Journal of Asian Earth Sciences最新文献

{"title":"Provenance of Silurian sandstones in the South Kunlun terrane, West Kunlun (NW China) and the timing of the closure of the early Paleozoic Kudi-Qimanyute Ocean","authors":"Jie Zhang ,&nbsp;Yajun Xu ,&nbsp;Yiming Zhang ,&nbsp;Huxiang Yang ,&nbsp;Zihao Huang ,&nbsp;Kai Cao ,&nbsp;Xuguang Sha ,&nbsp;Xin Li ,&nbsp;Guocan Wang","doi":"10.1016/j.jseaes.2025.106527","DOIUrl":"10.1016/j.jseaes.2025.106527","url":null,"abstract":"<div><div>The West Kunlun Orogenic Belt (WKOB) records the early Palaeozoic subduction and accretion events related to the Proto-Tethys Ocean along the southwestern margin of the Tarim Block. The branch of the Proto-Tethys Ocean in the West Kunlun region is known as the Kudi-Qimanyute Ocean, whose consumption and closure have resulted in the collision between the North Kunlun terrane (NKT) and the South Kunlun terrane (SKT). However, the age and process of ocean closure have been widely debated. In this study, we present new U-Pb ages and Hf isotope data of detrital zircon and monazite from the Silurian sandstones at the northern margin of the SKT, which reveals a significant shift of sedimentary provenance, indicative of the transition in tectonic setting from a continental forearc to a collisional foreland basin. Provenance analysis indicates that detrital zircon age spectrum from the lower part of the sampled section shows an unimodal pattern and is dominated by early Paleozoic zircon grains derived from the SKT and the Tianshuihai Terrane (TSHT) magmatic arcs. In contrast, the ages of detrital zircons from the sample in the middle part of the section range from Neoproterozoic to Archean with prominent peaks at around 1.1 Ga, 1.4 Ga, and 1.6–1.8 Ga, which are interpreted to be recycled from older (meta)sedimentary rocks in the SKT and TSHT. This change reflects the burial of the magmatic arc beneath a prograding wedge of detritus, sourced from the advancing TSHT and SKT, as a result of the continental collision. Based on the depositional age of the Qaite Formation constrained by the youngest detrital monazite, as well as post-orogenic magmatism and sedimentary records in the region, the closure of the Kudi-Qimanyute Ocean can be constrained to the middle-late Silurian period (427–420 Ma). The detritus in the upper part of the section consists of varying amounts of early Paleozoic and Precambrian grains. The reappearance of late Neoproterozoic to early Paleozoic components is attributed to the re-exposure of the early arc rocks in the SKT and the TSHT during the collisional process. The abundant Archean to Mesoproterozoic detritus in the studied samples reflects the age and composition of the Precambrian basement of the SKT and TSHT. A comprehensive comparison of Precambrian detrital zircon U-Pb and Hf isotopic data indicates that SKT and TSHT share a basement affinity with Western Laurentia, suggesting they were likely part of Western Laurentia within the Rodinian supercontinent.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"281 ","pages":"Article 106527"},"PeriodicalIF":2.7,"publicationDate":"2025-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical simulation of pre-seismic and coseismic continuous response of water level to the 2014 Ludian MS6.5 earthquake: A case study of Huize well","authors":"Huimin Kong ,&nbsp;Hongbiao Gu ,&nbsp;Haibin Wei","doi":"10.1016/j.jseaes.2025.106523","DOIUrl":"10.1016/j.jseaes.2025.106523","url":null,"abstract":"<div><div>Groundwater is sensitive to seismic and tectonic activity. Continuous response of well water levels pre-seismic and coseismic provides further evidence for the relationship between seismic activity and changes in water level. However, quantitatively analyzing factors such as crustal stress variations, aquifer deformation, pore pressure changes, and dynamic fluctuations in well water levels from seismogenesis to seismic rupture presents challenges due to their complex nature. Additionally, research on pre-seismic and coseismic response has been separated temporally due to different physical mechanisms and research objectives. In this study, pre-seismic and coseismic response are considered as continuous processes that involve a series of physical phenomena including stress–strain-pore pressure-water level changes before and during an earthquake event. This study aims to establish quantitative relationships between these response processes and hydrogeological parameters, as well as rock mechanical properties, thereby revealing the underlying physical mechanisms governing the continuous pre- and coseismic response of well water levels. A mathematical and numerical model was developed to continuously analyze the pre- and coseismic response of well water levels based on hydraulic-mechanical coupling near fault sections using near-field earthquakes under static stress as a case study. To validate the effectiveness of the numerical model, a simulation was conducted to replicate the continuous pre- and coseismic response of Huize well water levels during the Ludian earthquake. Through the design, identification, and correction of various parameter schemes, the simulated values align closely with measured water levels for both pre- and coseismic periods. This research holds significant practical implications for earthquake monitoring.