Pub Date : 2024-12-19DOI: 10.1016/j.jseaes.2024.106466
Jiahong Liu , Wei Yue , Jing Chen , Xiyuan Yue , Lingmin Zhang , Yalong Li , Xianbin Liu
As one of the main depocenters in East China, the Subei Basin (SBB) is crucial for understanding the evolution of the Yangtze River. This study utilises analysis of zircon chronology and heavy minerals on the SBB strata, to gain new insights of the sediment provenance related to the proto-Yangtze River since the late Pliocene. The findings reveal different patterns of provenance evolution during the Plio–Pleistocene between the northern and southern SBB. In the southern SBB, two distinct patterns of zircon age spectra are observed in the late Plio–Pleistocene strata, with changes from a single-peak mode of Mesozoic ages in the late Pliocene strata, to a multi-peak mode in the early Pleistocene strata. Meanwhile, heavy mineral assemblages change correspondingly from epidote–limonite–ilmenite to amphibole–limonite–ilmenite. However, the zircon age spectrum and heavy minerals of the upper Pliocene strata in the northern SBB resemble those of the lower Pleistocene strata in the southern SBB. These observations suggest varying sources of sediment between the northern and southern SBB during the late Pliocene and a unified source during the Pleistocene. During the late Pliocene, the southern SBB primarily accumulated sediments from local sources, including the surrounding areas and the lower reaches of the Yangtze River. Concurrently, the northern SBB began receiving sediments from the upper Yangtze. The provenance evolution implies a connection between the proto-Yangtze River and SBB, at least during the late Pliocene, followed by a southward migration of the river channel towards the modern Yangtze River Delta, which is associated with regional tectonic subsidence.
{"title":"Provenance of Plio–Pleistocene sediments of the Subei Basin, East China with implication for proto-Yangtze channelization","authors":"Jiahong Liu , Wei Yue , Jing Chen , Xiyuan Yue , Lingmin Zhang , Yalong Li , Xianbin Liu","doi":"10.1016/j.jseaes.2024.106466","DOIUrl":"10.1016/j.jseaes.2024.106466","url":null,"abstract":"<div><div>As one of the main depocenters in East China, the Subei Basin (SBB) is crucial for understanding the evolution of the Yangtze River. This study utilises analysis of zircon chronology and heavy minerals on the SBB strata, to gain new insights of the sediment provenance related to the proto-Yangtze River since the late Pliocene. The findings reveal different patterns of provenance evolution during the Plio–Pleistocene between the northern and southern SBB. In the southern SBB, two distinct patterns of zircon age spectra are observed in the late Plio–Pleistocene strata, with changes from a single-peak mode of Mesozoic ages in the late Pliocene strata, to a multi-peak mode in the early Pleistocene strata. Meanwhile, heavy mineral assemblages change correspondingly from epidote–limonite–ilmenite to amphibole–limonite–ilmenite. However, the zircon age spectrum and heavy minerals of the upper Pliocene strata in the northern SBB resemble those of the lower Pleistocene strata in the southern SBB. These observations suggest varying sources of sediment between the northern and southern SBB during the late Pliocene and a unified source during the Pleistocene. During the late Pliocene, the southern SBB primarily accumulated sediments from local sources, including the surrounding areas and the lower reaches of the Yangtze River. Concurrently, the northern SBB began receiving sediments from the upper Yangtze. The provenance evolution implies a connection between the proto-Yangtze River and SBB, at least during the late Pliocene, followed by a southward migration of the river channel towards the modern Yangtze River Delta, which is associated with regional tectonic subsidence.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"280 ","pages":"Article 106466"},"PeriodicalIF":2.7,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143136360","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}
Pub Date : 2024-12-18DOI: 10.1016/j.jseaes.2024.106469
Weixin Zhang , Sandong Zhou , Zaichao Yu , Xinyu Liu , Shaoqiu Wang , Hongbo Miao , Dameng Liu , Jijun Tian , Hua Wang
Shale oil exploration has achieved a breakthrough in the first member of the Paleogene Shuangyang Formation in the Luxiang fault depression of Yitong Basin. However, the characteristics and evolution of medium–high maturity siliceous shale in this lacustrine basin remain to be fully understood. The coupled evolution of organic matter (OM), quartz, different types of clay, and pore space in the Shuangyang shale is investigated considering differences in pore structure compared to marine and continental shales with low-medium maturity. The Shuangyang shale (depth greater than 3400 m), mainly argillaceous-rich siliceous shale, significantly influences pore volume and specific surface area through the effect of mesopores (2–50 nm). Ink-bottle-shaped pores are dominated by OM pores and dissolved interparticle pores. Parallel plate-shaped pores are predominantly OM shrinkage fractures and intracrystalline pores. Shale pore volume and specific surface area decrease with increasing kaolinite content. The presence of chlorite in foliated form and the ordered distribution of illite/smectite mixed layers (I/S) enhances the specific surface area. Pore overpressure from smectite dehydration during the transformation of I/S to illite helps preserve the primary pores. Pore volume increases as I/S decreases and illite increases. In the middle-high maturity stage (Ro = 1.24–1.34 %), OM content emerges as the primary factor influencing pore formation. The coupling effect of siliceous mineral skeleton (quartz) and overpressure is crucial for pore preservation. This study expands our understanding of shale pore systems in argillaceous-rich siliceous shale within the medium–high maturity range and reveals significant discrepancies in shale pore evolution concerning OM and mineral components.
