Acta Geologica Sinica ‐ English Edition最新文献_第7页

Genesis Mechanism of Heat Source in Mianhuakeng Uranium Deposit, South China: Insights from Radiogenic Heat Production of Granite Bodies 华南冕华坑铀矿床热源成因机制——来自花岗岩体放射成因热的启示

IF 3.7 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2026-02-19 DOI: 10.1111/1755-6724.70036

Siqi WANG, Baojian ZHANG, Guosen LÜ, Feng LIU, Xi ZHU

{"title":"Genesis Mechanism of Heat Source in Mianhuakeng Uranium Deposit, South China: Insights from Radiogenic Heat Production of Granite Bodies","authors":"Siqi WANG, Baojian ZHANG, Guosen LÜ, Feng LIU, Xi ZHU","doi":"10.1111/1755-6724.70036","DOIUrl":"https://doi.org/10.1111/1755-6724.70036","url":null,"abstract":"The Mianhuakeng uranium deposit, characterized by uranium-rich granite, serves as a key site for research into crustal radioactive heating. Based on 45 rock samples, this study reviews that the host granite in the Mianhuakeng uranium deposit has a high radioactive heat production rate (avg. 5.50 μW/m3) and a low Th/U ratio (avg. 2.62). Uranium-rich granite and its alteration zone within the upper crust (0–5 km depth) contribute about 45% of the total radioactive heat production, wich is crucial for controlling geothermal resource distribution. For uranium-thermal at tectonic plate margins, a symbiotic geological model was proposed: Firstly, subduction of the Pacific Plate caused upwelling of the asthenosphere, generating a high heat-flow background. Secondly, heat transfer is enhanced by major faults such as the Youdong and Mianhuakeng faults. Subsequently, uranium was mobilized, transported, and enriched within the granite through deep siliceous hydrothermal activity and associated alteration. Ultimately, the uranium enrichment in granite leads to increased radioactive heat production, resulting in local thermal anomalies. This model provides a theoretical support for exploring and developing uranium-thermal symbiotic resources in South China.","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"100 1","pages":"286-296"},"PeriodicalIF":3.7,"publicationDate":"2026-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146680480","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}

引用次数: 0

New Fossil Cyprinids from the Miocene of the Lunpola Basin, Northern Tibet, and their Implications 西藏北部伦坡拉盆地中新世塞浦路斯族新化石及其意义

IF 3.7 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2026-02-19 DOI: 10.1111/1755-6724.70024

Tao YANG, Yanyu LI, Shuang YANG, Feixiang WU

{"title":"New Fossil Cyprinids from the Miocene of the Lunpola Basin, Northern Tibet, and their Implications","authors":"Tao YANG, Yanyu LI, Shuang YANG, Feixiang WU","doi":"10.1111/1755-6724.70024","DOIUrl":"https://doi.org/10.1111/1755-6724.70024","url":null,"abstract":"The Series Barbini (subfamily Cyprininae sensu lato) is the most species-rich group within the family Cyprinidae, primarily confined to warm regions of southern Eurasia and Africa. The distribution patterns and evolutionary history of Chinese cyprinins have been effectively shaped by the Cenozoic uplift of the Qinghai–Tibet Plateau and the evolution of the Asian monsoon. Here, we describe two new fossil fishes from the early and middle Miocene of the Lunpola Basin in central Qinghai–Tibet Plateau, China, preserving the ethmoid and the rear of the occipital regions of the neurocranium, infraorbitals, hyopalatine arch, abdominal vertebrae, and some dorsal-fin pterygiophores and unbranched fin rays. Through detailed morphological comparisons, these fossils show definite affinities to Cyprinidae according to the morphology of the neurocranium, vertebral column, and dorsal fin rays; and one of which is classified into the Series Barbini, while the other can only be assigned to the Cyprinidae family level. These findings reveal that the hinterland of the plateau of the early Neogene should have hosted cyprinin fishes of greater diversity than today. This also indicates a warm-temperate paleoclimate suitable for their survival during that period, consistent with the paleoenvironmental and paleoclimatical conditions reconstructed from the contemporaneous mammalian fossil and palynological evidences.","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"100 1","pages":"1-12"},"PeriodicalIF":3.7,"publicationDate":"2026-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146256434","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}

