Acta Geologica Sinica ‐ English Edition最新文献_第2页

Occurrence and Enrichment Mechanism of Silver in Yushui Copper Polymetallic Deposit in East Guangdong 粤东玉水铜多金属矿床银的赋存状态及富集机理

IF 2.1 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2026-08-28 Epub Date: 2026-08-05 DOI: 10.1111/1755-6724.70095

Gang Chen, Changhui Ke, Maohong Chen, Wenhao Tang, Zhaoyi Li, Junzeng Zuo

{"title":"Occurrence and Enrichment Mechanism of Silver in Yushui Copper Polymetallic Deposit in East Guangdong","authors":"Gang Chen, Changhui Ke, Maohong Chen, Wenhao Tang, Zhaoyi Li, Junzeng Zuo","doi":"10.1111/1755-6724.70095","DOIUrl":"https://doi.org/10.1111/1755-6724.70095","url":null,"abstract":"<div>\u0000 \u0000 <p>The Yushui copper deposit in Guangdong, China, is a medium-sized high-grade VMS-type deposit consisting mainly of stratiform orebodies (308 Ma) and footwall stockwork orebodies, with minor vein‑type orebodies hosted in hanging wall dolomite along joints and faults. Three mineralisation stages are recognised: Cu‑polymetallic sulphide‑quartz (I), Cu–Ag–polymetallic sulphide-quartz (II) and Ag–Cu–polymetallic sulphide-quartz-calcite (III). EPMA and TIMA analyses show that silver occurs as invisible silver (dominant) and visible silver. Invisible silver is hosted via isomorphic substitution in bornite and other copper sulphides, whereas visible silver occurs as independent minerals, dominated by stromeyerite and argentite. Silver was transported as chloride complexes at early high‑temperature conditions and incorporated into copper sulphides during cooling. With decreasing temperature and oxygen fugacity and increasing pH, silver shifted to hydrosulphide complex transport and eventually precipitated as independent silver minerals. The contrasting occurrence of invisible silver in stratiform VMS orebodies and visible silver in vein‑type orebodies provides key implications for exploration targeting, resource evaluation and mineral processing optimisation in analogous polymetallic deposits.</p>\u0000 </div>","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"100 4","pages":"1204-1219"},"PeriodicalIF":2.1,"publicationDate":"2026-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148823218","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

Miocene Rift Volcanism and Tectonic Insights Into the Pacific–North American Plate Boundary: Paleomagnetic Evidence From Sonora, Mexico 中新世裂谷火山作用和构造对太平洋-北美板块边界的启示：来自墨西哥索诺拉的古地磁证据

IF 2.1 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2026-08-28 Epub Date: 2026-07-20 DOI: 10.1111/1755-6724.70085

L. M. Alva-Valdivia, J. R. Vidal-Solano, L. A. Velderrain-Rojas, L. Pérez-Aguilar, J. A. González-Rangel, A. Agarwal

{"title":"Miocene Rift Volcanism and Tectonic Insights Into the Pacific–North American Plate Boundary: Paleomagnetic Evidence From Sonora, Mexico","authors":"L. M. Alva-Valdivia, J. R. Vidal-Solano, L. A. Velderrain-Rojas, L. Pérez-Aguilar, J. A. González-Rangel, A. Agarwal","doi":"10.1111/1755-6724.70085","DOIUrl":"https://doi.org/10.1111/1755-6724.70085","url":null,"abstract":"<div>\u0000 \u0000 <p>We present paleomagnetic evidence from a detailed study of a middle to late Miocene volcanic succession in the southern Sierra Libre region, Sonora, Mexico, providing new insights into the tectonic evolution of the Pacific–North America plate boundary. The volcanic succession comprises basaltic to trachytic lava flows and silicic ignimbrites formed during continental rifting along the proto-Gulf of California margin. A basal welded ignimbrite is correlated with the Tuff of San Felipe–Hermosillo Ignimbrite (TSF–HI), a key stratigraphic marker across the Gulf of California region. This unit exhibits reverse magnetic polarity and low inclination. TSF–HI is tentatively assigned to subchrons C5An.1r (12.272–12.174 Ma) or C5r.3r (12.049–11.657 Ma) of the geomagnetic polarity timescale. Paleomagnetic vectors from the TSF–HI in the study area are highly stable and indicate a slight counterclockwise vertical-axis rotation of the southern Sierra Libre, consistent with deformation observed in the Baja California microplate. The tectonic regime reflects transtensional deformation with a subordinate strike-slip component, decreasing inland from the coast. Magnetostratigraphic and petrologic data support an age of 10.5–12.2 Ma for the volcanic succession, representing synrift volcanism linked to the early tectonic evolution of the Gulf of California. These findings improve our understanding of Miocene continental rifting processes and kinematics along the Pacific–North America plate boundary.</p>\u0000 </div>","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"100 4","pages":"994-1009"},"PeriodicalIF":2.1,"publicationDate":"2026-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148823227","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