{"title":"Controls of clay mineral transformation and organic matter on pore networks of the Paleogene lacustrine shale oil system in the Yitong Basin, NE China","authors":"Weixin Zhang , Sandong Zhou , Zaichao Yu , Xinyu Liu , Shaoqiu Wang , Hongbo Miao , Dameng Liu , Jijun Tian , Hua Wang","doi":"10.1016/j.jseaes.2024.106469","DOIUrl":"10.1016/j.jseaes.2024.106469","url":null,"abstract":"<div><div>Shale oil exploration has achieved a breakthrough in the first member of the Paleogene Shuangyang Formation in the Luxiang fault depression of Yitong Basin. However, the characteristics and evolution of medium–high maturity siliceous shale in this lacustrine basin remain to be fully understood. The coupled evolution of organic matter (OM), quartz, different types of clay, and pore space in the Shuangyang shale is investigated considering differences in pore structure compared to marine and continental shales with low-medium maturity. The Shuangyang shale (depth greater than 3400 m), mainly argillaceous-rich siliceous shale, significantly influences pore volume and specific surface area through the effect of mesopores (2–50 nm). Ink-bottle-shaped pores are dominated by OM pores and dissolved interparticle pores. Parallel plate-shaped pores are predominantly OM shrinkage fractures and intracrystalline pores. Shale pore volume and specific surface area decrease with increasing kaolinite content. The presence of chlorite in foliated form and the ordered distribution of illite/smectite mixed layers (I/S) enhances the specific surface area. Pore overpressure from smectite dehydration during the transformation of I/S to illite helps preserve the primary pores. Pore volume increases as I/S decreases and illite increases. In the middle-high maturity stage (Ro = 1.24–1.34 %), OM content emerges as the primary factor influencing pore formation. The coupling effect of siliceous mineral skeleton (quartz) and overpressure is crucial for pore preservation. This study expands our understanding of shale pore systems in argillaceous-rich siliceous shale within the medium–high maturity range and reveals significant discrepancies in shale pore evolution concerning OM and mineral components.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"280 ","pages":"Article 106469"},"PeriodicalIF":2.7,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143097456","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}
In the past decade, the seismicity in the Garhwal Himalayas has been recorded by eight three-component broadband seismographs (BBS) deployed all along the Garhwal Himalayan Seismic Belt (GHSB). In this study, we estimated the source parameters of 52 local earthquakes of Mw1.5–3.3 using a 3-month seismicity catalog and the recordings of the broadband seismographs in a shear wave spectral inversion. This iterative technique is based on Brune’s (1970) ω-square circular source spectral model. The modeled source parameters, including corner frequency (fc), source- radius (r), stress drop (Δσ), seismic moment (Mo), and moment magnitude (Mw), varied in the ranges of 1.3–11.58 Hz, 117.6–1054.4 m, 0.004–36 bar, 2.83E+11–1.33E+14 N-m, and 1.5–3.3 respectively. The highest computed stress drop (Δσ max) is 36 bar, while the lowest computed stress drop (Δσ min) is 0.004 bar for events of Mw 2.84 and Mw 1.81, respectively. The scaling relation between fc and Mo is obtained as Mo = Afc−2.6 N-m/s3 where, (A = 4 × 1013) N-m/s3, while between Mo and Δσ the relation is found to be as log (Δσ) = 0.605 log (Mo)-17.35 and Mo vs. radius, Mo = Br1.24. where (B = 3 × 109). The relation between Mw and Mo is obtained as Mo = C Mw7.51, where (C = 1 × 1010) and other relations are obtained as follows: (Δσ) = D Mw4.7894 where (D = 0.0268), fc = E r−0.948 where (E = 1102.7), Depth (d) = F (Δσ)−0.111. (F = 9.699). The estimation of earthquakes source parameters through waveform spectrum is an important component for the study of seismogenesis and obtaining scaling relations is crucial for understanding the seismic hazard assessment. The scaling relations are used to develop ground motion prediction equations (GMPEs) that relate earthquake source parameters to ground shaking characteristics (e.g., peak ground acceleration, spectral acceleration). The significant result is that our modelling indicates a scaling relationship between Mo and fc suggesting Mo fc2.6 ∝ Constant for Garhwal Himalaya based on local earthquakes of Mw 1.5 to 3.3. These scaling relationships derived from our current study could enhance earthquake hazard modelling for the Garhwal Himalayan region. This, in turn, could allow earthquake engineers to construct more resilient buildings in the area.
