate in the southwest is a ∼ 3.8 to ∼ 2.9 Ga ancient continental nucleus with abundant Neoarchean (2.54–2.49 Ga) crust-derived K<sub>2</sub>O-rich granitoids. Waitoushan-Weiziyu-Jiubing microplate in the center is mainly composed of ∼ 2.7 Ga tonalite-trondhjemite-granodiorite suite and 2.6–2.5 Ga diversified granitoids with some remnants of ancient oceanic lithosphere. Liaobei microplate in the northeast contains mainly late Neoarchean (2.57–2.52 Ga) magmatic rocks with minor Mesoarchean (∼3.1 Ga) crustal materials. We summarize the formation mechanism, essential features, and identification marks of the Archean orogenic belt, and conclude that the Eastern Liaoning Range experienced the following four stages of Neoarchean geodynamic evolution. (1) In the early Neoarchean (2.71–2.68 Ga), intra-oceanic subduction generated the ∼ 2.7 Ga island arc belt (proto-Waitoushan-Weiziyu-Jiubing microplate); (2) The 2.60–2.56 Ga warm subduction of oceanic slabs reformed proto-Liaobei microplate, and re-deformed the residual ∼ 2.7 Ga island arc belt; (3) During 2.56–2.54 Ga, the Waitoushan-Weiziyu-Jiubing microplate and Liaobei microplate were amalgamated by an ‘arc-arc’ collision; (4) At the end of Archean (2.54–2.50 Ga), the Waitoushan-Weiziyu-Jiubing microplate + Liaobei microplate and proto-Anshan-Benxi microplate were finally aggregated through the ‘arc-proto-continental’ collision, forming a unified crystalline basement of the Eastern Liaoning Range. Our work suggests that the short-term, small-scale subduction-collision orogenic cycles within pristine plate tectonic regimes played a crucial role in the Neoarchean crustal growth and evolution of the North China Craton.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"417 ","pages":"Article 107659"},"PeriodicalIF":3.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143137579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-01DOI: 10.1016/j.precamres.2024.107668
Chen Zhao , Jin Liu , Hongxiang Zhang , Chao Zhang , Jingsheng Chen , Dandan Cui , Jirui Zhang
Continental nuclei provide essential genetic insights into the formation and evolution of the continental crust during the early Archean. This study reported the discovery of a ∼3.53 Ga trondhjemite from the newly identified Eoarchean–Paleoarchean Labashan Complex, located within the Eastern Hebei continental nucleus of the North China Craton (NCC). This study conducted comprehensive analyses, including zircon geochronology, zircon Hf isotopes, and whole-rock geochemistry, on this ancient rock. Zircon U-Pb dating revealed a crystallization age of 3533 ± 27 Ma. The trondhjemite displays characteristics typical of low-pressure types, such as low Sr/Y (7.5–12.8), (La/Yb)N (9.2–19.2), and (Gd/Yb)N (1.1–2.0) ratios, along with slight negative Eu anomalies (0.54–0.86). Most zircons exhibit unradiogenic Hf isotopes, with negative εHf(t) values as low as −7.0 and TDM2 ages ranging from 4501 to 3606 Ma. These results suggest that the parental magma of the ∼3.53 Ga trondhjemite likely originated from the partial melting of Hadean to early Eoarchean hydrated mafic protocrust, and formed at shallow depths with a residue enriched in amphibole and plagioclase. Our findings, alongside previous research, indicate that the NCC possesses a Hadean crustal evolutionary history, positioning it as one of Earth’s oldest fragments. We propose that the formation of the NCC’s continental nuclei, including the Eastern Hebei region, involved multiple stages of crustal reworking and recycling, with minor contributions from juvenile mantle-derived materials before the early Neoarchean. The most plausible mechanism for this evolution is the activity of mantle plumes beneath a stagnant lid.