Global Climate Recovery and Marine Ecosystem Shifts Across the Oligocene–Miocene Transition: Foraminiferal Evidence From the Offshore Nile Delta, Egypt 渐新世-中新世过渡时期的全球气候恢复和海洋生态系统变迁：来自埃及尼罗河三角洲近海有孔虫证据

IF 2.1 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2026-08-28 Epub Date: 2026-07-13 DOI: 10.1111/1755-6724.70087

Banan Shahin, Abdalla Shahin, Ahmed A. Abdelhady, Haitham M. Ayyad

{"title":"Global Climate Recovery and Marine Ecosystem Shifts Across the Oligocene–Miocene Transition: Foraminiferal Evidence From the Offshore Nile Delta, Egypt","authors":"Banan Shahin, Abdalla Shahin, Ahmed A. Abdelhady, Haitham M. Ayyad","doi":"10.1111/1755-6724.70087","DOIUrl":"https://doi.org/10.1111/1755-6724.70087","url":null,"abstract":"<div>\u0000 \u0000 <p>Oligocene–Miocene transition (OMT) ∼23 million years ago was a critical global climatic change, involving Mi1 glaciation and later recovery. Multi-proxy, high-resolution investigation into foraminiferal assemblages from the offshore Nile Delta in the eastern Mediterranean (PFMD-2R well) reconstructs significant regional late Oligocene to Miocene paleoenvironmental change. We report a marked postglacial warming and a significant increase in nutrient availability from the cool, oligotrophic, low-oxygen Chattian conditions characterised by stressed assemblages with <i>Globigerina glutinata</i> to the warm, extremely productive, well-oxygenated Burdigalian with diverse tropical–subtropical species such as <i>Paragloborotalia semivera</i>. The Aquitanian is characterised as a dynamic, transitory phase. Planktonic foraminifers were resilient, exhibiting high diversity throughout. Conversely, benthic assemblages were radically compromised in the Chattian, recovering later and indicative of a foundational inequality in ecosystem sensitivity. Paradoxically, this recovery correlated with a general shallowing trend of the water depth. Multivariate analyses affirm significant ecological reshaping attributable to post-Mi1 climatic restoration. These semi-restricted-basin findings document the sophisticated interaction between global climatic forcing and regional responses in the ocean, stressing divergent biota recovery pathways between pelagic and ground-dwelling biota.</p>\u0000 </div>","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"100 4","pages":"1308-1327"},"PeriodicalIF":2.1,"publicationDate":"2026-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148823174","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

Origin and Magmatic Evolution Characteristics of the Dala Granite in the Eastern Himalayas: Evidence From Plagioclase and Mica Mineralogy 东喜马拉雅达拉花岗岩成因及岩浆演化特征：来自斜长石和云母矿物学的证据

IF 2.1 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2026-08-28 Epub Date: 2026-08-06 DOI: 10.1111/1755-6724.70091