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"281 ","pages":"Article 106523"},"PeriodicalIF":2.7,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143395487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Petrogenesis of Mesoproterozoic kimberlites in the Chigicherla region, Eastern Dharwar craton, Southern India: Insights into the origin of small-volume, enriched-mantle derived melts and link to subduction and supercontinent cycle","authors":"Hero Kalra ,&nbsp;Ashish Dongre ,&nbsp;Fanus Viljoen ,&nbsp;Qiu-Li Li","doi":"10.1016/j.jseaes.2025.106508","DOIUrl":"10.1016/j.jseaes.2025.106508","url":null,"abstract":"<div><div>We present new mineralogical, elemental and U-Pb perovskite age data for diamondiferous intrusions from Chigicherla kimberlite cluster of the Eastern Dharwar craton (EDC) in southern India. These rocks display inequigranular textures and contain macrocrysts, and segregations of solidified melts which are interpreted to be magmaclasts. Mineralogical studies indicate that intrusions CC-1 and CC-2 show a similarity to Kaapvaal lamproites, while the other three intrusions (CC-3, CC-4, and CC-5) display characteristics indicative of true kimberlite nature. The whole rock major and trace element geochemistry, involving large-ion lithophile and high-field strength elements, supports this observation. The geochemical signatures resembling Ocean Island Basalts (OIB) and metasomatism of source regions by fluids/melts emanating from deep-sourced upwelling mantle are consistent across the Chigicherla intrusions, mirroring other kimberlite intrusions within the EDC. Perovskite dating revealed a ²⁰⁶Pb/²³⁸U age of 1110 ± 9.5 Ma for the CC-1 pipe and 1116 ± 14 Ma for the CC-3 pipe.</div><div>This new data enables us to study the genesis of the Chigicherla intrusions specifically and to propose a new geodynamic model for the eruption of kimberlites and lamproites in southern India in general. The eruptions of predominantly kimberlites between 1055 and 1153 Ma and lamproites between 1300 and 1400 Ma are attributed to processes such as prolonged subduction, lithospheric extension, and mantle return flow, considering the plate tectonic evolution of the EDC during the Mesoproterozoic.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"281 ","pages":"Article 106508"},"PeriodicalIF":2.7,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143378783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Constraints of clay mineral assemblages on the provenance of sediments in the northern East China Sea with implications for the tectonic activities","authors":"Zhigeng Huang ,&nbsp;Yonghang Xu ,&nbsp;Liang Yi ,&nbsp;Dongyi Li ,&nbsp;Jian Chen","doi":"10.1016/j.jseaes.2025.106512","DOIUrl":"10.1016/j.jseaes.2025.106512","url":null,"abstract":"<div><div>The Zhe-Min Uplift (ZMU) has significantly impacted the geomorphology of eastern China. Due to the geographic barrier created by the ZMU, the transport pathway of sediments from the paleo-Yangtze River to the East China Sea remains unclear. This study presents a high-resolution clay mineralogy analysis of a borehole (ECS-DZ1, 153.6 m) within the ZMU to investigate sediment provenance and paleoenvironmental changes in the northern East China Sea. In the Early Pleistocene, the clay minerals of marine sediments were predominantly illite, with notable contents of smectite (24 %) and kaolinite (12 %), primarily sourced from proximal sources such as the Bailonggang basalt and the Qiantang River. However, with ongoing tectonic subsidence, sediments from the paleo-Yangtze River began to influence the study area during the Early-Middle Pleistocene, leading to a decrease in kaolinite content (6 %). In the terrestrial deposits of core ECS-DZ1, illite is the dominant mineral (68 %), with relatively high kaolinite (12 %) and the absence of smectite, indicating that sediments were primarily derived from the Qiantang River. During the Holocene sea-level highstand, over 50 m of marine sediments accumulated in the Yangtze River estuary, with clay mineral assemblages from this period matching those of the Yangtze River, confirming it as the primary source. The sediment provenance of the East China Sea continental shelf is influenced by the complex interplay of global sea-level fluctuations and tectonic activity.