{"title":"Estimation of source parameters and scaling relationship of the local earthquakes in the Central Seismic gap NW Himalaya, India","authors":"Abhishek Kumar Gupta, Anil Tiwari, Naresh Kumar, Ajay Paul, Kalachand Sain, Dilip Kumar Yadav, Ashish Pal, Debonil Baruah","doi":"10.1016/j.jseaes.2024.106465","DOIUrl":"10.1016/j.jseaes.2024.106465","url":null,"abstract":"<div><div>In the past decade, the seismicity in the Garhwal Himalayas has been recorded by eight three-component broadband seismographs (BBS) deployed all along the Garhwal Himalayan Seismic Belt (GHSB). In this study, we estimated the source parameters of 52 local earthquakes of M<sub>w</sub>1.5–3.3 using a 3-month seismicity catalog and the recordings of the broadband seismographs in a shear wave spectral inversion. This iterative technique is based on <span><span>Brune’s (1970)</span></span> ω-square circular source spectral model. The modeled source parameters, including corner frequency (fc), source- radius (r), stress drop (Δσ), seismic moment (Mo), and moment magnitude (Mw), varied in the ranges of 1.3–11.58 Hz, 117.6–1054.4 m, 0.004–36 bar, 2.83E+11–1.33E+14 N-m, and 1.5–3.3 respectively. The highest computed stress drop (Δσ max) is 36 bar, while the lowest computed stress drop (Δσ min) is 0.004 bar for events of M<sub>w</sub> 2.84 and M<sub>w</sub> 1.81, respectively. The scaling relation between fc and Mo is obtained as Mo = Afc<strong><sup>−</sup></strong><sup>2.6</sup> N-m/s<sup>3</sup> where, (A = 4 × 10<sup>13</sup>) N-m/s<sup>3</sup>, while between Mo and Δσ the relation is found to be as log (Δσ) = 0.605 log (Mo)-17.35 and Mo vs. radius, Mo = Br<sup>1.24.</sup> where (B = 3 × 10<sup>9</sup>). The relation between Mw and Mo is obtained as Mo = C Mw<sup>7.51</sup>, where (C = 1 × 10<sup>10</sup>) and other relations are obtained as follows: (Δσ) = D Mw<sup>4.7894</sup> where (D = 0.0268), fc = E r<strong><sup>−</sup></strong><sup>0.948</sup> where (E = 1102.7), Depth (d) = F (Δσ)<strong><sup>−</sup></strong><sup>0.111</sup>. (F = 9.699). The estimation of earthquakes source parameters through waveform spectrum is an important component for the study of seismogenesis and obtaining scaling relations is crucial for understanding the seismic hazard assessment. The scaling relations are used to develop ground motion prediction equations (GMPEs) that relate earthquake source parameters to ground shaking characteristics (e.g., peak ground acceleration, spectral acceleration). The significant result is that our modelling indicates a scaling relationship between Mo and fc suggesting Mo fc<sup>2.6</sup> ∝ Constant for Garhwal Himalaya based on local earthquakes of Mw 1.5 to 3.3. These scaling relationships derived from our current study could enhance earthquake hazard modelling for the Garhwal Himalayan region. This, in turn, could allow earthquake engineers to construct more resilient buildings in the area.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"280 ","pages":"Article 106465"},"PeriodicalIF":2.7,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143097459","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}
Pub Date : 2024-12-16DOI: 10.1016/j.jseaes.2024.106467
Weiling Zhu , Yingfeng Ji , Lijun Liu , Rui Qu , Ye Zhu
Devastating earthquakes tend to occur in the eastern portion of the Solomon Sea, while small–medium events are distributed along the entire margin. The process controlling megathrust ruptures along this convex slab remains enigmatic in terms of both its nature and the manner of its control. Through 3D modeling, we find a high temperature gradient on the obliquely oriented flank of the convex slab, providing new insights into the tectonics of curved trench subduction. The subduction slab temperature gradient reaches as high as > 10 °C/km, and the dehydration gradient exceeds 0.05 wt%/km, which is associated with the recurrence of M > 7.5 earthquakes in frequently ruptured megathrust faults. The subducted plate immediately beneath the Moho depth of the overriding plate, corresponding to the source region of the largest number of seismic events at a depth of 30 ∼ 40 km, exhibits peak values in both the slab thermal gradient and dehydration gradient, revealing previously unrecognized intrinsic correlations.