Hang Liu, Wenchang Li, Huawen Cao, Xiangfei Zhang, Ling Xing, Haoran Chen

{"title":"Origin and Magmatic Evolution Characteristics of the Dala Granite in the Eastern Himalayas: Evidence From Plagioclase and Mica Mineralogy","authors":"Hang Liu, Wenchang Li, Huawen Cao, Xiangfei Zhang, Ling Xing, Haoran Chen","doi":"10.1111/1755-6724.70091","DOIUrl":"https://doi.org/10.1111/1755-6724.70091","url":null,"abstract":"<div>\u0000 \u0000 <p>Magmatic rocks with adakite affinity are used to constrain crustal thickness. Eocene adakitic rocks were recently discovered in the eastern Himalayas. However, both the timing and evidence of crustal thickening and the petrogenetic origin of adakitic rocks remain contentious. The Dala two-mica granite was analysed using zircon/monazite U–(Th)–Pb dating, Hf isotopes, whole-rock major/trace elements and feldspar/mica electron microprobes. Granite was emplaced ca. 41 Ma. It had high SiO<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub> and K<sub>2</sub>O contents, classified as high-potassium, calc-alkaline, peraluminous granite, with adakitic signatures; enriched large-ion lithophile elements (LILEs, e.g., Ba, Sr), depleted high-field-strength elements (HFSEs, e.g., Nb, Ta, Zr, Y) and weak or no Eu anomalies. Depletions in Nb/U, Nd/Sm, MgO, Mg<sup>#</sup>, Cr, Ni, plus zircon <i>ε</i><sub>Hf</sub>(<i>t</i>) values (−25.7 to −7.1, average −10.8) and two-stage depleted mantle model ages (<i>T</i><sub>DM2</sub>, 1562–2723 Ma) indicate an origin of ancient thickened lower crust. The study confirmed that granite formed via partial melting of the thickened lower crust, with melt formation linked to fluid-present muscovite melting. It may have experienced biotite metasomatism during its ascent, with the Himalayan crust reaching a thickness of ∼50 km in the early Eocene.</p>\u0000 </div>","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"100 4","pages":"1105-1125"},"PeriodicalIF":2.1,"publicationDate":"2026-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148823190","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

Genesis of Chromitites From the Mantle and Crust–Mantle Transition Zone: Constraints From the Bursa Ophiolite, NW Turkey 地幔和壳幔过渡带铬铁矿成因：来自土耳其西北部Bursa蛇绿岩的约束

IF 2.1 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2026-08-28 Epub Date: 2026-08-03 DOI: 10.1111/1755-6724.70086

Peng Gao, Jingsui Yang, Osman Parlak, Rendeng Shi, Dongyang Lian, Pengjie Cai

{"title":"Genesis of Chromitites From the Mantle and Crust–Mantle Transition Zone: Constraints From the Bursa Ophiolite, NW Turkey","authors":"Peng Gao, Jingsui Yang, Osman Parlak, Rendeng Shi, Dongyang Lian, Pengjie Cai","doi":"10.1111/1755-6724.70086","DOIUrl":"https://doi.org/10.1111/1755-6724.70086","url":null,"abstract":"<div>\u0000 \u0000 <p>Ophiolitic chromitites are critical archives of mantle melt transport and ore formation in supra-subduction zone (SSZ) settings, occurring as two distinct ore styles: mantle-hosted podiform and crust–mantle transition zone (CMTZ)-hosted stratiform-like orebodies. However, their genetic linkage remains poorly constrained. The Bursa ophiolite, northwestern Turkey, exposes complementary levels of a single oceanic lithospheric mantle section across the Harmancik and Orhaneli massifs, enabling forearc melt evolution to be traced from deep mantle reaction channels to shallow CMTZ melt-focusing systems. Harmancik comprises fertile lherzolites recording 6%–13% partial melting and refractory harzburgites recording 15%–20% melting, both overprinted by migrating forearc melts and associated with replacive dunite channels and podiform chromitites. In contrast, Orhaneli exposes CMTZ dunite–chromitite assemblages and ultramafic–mafic cumulates, recording shallow melt focusing, magmatic differentiation, and in situ crystal accumulation. These observations suggest that the Bursa chromitites represent a vertically linked ore-forming system in which mantle-hosted podiform chromitites formed in reaction channels, whereas CMTZ-hosted stratiform-like chromitites formed during upward melt focusing, differentiation, fractional crystallisation, cumulus processes, and multistage melt percolation.</p>\u0000 </div>","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"100 4","pages":"1063-1085"},"PeriodicalIF":2.1,"publicationDate":"2026-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148823197","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

Mantle Sources and Petrogenesis of Cenozoic Basalts in Minqing Area of Fujian Province, SE China 福建闽清地区新生代玄武岩地幔源与成因