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"281 ","pages":"Article 106512"},"PeriodicalIF":2.7,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143372205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microbial characteristics and CO2 diffuse emission in the Mt. Changbai volcanic field, northeast China","authors":"Yutao Sun ,&nbsp;Xingxing Li ,&nbsp;Zhengfu Guo ,&nbsp;Wenbin Zhao ,&nbsp;Yue Zhang ,&nbsp;Peizhan Li ,&nbsp;Xiaoyong Zhao ,&nbsp;Yaru Li ,&nbsp;Bin Hong","doi":"10.1016/j.jseaes.2025.106513","DOIUrl":"10.1016/j.jseaes.2025.106513","url":null,"abstract":"<div><div>Volcanism is one of the principal geologic processes that drive the transferring of carbon between interior and surface reservoirs, playing a crucial role in climate change and global warming. Clarifying the relationship between the characteristics of microorganisms and geological degassing of dormant volcanoes is one of the most important and fundamental tasks. In this study, the microbial characteristics (including bacteria, archaea, and fungi) of cold and hot springs and soil in the Tianchi volcano (TCV), northeastern China were comprehensively studied. Results of this study indicated that the microbial diversities of water environments (hot and cold springs) exhibited distinct characteristics compared to that of the soil, inferring that the microbial-driven carbon cycle in wet and dry degassing systems in the TCV are different. The CO₂ diffuse emission flux from the soil through micro-seepage decreased from the crater to the peripheral area, which broadly coincided with the diversity and richness of the microbial community. A moderate but significant correlation was found between soil CO₂ flux and microbial diversity of bacteria, archaea and fungi, differing from that observed in extreme volcanic environments and non-volcanic fields. This study is the first to report the correlation between microbial community diversity and soil CO₂ flux in a non-extreme volcanic environment. The findings reveal the diversity of microorganisms involved in the carbon cycle, which may provide a foundation for further in-depth exploration of the intrinsic microbial mechanisms in the carbon cycle.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"281 ","pages":"Article 106513"},"PeriodicalIF":2.7,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143358055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Earthquake-induced permeability and hydrochemical variation in an aquifer–aquitard system","authors":"Xiaobo Feng,&nbsp;Zhihua Zhou","doi":"10.1016/j.jseaes.2025.106514","DOIUrl":"10.1016/j.jseaes.2025.106514","url":null,"abstract":"<div><div>Groundwater level, permeability, and chemical components can be affected by earthquakes; however, there are few comprehensive investigations utilizing long-term continuous hydrological monitoring data covering multiple strong earthquakes. In this study, a continuous 2-year dataset of groundwater levels and chemical composition (Ca²⁺, Mg²⁺, HCO₃⁻) from well #32 in the Xichang area of Sichuan Province, China, was used to analyze changes in earthquake-induced hydrological processes within an aquifer–aquitard system. Co-seismic changes in groundwater level and ion concentrations were associated with the Yangbi <em>M</em>_W 6.1 and Luding <em>M</em>_W 6.6 earthquakes. Horizontal and vertical permeability, estimated using the tidal response model, decreased during both earthquakes, possibly owing to dynamic strain resulting from seismic waves. In addition, there were significant correlations between vertical permeability and ion concentrations, with ion fluctuations during earthquake periods possibly associated with reduced mixing of different groundwater sources owing to the decrease in permeability. The results of this study provide new insight into the role of earthquakes in dynamic hydrological processes.