{"title":"High slab thermal gradient facilitates dehydration and megathrust ruptures in the Solomon Sea plate","authors":"Weiling Zhu , Yingfeng Ji , Lijun Liu , Rui Qu , Ye Zhu","doi":"10.1016/j.jseaes.2024.106467","DOIUrl":"10.1016/j.jseaes.2024.106467","url":null,"abstract":"<div><div>Devastating earthquakes tend to occur in the eastern portion of the Solomon Sea, while small–medium events are distributed along the entire margin. The process controlling megathrust ruptures along this convex slab remains enigmatic in terms of both its nature and the manner of its control. Through 3D modeling, we find a high temperature gradient on the obliquely oriented flank of the convex slab, providing new insights into the tectonics of curved trench subduction. The subduction slab temperature gradient reaches as high as > 10 °C/km, and the dehydration gradient exceeds 0.05 wt%/km, which is associated with the recurrence of M > 7.5 earthquakes in frequently ruptured megathrust faults. The subducted plate immediately beneath the Moho depth of the overriding plate, corresponding to the source region of the largest number of seismic events at a depth of 30 ∼ 40 km, exhibits peak values in both the slab thermal gradient and dehydration gradient, revealing previously unrecognized intrinsic correlations.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"279 ","pages":"Article 106467"},"PeriodicalIF":2.7,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143145238","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}
Pub Date : 2024-12-14DOI: 10.1016/j.jseaes.2024.106464
Zhongyuan Yu , Wei Min , Peizhen Zhang , Chunmiao Qiu , Wenxuan Wang , Jian Kang , Shuang Liu
The Daan-Dedu Fault Zone (DDFZ) comprises multiple branches and traverses the interior of the Songliao Basin in the NE China. The studies of recent activity are significant both for tectonic deformation analysis and for strong earthquake hazard assessment of the DDFZ and the Basin interior. None of the earlier studies had found the evidence characterizing the late Quaternary activities of the DDFZ, so it is generally speculated that it is an early Quaternary fault without the ability to great events (M ≥ 7). However, geological evidence of multi-stage strong tectonic deformation of the DDFZ in the late Quaternary was discovered for the first time at the Keshan segment of the structure based on remote sensing image interpretation, surface investigation of geology and geomorphology, trench excavation, and quaternary chronology testing. Field investigation reveals that the latest activity of the DDFZ with an estimated ∼ M7 occurred at 2230 ± 30 a BP has resulted in a fault scarp with ∼ 0.6 ± 0.1 m height at the surface in a normal way, and ∼ 20 km long rupture is developed intermittently with fault scarps and sag ponds at surface. This new discovery indicates that the DDFZ experienced strong tectonic deformation during the late Quaternary, and has the tectonic background for strong earthquakes (M ≥ 7). This discovery also suggests that the Songliao Basin has been undergoing strong tectonic deformation since the Late Quaternary, which is of great significance for understanding the tectonic deformation and evolution of the Songliao Basin and entire NE China since the Late Cenozoic.