IF 2.1 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2026-08-28 Epub Date: 2026-08-06 DOI: 10.1111/1755-6724.70092

Liyuan Wang, Junfeng Yin, Chensheng Wang, Wenhui Zhang, Jing Xu, Wen Jiang, Taiping Zhao

{"title":"Mantle Sources and Petrogenesis of Cenozoic Basalts in Minqing Area of Fujian Province, SE China","authors":"Liyuan Wang, Junfeng Yin, Chensheng Wang, Wenhui Zhang, Jing Xu, Wen Jiang, Taiping Zhao","doi":"10.1111/1755-6724.70092","DOIUrl":"https://doi.org/10.1111/1755-6724.70092","url":null,"abstract":"<div>\u0000 \u0000 <p>Cenozoic intraplate basalts in SE China provide a crucial window into deep mantle recycling and Palaeo-Pacific plate subduction dynamics. However, the petrogenesis of the transitional ‘central belt’ remains poorly constrained compared to its coastal and inland counterparts, hindering a comprehensive understanding of the lithospheric mantle beneath South China. This study presents new high-precision <sup>40</sup>Ar‒<sup>39</sup>Ar geochronological, geochemical and Sr‒Nd‒Pb isotopic data for alkaline basalts from Minqing, Fujian. Dating yields a plateau age of 13.15 ± 0.92 Ma, establishing a distinct coastal-to-inland younging trend driven by slab rollback. Geochemically, these basalts exhibit ocean island basalt (OIB)-like trace element patterns with pronounced negative Ti and K anomalies, alongside high Zr/Hf ratios. These geochemical fingerprints strongly indicate the involvement of recycled sedimentary carbonate components in the mantle source. Sr‒Nd‒Pb isotopic compositions reveal mixing between depleted mantle (DM) and enriched mantle II (EM2) end-members. Quantitative trace element modelling demonstrates that these basalts originated from a hybrid source dominated by carbonated garnet pyroxenite with minor garnet peridotite. We propose that this mantle source was metasomatised by carbonate-rich melts derived from the subducted Palaeo-Pacific slab within the Big Mantle Wedge (BMW). This mechanism highlights the crucial role of deep carbon recycling in generating subcontinental mantle chemical heterogeneity.</p>\u0000 </div>","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"100 4","pages":"1086-1104"},"PeriodicalIF":2.1,"publicationDate":"2026-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148823241","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

Petrogenetic Evolution of Pleistocene Alkaline Basanites of Harrat Dahrat Humayyan, Northeast Arabian Shield, Saudi Arabia 沙特阿拉伯阿拉伯盾东北部哈拉特达赫拉特胡马扬地区更新世碱性玄武岩的成岩演化

IF 2.1 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2026-08-28 Epub Date: 2026-05-30 DOI: 10.1111/1755-6724.70072

Waheed Elwan, Shehta E. Abadallah, Mohamed M. Abu Anbar, Shehata Ali, Mabrouk Sami, Esam S. Farahat, Basma A. A. Balboul, Khuloud N. Alrashidi

{"title":"Petrogenetic Evolution of Pleistocene Alkaline Basanites of Harrat Dahrat Humayyan, Northeast Arabian Shield, Saudi Arabia","authors":"Waheed Elwan, Shehta E. Abadallah, Mohamed M. Abu Anbar, Shehata Ali, Mabrouk Sami, Esam S. Farahat, Basma A. A. Balboul, Khuloud N. Alrashidi","doi":"10.1111/1755-6724.70072","DOIUrl":"https://doi.org/10.1111/1755-6724.70072","url":null,"abstract":"<div>\u0000 \u0000 <p>This study addresses the origin and evolution of Early Pleistocene basanites from Harrat Dahrat Humayyan (HDH) in the northeastern Arabian Shield, part of the Hutaymah volcanic field. Integrated mineralogical, geochemical and thermobarometric data are used to constrain magma genesis and mantle source characteristics beneath the Arabian Plate. The HDH basanites display features typical of anorogenic alkaline volcanism associated with continental rifting. Thermobarometric estimates indicate crystallization temperatures of 1420–714°C and pressures of 3.1–0.4 GPa, with early olivine crystallization followed by clinopyroxene and feldspar. Trace element modelling suggests that the magmas were derived from low degree partial melting (7%–12.5%) of a heterogeneous garnet–spinel peridotite mantle source. The rocks are enriched in incompatible elements and show rare-earth element (REE) patterns consistent with limited crustal contamination, implying rapid magma ascent. Their prevalent mantle (PREMA)-like geochemical signatures resemble those of other Cenozoic intraplate volcanic provinces in Arabia and elsewhere. These signatures are best explained by melting of a fusible mantle domain triggered by lithospheric extension associated with Red Sea rifting. Overall, the results support a model of passive mantle upwelling beneath an extending lithosphere and provide new insights into mantle heterogeneity and melting processes.</p>\u0000 </div>","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"100 4","pages":"1026-1044"},"PeriodicalIF":2.1,"publicationDate":"2026-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148823157","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