{"title":"Low-pressure ∼3.53 Ga trondhjemite in the Eastern Hebei: Implications on the continental nucleus formation of the North China Craton","authors":"Chen Zhao , Jin Liu , Hongxiang Zhang , Chao Zhang , Jingsheng Chen , Dandan Cui , Jirui Zhang","doi":"10.1016/j.precamres.2024.107668","DOIUrl":"10.1016/j.precamres.2024.107668","url":null,"abstract":"<div><div>Continental nuclei provide essential genetic insights into the formation and evolution of the continental crust during the early Archean. This study reported the discovery of a ∼3.53 Ga trondhjemite from the newly identified Eoarchean–Paleoarchean Labashan Complex, located within the Eastern Hebei continental nucleus of the North China Craton (NCC). This study conducted comprehensive analyses, including zircon geochronology, zircon Hf isotopes, and whole-rock geochemistry, on this ancient rock. Zircon U-Pb dating revealed a crystallization age of 3533 ± 27 Ma. The trondhjemite displays characteristics typical of low-pressure types, such as low Sr/Y (7.5–12.8), (La/Yb)<sub>N</sub> (9.2–19.2), and (Gd/Yb)<sub>N</sub> (1.1–2.0) ratios, along with slight negative Eu anomalies (0.54–0.86). Most zircons exhibit unradiogenic Hf isotopes, with negative ε<sub>Hf(</sub><em><sub>t</sub></em><sub>)</sub> values as low as −7.0 and T<sub>DM</sub><sup>2</sup> ages ranging from 4501 to 3606 Ma. These results suggest that the parental magma of the ∼3.53 Ga trondhjemite likely originated from the partial melting of Hadean to early Eoarchean hydrated mafic protocrust, and formed at shallow depths with a residue enriched in amphibole and plagioclase. Our findings, alongside previous research, indicate that the NCC possesses a Hadean crustal evolutionary history, positioning it as one of Earth’s oldest fragments. We propose that the formation of the NCC’s continental nuclei, including the Eastern Hebei region, involved multiple stages of crustal reworking and recycling, with minor contributions from juvenile mantle-derived materials before the early Neoarchean. The most plausible mechanism for this evolution is the activity of mantle plumes beneath a stagnant lid.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"417 ","pages":"Article 107668"},"PeriodicalIF":3.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143137580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-01DOI: 10.1016/j.precamres.2025.107706
Jade Lockie , Alessandro Ielpi , Rebecca Canam , Morgann G. Perrot , Joshua H.F.L. Davies , Luke Ootes
The investigation of sedimentary successions broadly contemporaneous with supercontinent amalgamation is critical to understand sediment dispersal in response to collisional tectonics. The Paleoproterozoic Great Slave Supergroup of the East Arm basin is one of three sedimentary successions located along the margins of the Archean Slave craton. U-Pb detrital zircon geochronology with chemical-abrasion laser-ablation inductively-coupled plasma mass spectrometry is employed here to investigate the onset of sedimentation, provenance, and regional correlations of the Sosan Group (the Great Slave Supergroup’s basal succession). Although a detrital age signature of the Slave craton is found in the < 1.97–1.95 Ga Hornby Channel Formation (lowermost Sosan Group) – the dominant component through the strata has a distinct ∼ 2.0–1.97 Ga detrital age population, suggesting that the Sosan Group sediments were derived from the collapsing Thelon-Taltson orogenic topography. Data presented herein support novel correlations in the region, specifically between the East Arm basin and the nearby Kilohigok basin, Coronation margin and Hottah terrane. By these means, this study highlights the importance of stratigraphically complete geochronological analyses to propose regional correlations.
{"title":"Orogenic unroofing of the Taltson and Thelon orogens depicted through detrital zircon geochronology of the Sosan Group, Great Slave Lake Supergroup (Northwest Territories, Canada)","authors":"Jade Lockie , Alessandro Ielpi , Rebecca Canam , Morgann G. Perrot , Joshua H.F.L. Davies , Luke Ootes","doi":"10.1016/j.precamres.2025.107706","DOIUrl":"10.1016/j.precamres.2025.107706","url":null,"abstract":"<div><div>The investigation of sedimentary successions broadly contemporaneous with supercontinent amalgamation is critical to understand sediment dispersal in response to collisional tectonics. The Paleoproterozoic Great Slave Supergroup of the East Arm basin is one of three sedimentary successions located along the margins of the Archean Slave craton. U-Pb detrital zircon geochronology with chemical-abrasion laser-ablation inductively-coupled plasma mass spectrometry is employed here to investigate the onset of sedimentation, provenance, and regional correlations of the Sosan Group (the Great Slave Supergroup’s basal succession). Although a detrital age signature of the Slave craton is found in the < 1.97–1.95 Ga Hornby Channel Formation (lowermost Sosan Group) – the dominant component through the strata has a distinct ∼ 2.0–1.97 Ga detrital age population, suggesting that the Sosan Group sediments were derived from the collapsing Thelon-Taltson orogenic topography. Data presented herein support novel correlations in the region, specifically between the East Arm basin and the nearby Kilohigok basin, Coronation margin and Hottah terrane. By these means, this study highlights the importance of stratigraphically complete geochronological analyses to propose regional correlations.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"419 ","pages":"Article 107706"},"PeriodicalIF":3.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143096739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-01DOI: 10.1016/j.precamres.2024.107617
R.G. Berman, W.J. Davis, M. Sanborn-Barrie
Queen Maud block (QMb) is re-defined as an area of dominantly Mesoarchean crust forming the northwestern part of the Rae craton. Four U-Pb zircon age determinations (ca. 3.3–2.97 Ga) extend QMb ∼40 km farther west than previously known to a major tectonic boundary marked by a >450 km-long belt of ca. 1.9 Ga peraluminous leucogranite in the Thelon tectonic zone. Crust older than 3.3 Ga is indicated by inherited zircon up to 3.95 Ga in one sample. The absence within QMb of 2.6 Ga plutonic rocks, a dominant component of the central Rae craton, suggests distinct Neoarchean tectonic histories and separation of these crustal blocks prior to accretion of ca. 2.56–2.51 Ga Boothia terrane, stitching by ca. 2.5 Ga Queen Maud granitoids and a shared post-2.5 Ga history.