{"title":"Holocene activities and tectonic implications of the Da’an-Dedu Fault Zone in the Songliao Basin, NE China","authors":"Zhongyuan Yu , Wei Min , Peizhen Zhang , Chunmiao Qiu , Wenxuan Wang , Jian Kang , Shuang Liu","doi":"10.1016/j.jseaes.2024.106464","DOIUrl":"10.1016/j.jseaes.2024.106464","url":null,"abstract":"<div><div>The Daan-Dedu Fault Zone (DDFZ) comprises multiple branches and traverses the interior of the Songliao Basin in the NE China. The studies of recent activity are significant both for tectonic deformation analysis and for strong earthquake hazard assessment of the DDFZ and the Basin interior. None of the earlier studies had found the evidence characterizing the late Quaternary activities of the DDFZ, so it is generally speculated that it is an early Quaternary fault without the ability to great events (M ≥ 7). However, geological evidence of multi-stage strong tectonic deformation of the DDFZ in the late Quaternary was discovered for the first time at the Keshan segment of the structure based on remote sensing image interpretation, surface investigation of geology and geomorphology, trench excavation, and quaternary chronology testing. Field investigation reveals that the latest activity of the DDFZ with an estimated ∼ M7 occurred at 2230 ± 30 a BP has resulted in a fault scarp with ∼ 0.6 ± 0.1 m height at the surface in a normal way, and ∼ 20 km long rupture is developed intermittently with fault scarps and sag ponds at surface. This new discovery indicates that the DDFZ experienced strong tectonic deformation during the late Quaternary, and has the tectonic background for strong earthquakes (M ≥ 7). This discovery also suggests that the Songliao Basin has been undergoing strong tectonic deformation since the Late Quaternary, which is of great significance for understanding the tectonic deformation and evolution of the Songliao Basin and entire NE China since the Late Cenozoic.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"280 ","pages":"Article 106464"},"PeriodicalIF":2.7,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143092057","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}
Bomi area in the north of Eastern Himalayan Syntaxis is traversed by the large strike-slip Jiali fault. This study aims to investigate fault zone structure and local tectonic stress in the Bomi area. The 3D high-resolution S-wave velocity (Vs) and anisotropy models of the shallow crust (0–4 km) are obtained using the ambient noise recordings from Bomi dense array (207 short-period seismometers) based on a multiscale inversion scheme. The azimuthal anisotropy of the group velocities shows that the fast directions change from N–S to E–W or NW–SE from west to east. This variation is probably affected by the northeastward tectonic stress from the India-Asia collision, eastward extrusion of crustal materials, and the dextral strike-slip activity of the Jiali faults. Vs model suggests that southern low-velocity belts along the Jiali main faults are primarily affected by rock mass fragmentation, and the northern low-velocity feature surrounding the Jiali secondary faults is probably related to the loose sedimentary rock and numerous geothermal waters. The high velocity in the central part may reflect the presence of intrusive Gangdese granite. Additionally, the sediment thickness distribution in the river valleys (Parlung Tsangpo and Bodui Tsangpo) is highly uneven. Sediment thickness in the Bodui Tsangpo is generally greater than that in Parlung Tsangpo. On the western side of Bodui Tsangpo, the sedimentary deposits are thicker than those on the eastern side.
{"title":"High-resolution velocity structure in the Bomi area, Eastern Himalayan Syntaxis, constrained from multiscale ambient noise tomography","authors":"Wei Xu, Pingping Wu, Zhifeng Ding, Laiyu Lu, Tongwei Qin","doi":"10.1016/j.jseaes.2024.106462","DOIUrl":"10.1016/j.jseaes.2024.106462","url":null,"abstract":"<div><div>Bomi area in the north of Eastern Himalayan Syntaxis is traversed by the large strike-slip Jiali fault. This study aims to investigate fault zone structure and local tectonic stress in the Bomi area. The 3D high-resolution S-wave velocity (Vs) and anisotropy models of the shallow crust (0–4 km) are obtained using the ambient noise recordings from Bomi dense array (207 short-period seismometers) based on a multiscale inversion scheme. The azimuthal anisotropy of the group velocities shows that the fast directions change from N–S to E–W or NW–SE from west to east. This variation is probably affected by the northeastward tectonic stress from the India-Asia collision, eastward extrusion of crustal materials, and the dextral strike-slip activity of the Jiali faults. Vs model suggests that southern low-velocity belts along the Jiali main faults are primarily affected by rock mass fragmentation, and the northern low-velocity feature surrounding the Jiali secondary faults is probably related to the loose sedimentary rock and numerous geothermal waters. The high velocity in the central part may reflect the presence of intrusive<!