引用次数: 0

Analysis and Modelling of Salt-related Deformation in the Western Sichuan Foreland Basin, China 川西前陆盆地盐相关变形分析与模拟

IF 3.7 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2026-02-19 DOI: 10.1111/1755-6724.70015

Dengfeng QIU, Zongquan HU, John J. WALSH, Jinrui GUO, Zhongming ZHANG

{"title":"Analysis and Modelling of Salt-related Deformation in the Western Sichuan Foreland Basin, China","authors":"Dengfeng QIU, Zongquan HU, John J. WALSH, Jinrui GUO, Zhongming ZHANG","doi":"10.1111/1755-6724.70015","DOIUrl":"https://doi.org/10.1111/1755-6724.70015","url":null,"abstract":"The Western Sichuan Foreland Basin (WSFB) in South China, a prolific hydrocarbon province, exhibits complex structural deformation influenced by Triassic salt tectonics. This paper integrates seismic data and well data to elucidate the role of Middle–Lower Triassic evaporite layers in shaping basin structures, focusing on Xinchang Tectonic Zone (XTZ). Salt layers facilitated decoupled deformation between supra- and sub-salt sequences, forming salt pillows and fault-related folds. Three distinct structural trends were identified in XTZ. Key findings reveal that salt thickness variations correlate with deformation styles: thicker salt promoted detachment folding, while thinner salt led to hard-linked fault systems. Sub-salt E–NE trending reverse faults formed horsetail terminations associated with the Pengzhou faults (PzF), deviating from the primary Longmenshan thrust belt (LmsTB) orientation. Structural evolution occurred in three stages: (1) Indosinian salt deposition and foreland basin initiation; (2) Yanshanian eastward propagation of thrust systems with salt-driven detachment folding; (3) Himalayan reactivation overprinting earlier structures with sub-NS trending folds. This work establishes a direct link between salt layers and structural traps, demonstrating how salt acted as a critical detachment layer during multi-stage compression. Results provide insights into the gas exploration of the Late Triassic Xujiahe Formation, emphasizing the importance of salt-influenced deformation in foreland basin systems.","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"100 1","pages":"265-285"},"PeriodicalIF":3.7,"publicationDate":"2026-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146256583","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}

引用次数: 0

Ultrastructural Observation of Quantonenpollenites, a Characteristic Pollen of the Quantou Formation in the Songliao Basin, and its Taxonomic Clarification 松辽盆地泉头组特有花粉——泉长粒花粉的超微结构观察及其分类澄清

IF 3.7 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2026-02-19 DOI: 10.1111/1755-6724.70035

Cuijing LIAO, Chaoyu ZHANG, Suping LI, Weiqing LIU

{"title":"Ultrastructural Observation of Quantonenpollenites, a Characteristic Pollen of the Quantou Formation in the Songliao Basin, and its Taxonomic Clarification","authors":"Cuijing LIAO, Chaoyu ZHANG, Suping LI, Weiqing LIU","doi":"10.1111/1755-6724.70035","DOIUrl":"https://doi.org/10.1111/1755-6724.70035","url":null,"abstract":"Quantonenpollenites, a pollen taxon which was assumed to be angiosperm, is of great significance in confirming the geological age of its bearing strata. Aims to clarify the taxonomic affiliation of Quantonenpollenites, we investigated the external morphology and internal structure using Light Microscopy (LM), Scanning Electron Microscopy (SEM), and Transmission Electron Microscopy (TEM). According to TEM observations, the exine of Quantonenpollenites pollen is unstratified with the absence of a columellar layer, and the exine is tightly connected with the intine. Based on comprehensive morphological evidence, especially the lack of columellar layer which is typical characteristics existing in almost all angiosperm pollen, the botanical affinity of Quantonenpollenites should be attributed to gymnosperms rather than angiosperms as previously thought. Through comparative analysis, it may have a close affinity with Ephedra, but further analytical data are still needed for verification. As a characteristic palynological type of the Quantou Formation in the Songliao Basin, the occurrence of Quantonenpollenites has indicative significance for determining the age of the hosting strata. By systematically clarifying the phylogenetic affiliation of Quantonenpollenites, together with the other associated palynomorphs, this study provides crucial reference materials for defining the stratigraphic age range of the Quantou Formation (Cenomanian to early Turonian), improves the resolution of stratigraphic age calibration of the Quantou Formation, and provides key paleontological evidence for the refined division of the terrestrial Cretaceous chronostratigraphic framework in the Songliao Basin.","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"100 1","pages":"20-32"},"PeriodicalIF":3.7,"publicationDate":"2026-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146680483","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}