Tonalite dated at 2.41 Ga in QMb and monzogranite dated at 2.34 Ga in the adjacent Thelon tectonic zone have geochemical characteristics of convergent plate margin magmatism (arc ± slab-failure). Similarity in the Nd isotopic compositions of 2.34 Ga Thelon monzogranite and ca. 2.3 Ga plutonic rocks in Buffalo Head terrane, as well as 2.07 Ga and 2.0 Ga plutonic rocks in both regions point to a similar Neoarchean basement component. This basement terrane is proposed to have collided with the Rae at ca. 2.41 Ga and driven ca. 2.4–2.3 Ga tectonometamorphism during the Arrowsmith Orogeny.
The western Rae represented a convergent margin at 2.41–2.3 Ga and potentially 2.6–2.5 Ga, the latter broadly synchronous with the MacQuoid orogeny on the southeastern Rae margin. Throughout this time period, the central Rae craton was in an upper-plate position. Sustained mantle downwelling driving plate convergence towards the central Rae craton, as previously recognized at 2.0–1.9 Ga, was maintained from the Neoarchean through multiple Paleoproterozic orogenies (Arrowsmith, Taltson-Thelon and Hudsonian), establishing the Rae craton as the nucleus of proto-Laurentia within the Nuna supercontinent.
{"title":"Isotopic constraints on the architecture and early (ca. 2.4–2.3 Ga) Paleoproterozoic evolution of the northwestern Rae craton, Canada","authors":"R.G. Berman, W.J. Davis, M. Sanborn-Barrie","doi":"10.1016/j.precamres.2024.107617","DOIUrl":"10.1016/j.precamres.2024.107617","url":null,"abstract":"<div><div>Queen Maud block (QMb) is re-defined as an area of dominantly Mesoarchean crust forming the northwestern part of the Rae craton. Four U-Pb zircon age determinations (ca. 3.3–2.97 Ga) extend QMb ∼40 km farther west than previously known to a major tectonic boundary marked by a >450 km-long belt of ca. 1.9 Ga peraluminous leucogranite in the Thelon tectonic zone. Crust older than 3.3 Ga is indicated by inherited zircon up to 3.95 Ga in one sample. The absence within QMb of 2.6 Ga plutonic rocks, a dominant component of the central Rae craton, suggests distinct Neoarchean tectonic histories and separation of these crustal blocks prior to accretion of ca. 2.56–2.51 Ga Boothia terrane, stitching by ca. 2.5 Ga Queen Maud granitoids and a shared post-2.5 Ga history.</div><div>Tonalite dated at 2.41 Ga in QMb and monzogranite dated at 2.34 Ga in the adjacent Thelon tectonic zone have geochemical characteristics of convergent plate margin magmatism (arc ± slab-failure). Similarity in the Nd isotopic compositions of 2.34 Ga Thelon monzogranite and ca. 2.3 Ga plutonic rocks in Buffalo Head terrane, as well as 2.07 Ga and 2.0 Ga plutonic rocks in both regions point to a similar Neoarchean basement component. This basement terrane is proposed to have collided with the Rae at ca. 2.41 Ga and driven ca. 2.4–2.3 Ga tectonometamorphism during the Arrowsmith Orogeny.</div><div>The western Rae represented a convergent margin at 2.41–2.3 Ga and potentially 2.6–2.5 Ga, the latter broadly synchronous with the MacQuoid orogeny on the southeastern Rae margin. Throughout this time period, the central Rae craton was in an upper-plate position. Sustained mantle downwelling driving plate convergence towards the central Rae craton, as previously recognized at 2.0–1.9 Ga, was maintained from the Neoarchean through multiple Paleoproterozic orogenies (Arrowsmith, Taltson-Thelon and Hudsonian), establishing the Rae craton as the nucleus of proto-Laurentia within the Nuna supercontinent.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"417 ","pages":"Article 107617"},"PeriodicalIF":3.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143137503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-01DOI: 10.1016/j.precamres.2024.107667
Qiyu Wang , Zhengjiang Wang , Jiahong Liu , Qi Deng , Hao Liu , Zhiwu Li , Gang Zhou , Shuangjian Li , Guoqing Xiong , Yu Xia , Long Ma