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"281 ","pages":"Article 106514"},"PeriodicalIF":2.7,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143358054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydrogeochemical characteristics of hot springs in the Longriba fault, northeastern Tibetan Plateau: Tectonic implications for geothermal fluid circulation","authors":"Yuwen Wang ,&nbsp;Xiaocheng Zhou ,&nbsp;Jingchao Li ,&nbsp;Yunfei Bai ,&nbsp;Yucong Yan ,&nbsp;Jiao Tian ,&nbsp;Miao He ,&nbsp;Zhaojun Zeng ,&nbsp;Bingyu Yao ,&nbsp;Gaoyuan Xing ,&nbsp;Shihan Cui ,&nbsp;Ying Li ,&nbsp;Liwu Li","doi":"10.1016/j.jseaes.2025.106511","DOIUrl":"10.1016/j.jseaes.2025.106511","url":null,"abstract":"<div><div>The Longriba fault (LRBF) is in the seismically active northeastern Tibetan Plateau, yet the tectonic dynamics at the fault remain controversial. Furthermore, no studies have provided insights into tectonic activity through geothermal fluid circulation in the LRBF. In this study, we investigated 20 hot springs in the LRBF to get a better understanding of the processes and control factors between fluid circulation and tectonic activity. Hydrogeochemical results indicate that the hot springs in the study area are predominantly recharged by atmospheric precipitation and can be classified into two groups based on their hydrochemical types. Group I was a typical HCO₃-Ca, including some HCO₃-Ca⋅Mg, HCO₃-Mg, and HCO₃-Na⋅Ca. Group II hot springs, classified as HCO₃-Na type, have high reservoir temperatures (average 94 °C), suggesting dominant reactions with silicates during deep circulation. Meanwhile, the hydrogen, oxygen, and strontium isotopes of water in the two groups also show significant differences. In addition, the Group II hot springs are all located in the southwest segment of the study area, and their gases have higher ³He/⁴He ratios (Rc/Ra ratios up to 0.43 Ra). Hydrogeochemical results, combined with geological and geophysical data, suggest that differences in recharge elevation, granite distribution, and potential lower crustal flow or partial melting contributed to the distinct hydrogeochemical characteristics of the two groups. Moreover, we supposed that the spatial distribution of ³He/⁴He implies a lower crustal flow and partial melting beneath the LRBF. One possible explanation is the presence of a lower crustal flow tributary beneath the LRBF. In the LRBF, hydrothermal circulation and deep tectonics are likely key factors in generating high-frequency earthquakes. The above results provide insights into regional tectonic activity through the hydrogeochemical characteristics of hot springs.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"281 ","pages":"Article 106511"},"PeriodicalIF":2.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Active tectonics and kinematic architecture of intraplate strike-slip fault: Savrun fault zone, SE Türkiye","authors":"Şule Gürboğa","doi":"10.1016/j.jseaes.2025.106509","DOIUrl":"10.1016/j.jseaes.2025.106509","url":null,"abstract":"<div><div>Türkiye is a unique country whose deformation pattern has been formulated in terms of three main plates Eurasia, Africa, Arabia and microplate Anatolian that are actively moving in recent time. This variety creates a giant fault network defining the plate boundaries and intraplate faults. Savrun Fault Zone (SFZ) is one of the intraplate strike-slip faults near west of the 2023 earthquakes area and many controversies have arisen about its activeness. In this study, it is investigated and reported on the geometric, structural, and kinematic characteristics of the SFZ based on field measurements of fault-slip data. At least two different deformation phases have been recognized in the geological evolution of the SFZ; older NNE-SSW compressional tectonic up to Middle Pliocene and the youngest strike-slip regime created by N-S compression and E-W extensional direction. According to the results, SFZ is a reactivated reverse fault and its the present-day configuration is an active sinistral strike-slip architecture comprising three segments (north, middle and east) and two contractional stepovers reflecting strong geomorphic indicators marked by strike parallel fault valley.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"281 ","pages":"Article 106509"},"PeriodicalIF":2.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143172370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Velocities and strain rates in the Baikal-Mongolia region from the GNSS data","authors":"A.V. Lukhnev,&nbsp;V.A. Sankov,&nbsp;A.I. Miroshnichenko,&nbsp;L.M. Byzov,&nbsp;A.V. Sankov,&nbsp;O.F. Lukhneva","doi":"10.1016/j.jseaes.2025.106500","DOIUrl":"10.1016/j.jseaes.2025.106500","url":null,"abstract":"<div><div>We carried out study crustal deformations in the Baikal-Mongolian area as a key Indo-Asian collision zone including kinematic, geodynamic, and active tectonic aspects. The GNSS measurement data over the last 29 years formed the basis for calculating vectors of horizontal tectonic movements at a qualitatively new level. Recent results show the southeastern movement of the Trans-Baikal sites at an average velocity of 2 mm yr⁻¹.