引用次数: 0

Systematic Relationship of a Corystosperms (Fengweioxylon) and its Palaeoecological Significance 一种凤尾柱兰的系统关系及其古生态学意义

IF 3.7 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2026-01-22 DOI: 10.1111/1755-6724.70034

Zikun JIANG, Ning TIAN, Ruiying HAO, Yongdong WANG, Zhenguo NING, Hao WU, Deyu SUN, Cai WANG

引用次数: 0

Metamorphic P-T-t Evolution and Tectonic Implications of High-pressure Granulites in the Qushan Islands, East China Sea 东海曲山群岛高压麻粒岩的变质P-T-t演化及其构造意义

IF 3.7 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2026-01-15 DOI: 10.1111/1755-6724.70025

Yiwen CAO, Xiwen ZHOU, Jie DONG, Xuanyu DENG

{"title":"Metamorphic P-T-t Evolution and Tectonic Implications of High-pressure Granulites in the Qushan Islands, East China Sea","authors":"Yiwen CAO, Xiwen ZHOU, Jie DONG, Xuanyu DENG","doi":"10.1111/1755-6724.70025","DOIUrl":"https://doi.org/10.1111/1755-6724.70025","url":null,"abstract":"Debate has persisted over whether the metamorphic basement of the Zhoushan Islands, easternmost Cathaysia Block, is Precambrian. Here, representative metamorphic rocks from the Qushan Islands were investigated using petrography, mineral chemistry, phase equilibria modeling and SHRIMP zircon U-Pb dating to constrain their metamorphic evolution and tectonic significance. Both the pelitic granulites (garnet-kyanite-perthite -biotite-quartz) and the mafic granulites (garnet-clinopyroxene-amphibole-plagioclase-quartz) reached high-pressure granulite-facies conditions of 1.2–1.4 GPa/820–900°C, and recorded three metamorphic stages along a clockwise P-T path with post-peak isothermal decompression. This trajectory indicated rapid exhumation of thickened continental crust during collisional orogeny. Metamorphic ages of 254 ± 3 Ma, 262 ± 4 Ma and 259 ± 3 Ma were obtained for mafic granulite, pelitic granulite and marble, respectively, and were consistent with the emplacement age of 259 ± 4 Ma for a pegmatite vein. Detrital zircons in metasediments spanned 2706–330 Ma, which constrained the latest deposition to ∼330 Ma; thus represented mid-Paleozoic sediment metamorphosed during the late Paleozoic rather than Precambrian basement. We conclude that the Indosinian tectonothermal event in the Cathaysia Block had originated from late Paleozoic–early Mesozoic collisional orogeny between the South China Plate to the north and the Indochina Block to the south.","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"100 1","pages":"69-81"},"PeriodicalIF":3.7,"publicationDate":"2026-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147280940","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}

引用次数: 0

Response of Sag Pond Sediment to the Paleo-earthquake Events on the Litang Fault, Eastern Tibetan Plateau 青藏高原东部理塘断裂带凹陷塘沉积对古地震事件的响应

IF 3.7 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2026-01-15 DOI: 10.1111/1755-6724.70021