The northwestern (NW) Yangtze craton during the Ediacaran–Cambrian period has been considered a passive continental margin; however, there remains contention regarding the timing and mechanisms of the initiation and evolution of the Mianyang–Changning cratonic rift (MCCR) within the NW Yangtze craton. In this study, we present the depositional sequences and detrital zircon geochronology from seven representative sections of the Ediacaran and Early Cambrian strata in the NW Yangtze craton to determine the onset time and evolution processes of this cratonic rift, along with its tectonic and sedimentary responses. Results indicate that multiple tectonic–sedimentary transitions occurred during the Ediacaran–Cambrian, accompanied by fluctuations in sea level and episodic uplift and erosion of carbonate platforms. Furthermore, the provenance of detrital zircon from the Ediacaran and lower Cambrian reveals substantial regional diversity in the Ediacaran, similarity and poly-cyclicity in the Early Cambrian, and temporal variability between the Ediacaran and Early Cambrian. Meanwhile, the summary plot of the detrital zircons from the Ediacaran and Early Cambrian strata indicates that their native basin is characterized neither by an extensional setting nor by a convergent setting, but rather by a collision background. Based on these depositional sequences and detrital zircon age spectra, and combined with previous studies, we conclude that the onset, expansion, filling, and uplift of the MCCR in the NW Yangtze craton during the Ediacaran to Early Cambrian be resulted from peripheral accretionary orogeny associated with the assembly of Gondwana, rather than a continuation of the breakup of Rodinia.
{"title":"Depositional sequence and detrital zircon age spectra from Ediacaran to Early Cambrian at the northwestern Yangtze craton: Implication for the basin dynamics","authors":"Qiyu Wang , Zhengjiang Wang , Jiahong Liu , Qi Deng , Hao Liu , Zhiwu Li , Gang Zhou , Shuangjian Li , Guoqing Xiong , Yu Xia , Long Ma","doi":"10.1016/j.precamres.2024.107667","DOIUrl":"10.1016/j.precamres.2024.107667","url":null,"abstract":"<div><div>The northwestern (NW) Yangtze craton during the Ediacaran–Cambrian period has been considered a passive continental margin; however, there remains contention regarding the timing and mechanisms of the initiation and evolution of the Mianyang–Changning cratonic rift (MCCR) within the NW Yangtze craton. In this study, we present the depositional sequences and detrital zircon geochronology from seven representative sections of the Ediacaran and Early Cambrian strata in the NW Yangtze craton to determine the onset time and evolution processes of this cratonic rift, along with its tectonic and sedimentary responses. Results indicate that multiple tectonic–sedimentary transitions occurred during the Ediacaran–Cambrian, accompanied by fluctuations in sea level and episodic uplift and erosion of carbonate platforms. Furthermore, the provenance of detrital zircon from the Ediacaran and lower Cambrian reveals substantial regional diversity in the Ediacaran, similarity and poly-cyclicity in the Early Cambrian, and temporal variability between the Ediacaran and Early Cambrian. Meanwhile, the summary plot of the detrital zircons from the Ediacaran and Early Cambrian strata indicates that their native basin is characterized neither by an extensional setting nor by a convergent setting, but rather by a collision background. Based on these depositional sequences and detrital zircon age spectra, and combined with previous studies, we conclude that the onset, expansion, filling, and uplift of the MCCR in the NW Yangtze craton during the Ediacaran to Early Cambrian be resulted from peripheral accretionary orogeny associated with the assembly of Gondwana, rather than a continuation of the breakup of Rodinia.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"417 ","pages":"Article 107667"},"PeriodicalIF":3.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143137434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-01DOI: 10.1016/j.precamres.2024.107661
Arunava Sen , Soumik Mukhopadhyay , Eva E. Stüeken , Pradip Samanta , Subir Sarkar , Soumyadeep Bose , Shailesh Agarwal , Anurag Kumar
Indian Neoproterozoic successions offer unique insights into global paleoclimatic and biogeochemical transitions. This study presents a detailed sedimentological and geochemical analysis of marine siliciclastic sedimentary rocks from the Cave-Temple Arenite Member of the Kerur Formation, the lowermost formation of the Badami Basin within the Dharwar Craton of the South Indian Shield. Geochronological constraints on overlying carbonate rocks from the Konkankoppa Limestone Member of the uppermost Katageri Formation provide a post-Cryogenian to mid-Ediacaran age of 604 ± 25 (1σ) Ma for the upper limit of marine sedimentation. Sedimentological and geochemical proxies, accompanied