Palaeogeographic Reconstruction of the Central Altyn Tagh Within Rodinia: Evidence From Detrital Zircon U‒Pb Geochronology and Hf Isotopes in the South Washixia Area, NW, China 罗迪尼亚中阿尔金高原的古地理重建：来自南华盛顿地区碎屑锆石U-Pb年代学和Hf同位素的证据

IF 2.1 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2026-08-28 Epub Date: 2026-07-23 DOI: 10.1111/1755-6724.70083

Shengang Wang, Zhengle Chen, Hailong Huo, Da Zhang, Peng Zhang, Chenghao Li, Huadong Ma, Yong Wang, Wei Wang, Xiaofei Du, Wenbao Wang

{"title":"Palaeogeographic Reconstruction of the Central Altyn Tagh Within Rodinia: Evidence From Detrital Zircon U‒Pb Geochronology and Hf Isotopes in the South Washixia Area, NW, China","authors":"Shengang Wang, Zhengle Chen, Hailong Huo, Da Zhang, Peng Zhang, Chenghao Li, Huadong Ma, Yong Wang, Wei Wang, Xiaofei Du, Wenbao Wang","doi":"10.1111/1755-6724.70083","DOIUrl":"https://doi.org/10.1111/1755-6724.70083","url":null,"abstract":"<div>\u0000 \u0000 <p>The Altyn Tagh region preserves extensive Precambrian terranes, but poor exposure and limited high-precision geochronological and isotopic data have hindered reconstruction of its Meso–Neoproterozoic tectonic affinity within Rodinia. This study presents new detrital zircon U‒Pb geochronological, in situ Hf isotopic and provenance data from the Mesoproterozoic Taxidaban Group and the Neoproterozoic Suoerkuli Group in the Central Altyn Tagh. The Taxidaban Group is characterised by zircon ages mainly between 1.2 and 1.8 Ga, with a dominant peak ca. 1.4 Ga, and its youngest zircon populations constrain a maximum depositional age of 1150–945 Ma. The Suoerkuli Group shows a broadly similar age spectrum and, together with an age of ca. 930 Ma for volcanic rocks at its base, constrains deposition to approximately 930–896 Ma. Lithological associations suggest deposition in a marine to volcano–sedimentary basin setting. Mesoproterozoic detrital zircons are dominated by positive <i>ε</i><sub>Hf</sub>(<i>t</i>) values but also include negative values, suggesting a complex source region involving both relatively juvenile crust and reworked older crust. The detrital zircon age spectra and Hf isotopic characteristics differ from those of the Tarim, North China and Yangtze cratons, but are broadly comparable to those of Laurentia, Baltica and Amazonia, supporting possible palaeogeographic affinity with the Laurentia–Baltica–Amazonia system.</p>\u0000 </div>","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"100 4","pages":"975-993"},"PeriodicalIF":2.1,"publicationDate":"2026-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148823243","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

Architectural Evolution of Sandbodies in an Inland Depression Lacustrine Delta and Response to Base-Level Fluctuations 内陆坳陷湖相三角洲砂体构造演化及其对基准面波动的响应

IF 2.1 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2026-08-28 Epub Date: 2026-07-17 DOI: 10.1111/1755-6724.70088