Xiaoguo XIE, Ning ZHONG, Siyi FU, Huailai ZHOU, Bing LUO

{"title":"Response of Sag Pond Sediment to the Paleo-earthquake Events on the Litang Fault, Eastern Tibetan Plateau","authors":"Xiaoguo XIE, Ning ZHONG, Siyi FU, Huailai ZHOU, Bing LUO","doi":"10.1111/1755-6724.70021","DOIUrl":"https://doi.org/10.1111/1755-6724.70021","url":null,"abstract":"This study examines a 1.32 m thick sediment sequence from the Cunge sag pond in the Litang Basin, eastern Tibetan Plateau, to assess the seismicity of the Litang fault during the Holocene. High-resolution geochemical, grain size, magnetic susceptibility, and total organic carbon indicators are employed to obtain a continuous record of changes in elemental, physical, and biological properties within the profile to identify seismic events. The seismic event layer generally comprises two sedimentary rhythms: a lower coarse sand layer and an upper fine silt-clay layer. These layers represent rapid deposition associated with fault activity (Earthquake A) and slower deposition during calm periods or earthquake recurrence intervals (Seismic interval A). Through six 14C dating, five seismic events have been identified in the Cunge sag pond section: E1 (before 3955 a B.P.), E2 (3713–3703 a B.P.), E3 (3492–3392 a B.P.), E4 (2031–1894 a B.P.), and E5 (1384–1321 a B.P.). E1–E4 had shown a good consistency with the paleo-earthquake recorded by the trench, and whereas E5 is a newly identified seismic event, further improving the continuous earthquake sequence of the Litang fault. Based on existing trench data and the seismic event record from the Cunge sag pond, a total of 11 paleo-earthquakes are identified along the Litang fault since the Holocene. The paleo-earthquake activity of the Litang fault exhibits a clustered pattern, with recurrence intervals of both long periods (1000 a) and short periods (500 a). Since 5000 a, the interval between strong earthquake recurrences gradually decreases, indicating an increasing risk of strong earthquakes along the Litang fault. This study presents a continuous record of paleo-earthquakes along the Litang fault, eastern Tibetan Plateau, and can enhance the understanding of regional seismic activity.","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"100 1","pages":"220-230"},"PeriodicalIF":3.7,"publicationDate":"2026-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146256590","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}

引用次数: 0

Geochemical Characteristics and Origin of Natural Gas from the Ordovician Middle Gas-bearing Assemblage in the Ordos Basin: A Case Study of the Daniudi Gas Field 鄂尔多斯盆地奥陶系中含气组合天然气地球化学特征及成因——以大牛地气田为例

IF 3.7 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2026-01-15 DOI: 10.1111/1755-6724.70030

Xiaoqi WU, Ping WANG, Quanyou LIU, Chunhua NI, Yi ZHANG, Dongya ZHU, Huichong JIA, Liange XIANG

{"title":"Geochemical Characteristics and Origin of Natural Gas from the Ordovician Middle Gas-bearing Assemblage in the Ordos Basin: A Case Study of the Daniudi Gas Field","authors":"Xiaoqi WU, Ping WANG, Quanyou LIU, Chunhua NI, Yi ZHANG, Dongya ZHU, Huichong JIA, Liange XIANG","doi":"10.1111/1755-6724.70030","DOIUrl":"https://doi.org/10.1111/1755-6724.70030","url":null,"abstract":"The Ordovician Majiagou Formation (O1m) in the Ordos Basin is a crucial exploration field for natural gas, and exploration of the Ordovician middle assemblage (O1m55–7) has recently yielded great breakthrough. The Daniudi gas field provides a good case study to determine the gas source for the strata. The O1m55–7 gas displays C1/C1–5 ratios of 0.932–0.985 and CO2 contents of 1.56%–11.75%, and the detectable H2S content ranges from 0.0002% to 1.8617%. The δ13C1, δ13C2, δ13CCO2, and δD1 values are −39.7‰ to −35.6‰, −30.4‰ to −23.7‰, −12.4‰ to −4.6‰, and −204‰ to −185‰, respectively. Identification of the gas origin and source indicates that the gaseous alkanes are commonly coal-derived gas. The gas was generated from the coal measures in the Taiyuan Formation (C3t) and subsequently migrated. A small amount of oil-associated gas, mainly from O1m carbonate source rocks, has been incorporated into the gas reservoir. The natural gas has experienced insignificant alteration by thermochemical sulfate reduction, and the relatively high levels of CO2 are probably associated with corrosion alteration of carbonate reservoirs by injected fluid during acid fracturing.","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"100 1","pages":"188-199"},"PeriodicalIF":3.7,"publicationDate":"2026-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147275027","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}

引用次数: 0

Rock Magnetic Characterization of the Seismogenic Environment of the Large Earthquake within Wenchuan Earthquake Fault Scientific Drilling Borehole 2 Cores 汶川地震断裂带2孔岩心大地震发震环境的岩石磁学特征

IF 3.7 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2026-01-14 DOI: 10.1111/1755-6724.70026

Lei ZHANG, Haibing LI, Zhiming SUN, Yong CAO, Peng XU, Chunrui LI, Huan WANG, Yong ZHENG, Jialiang SI