</div><div>We calculated the most realistic velocity of the opening of the Baikal Rift are of 0.9 ± 0.1 mm year⁻¹. On the basic long-term measurements we are computed the parameters of the rotation pole of the Siberian block (φ.: 53.107°; λ.: −99.793°; Mg.: 0.249282° Myr⁻¹).</div><div>The maximum values of area extension rates are mainly confined to the central parts of the Baikal rift and the Tunka depression. The amplitudes of the relative deformation extension exceed 20 × 10^-9 yr⁻¹.</div><div>The strain rate analysis also provided an opportunity to distinguish three deformation domains – contraction-, extension- and transition-dominated. Narrow zones identified between the extension- and contraction-dominated deformation domains are confined to large seismic events therein. Transitional zones are found in the central Mongolia, Transbaikalia and Tuva, with dilatation rates ranging from −5 to 5 × 10^-9 yr⁻¹.</div><div>A sharp positive to negative dilatation transition boundary is associated with recent significant seismic events.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"281 ","pages":"Article 106500"},"PeriodicalIF":2.7,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143173344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Origin of Late Triassic lamprophyres in the western Yanshan Tectonic Belt related to destruction of the North China Craton: Geochronological and geochemical constraints","authors":"Zhuang Li ,&nbsp;Guochun Zhao ,&nbsp;Bin Chen ,&nbsp;Mingshuo Qin","doi":"10.1016/j.jseaes.2025.106504","DOIUrl":"10.1016/j.jseaes.2025.106504","url":null,"abstract":"<div><div>Lamprophyres, ultrapotassic igneous rocks generally derived from the melting of enriched subcontinental lithospheric mantle, typically form in extensional tectonic settings and are associated with coeval transcrustal processes. The genesis of lamprophyres provides insights into the generation, storage, and emplacement of lamprophyric magmas, and further constrains the nature of mantle sources. However, the origin of lamprophyres remains enigmatic and requires further investigation. The Late Triassic lamprophyres along the western Yanshan Tectonic Belt of the northern North China Craton (NCC) offer a key opportunity to understand the tectonic evolution of this region, particularly their relationship with the onset of craton destruction. Here we report the results of an integrated geochronological and geochemical study of Late Triassic lamprophyres and quartz monzonite porphyries in Beijing on the western Yanshan Tectonic Belt. U–Pb zircon dating using LA–ICP–MS reveals that the lamprophyres and quartz monzonite porphyries were emplaced contemporaneously during <em>ca.</em> 235–220 Ma, marking a Late Triassic magmatic event in the northern NCC. The Late Triassic lamprophyre and quartz monzonite porphyry sills are enriched in large ion lithophile elements (LILEs) and light rare earth elements (LREEs) but are depleted in high field strength elements (HFSEs), exhibiting arc-like geochemical characteristics. They also display high MgO and total alkali concentrations with low silica contents. Unradiogenic whole-rock Nd and Hf isotope compositions [(ε_Nd(t) = −11.3 to −10.8) and (ε_Hf(t) = −16.3 to −12.5)] indicate that the magmas of the Triassic suite were likely derived from an enriched lithospheric mantle source, followed by fractional crystallization of ferromagnesian phases and minor crustal assimilation. Geochemical modeling suggests that the parental magma of the lamprophyres was generated through a low degree (&lt;5 %) partial melting of spinel–garnet lherzolites. These results suggest that the investigated rocks originated from a subcontinental lithospheric mantle enriched by fluid and/or melt metasomatism, likely during subduction of the Paleo-Asian oceanic plate beneath the NCC. Radiogenic zircon Hf isotope compositions [e.g., ε_Hf(t) = 6.4 to 8.9] of the Late Triassic lamprophyres point to the involvement of a depleted mantle source. The upwelling of the asthenosphere, triggered by intensive intra-continental extension during the Triassic, likely provided the heat required to melt the enriched subcontinental lithosphere beneath the NCC. This Late Triassic interaction between the asthenosphere and the lithospheric mantle marks the onset of NCC destruction and contributed to its thermo-mechanical erosion.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"281 ","pages":"Article 106504"},"PeriodicalIF":2.7,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}