--> <!-->Gangdese granite. Additionally, the sediment thickness distribution in the river valleys (Parlung Tsangpo and Bodui Tsangpo) is highly uneven. Sediment thickness in the Bodui Tsangpo is generally greater than that in Parlung Tsangpo. On the western side of Bodui Tsangpo, the sedimentary deposits are thicker than those on the eastern side.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"280 ","pages":"Article 106462"},"PeriodicalIF":2.7,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143096947","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}
Pub Date : 2024-12-14DOI: 10.1016/j.jseaes.2024.106458
Jie Yuan, Wenxing Hao, Ruoyuan Qiu
{"title":"Corrigendum to “New paleomagnetic and geochronologic results from the eastern Tethyan Himalaya refine the size of Greater India in the Early Cretaceous” [J. Asian Earth Sci. 278 (2025) 106428]","authors":"Jie Yuan, Wenxing Hao, Ruoyuan Qiu","doi":"10.1016/j.jseaes.2024.106458","DOIUrl":"10.1016/j.jseaes.2024.106458","url":null,"abstract":"","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"279 ","pages":"Article 106458"},"PeriodicalIF":2.7,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143145237","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}
Pub Date : 2024-12-13DOI: 10.1016/j.jseaes.2024.106457
Qingsong Cai , Xueyu Yan , Yuxin Fan , Minmin Gao , Guangliang Yang , Ke Bi , Ying Wang , Chuanying Zhu , Mingjie Zhang , Xiaohu Li
{"title":"Corrigendum to “Mesozoic–Cenozoic exhumation of the giant Jinchuan Ni-Cu sulfide deposit, China: Evidence from single-grain apatite (U-Th)/He ages” [J. Asian Earth Sci. 271 (2024) 106231]","authors":"Qingsong Cai , Xueyu Yan , Yuxin Fan , Minmin Gao , Guangliang Yang , Ke Bi , Ying Wang , Chuanying Zhu , Mingjie Zhang , Xiaohu Li","doi":"10.1016/j.jseaes.2024.106457","DOIUrl":"10.1016/j.jseaes.2024.106457","url":null,"abstract":"","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"279 ","pages":"Article 106457"},"PeriodicalIF":2.7,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143127886","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}
The volcanic rocks in the Saraburi–Lop Buri area of Central Thailand consist of three main units: a basaltic–andesitic rock unit predominantly composed of plagioclase and hornblende with a typical porphyritic texture, an andesitic rock unit usually composed of plagioclase, hornblende and quartz, and a rhyolitic rock unit dominated by quartz, plagioclase, K-feldspar, and muscovite. Whole-rock compositions suggest that basaltic–andesitic rocks originated from low-K calc-alkaline magma via melting of a subducted slab with a relatively high degree of partial melting. The andesitic and rhyolitic rocks are possibly differentiated from high-K calc-alkaline magmas. All volcanic rocks are probably emplaced in a continental arc tectonic setting. The zircon U–Pb ages of the basaltic–andesitic rock unit and andesitic rock unit are 213.4 ± 0.5 Ma and 203.5 ± 0.3 Ma, respectively, indicating that the arc volcanism resulted from subduction during the Late Triassic.
{"title":"Subduction-related magmatism in the Indochina Terrane: Insights from Triassic volcanic rocks in Central Thailand","authors":"Thirawat Tukpho , Christoph A. Hauzenberger , Daniela Gallhofer , Etienne Skrzypek , Srett Santitharangkun , Montree Sirimongkonpun , Alongkot Fanka","doi":"10.1016/j.jseaes.2024.106459","DOIUrl":"10.1016/j.jseaes.2024.106459","url":null,"abstract":"<div><div>The volcanic rocks in the Saraburi–Lop Buri area of Central Thailand consist of three main units: a basaltic–andesitic rock unit predominantly composed of plagioclase and hornblende with a typical porphyritic texture, an andesitic rock unit usually composed of plagioclase, hornblende and quartz, and a rhyolitic rock unit dominated by quartz, plagioclase, K-feldspar, and muscovite. Whole-rock compositions suggest that basaltic–andesitic rocks originated from low-K calc-alkaline magma via melting of a subducted slab with a relatively high degree of partial melting. The andesitic and rhyolitic rocks are possibly differentiated from high-K calc-alkaline magmas. All volcanic rocks are probably emplaced in a continental arc tectonic setting. The zircon U–Pb ages of the basaltic–andesitic rock unit and andesitic rock unit are 213.4 ± 0.5 Ma and 203.5 ± 0.3 Ma, respectively, indicating that the arc volcanism resulted from subduction during the Late Triassic.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"279 ","pages":"Article 106459"},"PeriodicalIF":2.7,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143146024","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}