with previous geochronological and provenance studies, indicate a rift-related intracratonic basin influenced by tectonic processes associated with the Rodinia supercontinent breakup. Provenance studies reveal sediment contributions predominantly from the Archaean to Mesoproterozoic quartzofeldspathic sources. Marine intervals exhibit distinct stratification, with oxic, brackish to mildly saline shallow waters transitioning to anoxic-euxinic, more saline deeper waters. These conditions emerged above a fluvio-alluvial cycle formed during cold, arid climatic conditions. However, CIA (Chemical Index of Alteration) values suggest subsequent warmer, humid climates during the transgression and evolution of the marine interval. This scenario of climate change and marine transgression likely reflects a global climatic shift during one of the two potential hothouse phases, depending on the estimated minimum and maximum depositional ages spanning approximately from 629 to 579 Ma. These ages correspond either to the post-Marinoan or the post-Gaskiers glaciations, both characterized by intense chemical weathering, high nutrient influx, and enhanced productivity along deeper marine shelves. The studied succession, marked by the absence of glacial deposits and a stratified non-frozen marine setting supposedly situated at mid- to low latitudes, offers evidence for a unique paleoenvironment that harboured active biogeochemical cycles amidst evolving climatic conditions.
{"title":"Evolving marine sedimentation, redox stratification, and biogeochemical cycling in mid- to low-latitudinal non-frozen waters during late Neoproterozoic global-scale climatic transitions","authors":"Arunava Sen , Soumik Mukhopadhyay , Eva E. Stüeken , Pradip Samanta , Subir Sarkar , Soumyadeep Bose , Shailesh Agarwal , Anurag Kumar","doi":"10.1016/j.precamres.2024.107661","DOIUrl":"10.1016/j.precamres.2024.107661","url":null,"abstract":"<div><div>Indian Neoproterozoic successions offer unique insights into global paleoclimatic and biogeochemical transitions. This study presents a detailed sedimentological and geochemical analysis of marine siliciclastic sedimentary rocks from the Cave-Temple Arenite Member of the Kerur Formation, the lowermost formation of the Badami Basin within the Dharwar Craton of the South Indian Shield. Geochronological constraints on overlying carbonate rocks from the Konkankoppa Limestone Member of the uppermost Katageri Formation provide a post-Cryogenian to mid-Ediacaran age of 604 ± 25 (1σ) Ma for the upper limit of marine sedimentation. Sedimentological and geochemical proxies, accompanied with previous geochronological and provenance studies, indicate a rift-related intracratonic basin influenced by tectonic processes associated with the Rodinia supercontinent breakup. Provenance studies reveal sediment contributions predominantly from the Archaean to Mesoproterozoic quartzofeldspathic sources. Marine intervals exhibit distinct stratification, with oxic, brackish to mildly saline shallow waters transitioning to anoxic-euxinic, more saline deeper waters. These conditions emerged above a fluvio-alluvial cycle formed during cold, arid climatic conditions. However, CIA (Chemical Index of Alteration) values suggest subsequent warmer, humid climates during the transgression and evolution of the marine interval. This scenario of climate change and marine transgression likely reflects a global climatic shift during one of the two potential hothouse phases, depending on the estimated minimum and maximum depositional ages spanning approximately from 629 to 579 Ma. These ages correspond either to the post-Marinoan or the post-Gaskiers glaciations, both characterized by intense chemical weathering, high nutrient influx, and enhanced productivity along deeper marine shelves. The studied succession, marked by the absence of glacial deposits and a stratified non-frozen marine setting supposedly situated at mid- to low latitudes, offers evidence for a unique paleoenvironment that harboured active biogeochemical cycles amidst evolving climatic conditions.</div></div>","PeriodicalId":49674,"journal":{"name":"Precambrian Research","volume":"417 ","pages":"Article 107661"},"PeriodicalIF":3.2,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143137435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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