{"title":"Rock Magnetic Characterization of the Seismogenic Environment of the Large Earthquake within Wenchuan Earthquake Fault Scientific Drilling Borehole 2 Cores","authors":"Lei ZHANG, Haibing LI, Zhiming SUN, Yong CAO, Peng XU, Chunrui LI, Huan WANG, Yong ZHENG, Jialiang SI","doi":"10.1111/1755-6724.70026","DOIUrl":"https://doi.org/10.1111/1755-6724.70026","url":null,"abstract":"The Yingxiu–Beichuan fault zone (YBFZ) has long been active and experienced repeated large earthquakes. The physicochemical properties of the deep fault zone (>1000 m) are the key to understanding the deformation mechanism of large earthquakes. This study uses rock magnetic, microstructural, and geochemical analyses of representative samples exposed in FZ1681 within the Wenchuan Earthquake Fault Scientific Drilling borehole 2 (WFSD-2) cores. Fault gouge and fault breccia have higher magnetic susceptibility values than wall rocks, and they contain abundant paramagnetic minerals and small quantities of magnetite and monoclinic pyrrhotite. The magnetite and monoclinic pyrrhotite in the fault gouge were mainly formed by coseismic frictional heating, indicating that large earthquakes with frictional heating temperatures of ∼500–900°C once occurred in the YBFZ. The seismogenic and coseismic environment was reducing with a relatively high sulfur content. The monoclinic pyrrhotite in the fault breccia was formed mainly by low-temperature hydrothermal fluid. This indicates that the fault zone experienced reducing and low-temperature (<400°C) hydrothermal fluid with a relatively high sulfur content after the earthquake. The YBFZ, which experiences frequent large earthquakes, is weakly oxidizing environment at different depths, but the effect of the low-temperature hydrothermal fluid is weaker at depth.","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"100 1","pages":"251-264"},"PeriodicalIF":3.7,"publicationDate":"2026-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146256361","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}

引用次数: 0

Petrogenesis of Permian–Triassic Sanukites in the Funing Area, South China: Insights into Backarc Basin Magmatism Driven by Paleo-Tethys Plate Subduction 阜宁地区二叠纪-三叠纪Sanukites岩石成因：古特提斯板块俯冲作用下弧后盆地岩浆作用的启示

IF 3.7 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2025-12-24 DOI: 10.1111/1755-6724.70020

Zhenglin LI, Xijun LIU, Yujia SONG, Bing ZHAO, Lei LIU, Hongxia YU, Yu SHI

{"title":"Petrogenesis of Permian–Triassic Sanukites in the Funing Area, South China: Insights into Backarc Basin Magmatism Driven by Paleo-Tethys Plate Subduction","authors":"Zhenglin LI, Xijun LIU, Yujia SONG, Bing ZHAO, Lei LIU, Hongxia YU, Yu SHI","doi":"10.1111/1755-6724.70020","DOIUrl":"https://doi.org/10.1111/1755-6724.70020","url":null,"abstract":"High-Mg andesites (HMAs) typically originate in subduction-related tectonic settings, including active continental margins and island arcs, and studies of HMAs can constrain the tectonic evolution of the South China Block and Paleo-Tethyan Ocean. This paper presents new chronological and geochemical data for high-Mg gabbroic diorites in the Funing area, southern South China. The gabbroic diorites yield ages of 254–249 Ma, and have moderate SiO2 contents (51.3%–57.8%), high MgO contents (4.6%–10.2%) and Mg# values (52–75), enrichment in large-ion lithophile elements and light rare earth elements, and depletion in high-field-strength elements—collectively displaying geochemical signatures typical of sanukites. The gabbroic diorites have radiogenic initial Sr and Pb isotopic compositions, and negative εNd(t) and εHf(t) values. These characteristics distinguish the Funing gabbroic diorites from subduction-related igneous rocks in the Paleo-Pacific tectonic domain. Instead, they are isotopically similar to HMAs and basalts along the Paleo-Tethys suture. We propose the high-Mg gabbroic diorites and basaltic andesites in Funing area share a common mantle source, linked to subduction and rollback of the Paleo-Tethyan plate beneath the South China Block, which triggered back-arc rifting and partial melting of the metasomatized lithospheric mantle during the Late Permian to Early Triassic.","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"100 1","pages":"121-136"},"PeriodicalIF":3.7,"publicationDate":"2025-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146224504","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}

引用次数: 0