Pub Date : 2024-12-12DOI: 10.1016/j.jseaes.2024.106454
Pengfei Di , Niu Li , Dong Feng , Jörn Peckmann , Shuhong Wang , Duofu Chen
Quantifying the contribution of different carbon sources to dissolved inorganic carbon (DIC) flux in cold seep environments is critical for understanding the global carbon cycle. Pore water geochemical compositions provide insights into the biogeochemical processes of different DIC sources at cold seeps. Here, δ13CDIC values as well as SO42–, DIC, Ca2+, Mg2+, and PO43– concentrations of three push cores were analyzed with a reactive transport model to distinguish the DIC sources and calculate the DIC budget in the shallow sediments of the Haima cold seeps. The shallow depths of the sulfate methane transition zone (SMTZ) indicate significant methane flux and anaerobic oxidation of methane (AOM). The model results confirm that AOM is the primary biogeochemical process consuming sulfate at three sites, accounting for 99.5%, 91.5%, and 52.1%, respectively. The Sr/Ca vs. Mg/Ca ratio shows that high-Mg calcite precipitation occurred at ROV4 and ROV5 sites, while the carbonated phase precipitating at ROV01 site was 73.8% aragonite accompanied by 26.2% of high-Mg calcite. Moreover, extremely low δ13CDIC values indicate the presence of deep-sourced biogenic methane at the three sites. Based on the δ13C mass balance, the contribution of methane to DIC by AOM and methanogenesis is 99.6%, 95.4%, and 62.1%, respectively. Thus, methanogenesis is another primary source of DIC at the Haima cold seeps. Our study documents the influence of deep-sourced methane and methanogenesis on DIC flux at seeps and demonstrates that the DIC budget of seep sediments is a major contributor to the marine carbon pool and the marine carbon cycle.
{"title":"Quantifying the flux of dissolved inorganic carbon in surface sediments of the Haima cold seep area, northern South China Sea","authors":"Pengfei Di , Niu Li , Dong Feng , Jörn Peckmann , Shuhong Wang , Duofu Chen","doi":"10.1016/j.jseaes.2024.106454","DOIUrl":"10.1016/j.jseaes.2024.106454","url":null,"abstract":"<div><div>Quantifying the contribution of different carbon sources to dissolved inorganic carbon (DIC) flux in cold seep environments is critical for understanding the global carbon cycle. Pore water geochemical compositions provide insights into the biogeochemical processes of different DIC sources at cold seeps. Here, δ<sup>13</sup>C<sub>DIC</sub> values as well as SO<sub>4</sub><sup>2–</sup>, DIC, Ca<sup>2+</sup>, Mg<sup>2+</sup>, and PO<sub>4</sub><sup>3–</sup> concentrations of three push cores were analyzed with a reactive transport model to distinguish the DIC sources and calculate the DIC budget in the shallow sediments of the Haima cold seeps. The shallow depths of the sulfate methane transition zone (SMTZ) indicate significant methane flux and anaerobic oxidation of methane (AOM). The model results confirm that AOM is the primary biogeochemical process consuming sulfate at three sites, accounting for 99.5%, 91.5%, and 52.1%, respectively. The Sr/Ca vs. Mg/Ca ratio shows that high-Mg calcite precipitation occurred at ROV4 and ROV5 sites, while the carbonated phase precipitating at ROV01 site was 73.8% aragonite accompanied by 26.2% of high-Mg calcite. Moreover, extremely low δ<sup>13</sup>C<sub>DIC</sub> values indicate the presence of deep-sourced biogenic methane at the three sites. Based on the δ<sup>13</sup>C mass balance, the contribution of methane to DIC by AOM and methanogenesis is 99.6%, 95.4%, and 62.1%, respectively. Thus, methanogenesis is another primary source of DIC at the Haima cold seeps. Our study documents the influence of deep-sourced methane and methanogenesis on DIC flux at seeps and demonstrates that the DIC budget of seep sediments is a major contributor to the marine carbon pool and the marine carbon cycle.</div></div>","PeriodicalId":50253,"journal":{"name":"Journal of Asian Earth Sciences","volume":"279 ","pages":"Article 106454"},"PeriodicalIF":2.7,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143145037","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}
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