Xiao Xu, Hongjun Qu, Junxing Zhao, Shuaijie Peng

{"title":"Architectural Evolution of Sandbodies in an Inland Depression Lacustrine Delta and Response to Base-Level Fluctuations","authors":"Xiao Xu, Hongjun Qu, Junxing Zhao, Shuaijie Peng","doi":"10.1111/1755-6724.70088","DOIUrl":"https://doi.org/10.1111/1755-6724.70088","url":null,"abstract":"<div>\u0000 \u0000 <p>The Upper Triassic Yanchang Formation in the southeastern Ordos Basin is a depression-type lacustrine delta system, where strong heterogeneity of delta-front sandbodies hinders hydrocarbon development. We investigated base-level controls on sandbody architecture and developed a quantitative model for tight oil reservoirs. Using core, log, and outcrop data, we established a chronostratigraphic framework of 1.5 long-term and 8 medium-term base-level cycles. The results show systematic sandbody evolution: during early base-level rise, amalgamated multi-storey channel sands developed; during mid-to-late rise, single-storey channel sands interbedded with mudstones formed; at peak rise, thick mudstones with thin sandstones accumulated; during the falling stage, sheet-bar sands developed; and during the rapid fall to early rise, mouth bars were widely distributed. Multiple linear regression (<i>R</i><sup>2</sup> = 0.398, <i>N</i> = 808, <i>p</i> < 0.001) confirms base-level change as the primary control on sandbody differentiation. We propose a predictive model for sandbody distribution in such delta fronts, providing a robust framework for exploration in the Ordos Basin and analogous basins worldwide.</p>\u0000 </div>","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"100 4","pages":"1292-1307"},"PeriodicalIF":2.1,"publicationDate":"2026-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148823180","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

Oxygen Fugacity Differences Between the Tungsten- and Tin-Bearing Magmas During Reduced Magmatic Fractionation: Evidence From Apatite in Guidong and Dayishan Plutons in South China 还原岩浆分选过程中含钨、含锡岩浆氧逸度差异——来自华南桂东和大山岩体磷灰石的证据

IF 2.1 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2026-08-28 Epub Date: 2026-06-09 DOI: 10.1111/1755-6724.70074

Qianqian Zhao, Chunli Guo, Bin Hu, Binwu Zhang, Jianqi Xu, Ke Huang

{"title":"Oxygen Fugacity Differences Between the Tungsten- and Tin-Bearing Magmas During Reduced Magmatic Fractionation: Evidence From Apatite in Guidong and Dayishan Plutons in South China","authors":"Qianqian Zhao, Chunli Guo, Bin Hu, Binwu Zhang, Jianqi Xu, Ke Huang","doi":"10.1111/1755-6724.70074","DOIUrl":"https://doi.org/10.1111/1755-6724.70074","url":null,"abstract":"<div>\u0000 \u0000 <p>Magmatic evolution involves oxygen fugacity (<span></span><math></math>) changes that affect tungsten (W) and tin (Sn) transport and enrichment, but how <span></span><math></math> varies during magmatic fractionation and differentially impacts W–Sn enrichment remains unclear. We studied mineralogical and geochemical compositions of Dayishan (Sn) and Guidong (W) granites in Nanling Range to clarify <span></span><math></math> difference during the magmatic fractionation of W- and Sn-bearing magmas. Both granites are divided into less-fractionated (DYS(Sn)-L and GD(W)-L) and highly fractionated (DYS(Sn)-H and GD(W)-H) groups. The apatites of Dayishan and Guidong granites have low S (4–10 and 4–49 ppm), and the S of apatite from DYS(Sn)-L are higher than those from DYS(Sn)-H, but the S of apatite from GD(W)-L are lower than those from GD(W)-H. The trace element of zircon shows a variation pattern similar to that of apatite: the <span></span><math></math> of GD(W)-L (ΔFMQ = −0.42 to 0.33) is lower than that of GD(W)-H (ΔFMQ = −0.31 to 0.81), but the <span></span><math></math> of DYS(Sn)-L (ΔFMQ = −1.08 to −0.41) is higher than that of DYS(Sn)-H (ΔFMQ = −0.67 to −0.37). Therefore, in a reductive condition, decrease in <span></span><math></math> can help the enrichment of Sn, whereas increase in <span></span><math></math> is favoured by the enrichment of W.</p>\u0000 </div>","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"100 4","pages":"1126-1144"},"PeriodicalIF":2.1,"publicationDate":"2026-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148823298","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