Acta Geologica Sinica ‐ English Edition最新文献_第4页

Formation and Evolution of Submarine Mud Volcanoes and Fluid Seepage Patterns: A Comparative Study in Different Tectonic Settings 海底泥火山的形成演化与流体渗流模式：不同构造背景下的对比研究

IF 2.1 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2026-07-02 Epub Date: 2026-05-13 DOI: 10.1111/1755-6724.70045

Tongzhi Lu, Junsheng Luo, Zhifeng Wan, Juncheng Hu, Xuewan Wu, Bing Zou, Qiqi Chen, Leyao Ran

{"title":"Formation and Evolution of Submarine Mud Volcanoes and Fluid Seepage Patterns: A Comparative Study in Different Tectonic Settings","authors":"Tongzhi Lu, Junsheng Luo, Zhifeng Wan, Juncheng Hu, Xuewan Wu, Bing Zou, Qiqi Chen, Leyao Ran","doi":"10.1111/1755-6724.70045","DOIUrl":"https://doi.org/10.1111/1755-6724.70045","url":null,"abstract":"<div>\u0000 \u0000 As products of deep fluid-tectonic-sedimentary coupling, mud volcanoes have scientific value for oil–gas exploration, indicate neotectonic activity and aid global climate change studies. This study focuses on mud volcanoes in China's offshore areas (northern South China Sea, Okinawa Trough of the East China Sea), investigating tectonic control on their development and fluid activity's impact on shallow gas and gas hydrate accumulation. Through numerical simulation, stress field analysis and comparative geological background analysis, key findings include: (1) Tectonically controlled distribution: strike-slip extensional basins host large mud diapirs, extensional basins small–medium ones and compressional back-arc basins show zonal clustering; intensified tectonic activity exacerbates fluid seepage. (2) Formation relies on coupling of ‘material basis-dynamic conditions-triggering mechanisms’: Early Cenozoic mud-rich strata (material), overpressure (driven by undercompaction/hydrocarbon generation, dynamics), and tectonic/seismic activity (triggers). (3) Fluid seepage correlates with parameters: overpressure coefficient positively correlates with eruption intensity; shallower source layers and increased compressive stress enhance seepage efficiency. (4) Mud volcanoes influence accumulation via ‘gas supply-channel transport-temperature-pressure regulation’, acting as a ‘source-channel-trap’ system to promote enrichment, though deep thermal fluid upwelling may cause hydrate dissociation and hazards. This study elucidates their formation mechanisms and resource-environmental effects, providing theoretical support for deep-water oil–gas exploration and geohazard early warning.\u0000 </div>","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"100 3","pages":"745-763"},"PeriodicalIF":2.1,"publicationDate":"2026-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148357950","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

Structural Evolution and Deformation Conditions Associated With Gold Mineralisation in the Jinshan Gold Deposit, Jiangnan Orogen 江南造山带金山金矿床构造演化及与金矿化相关的变形条件

IF 2.1 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2026-07-02 Epub Date: 2026-05-08 DOI: 10.1111/1755-6724.70051

Zhengxin Peng, Lin Yang, Qingfei Wang, Qiyi Ma, Yongfeng Lin, Xiaojun Qi, Hesen Zhao, Guolong Yan, Huajian Li, Hongfu Wu, Yuling Bai, Zhao Liu

{"title":"Structural Evolution and Deformation Conditions Associated With Gold Mineralisation in the Jinshan Gold Deposit, Jiangnan Orogen","authors":"Zhengxin Peng, Lin Yang, Qingfei Wang, Qiyi Ma, Yongfeng Lin, Xiaojun Qi, Hesen Zhao, Guolong Yan, Huajian Li, Hongfu Wu, Yuling Bai, Zhao Liu","doi":"10.1111/1755-6724.70051","DOIUrl":"https://doi.org/10.1111/1755-6724.70051","url":null,"abstract":"<div>\u0000 \u0000 The structural evolution and deformation conditions of ore-controlling shear zones in the large-scale Jinshan orogenic gold deposit were studied through structural mapping, petrographic analysis and electron backscatter diffraction (EBSD) observation. Four distinct deformation events are identified, including pre-mineralisation ductile deformation (D1 and D2), syn-mineralisation brittle‒ductile shearing (D3) and post-mineralisation brittle faulting (D4). Gold-bearing quartz veins are confined to D3-stage NE–SW-trending shear zones characterised by thrust plus sinistral slip movement under NW–SE-oriented compression. The mineral assemblage includes pyrite, arsenopyrite, chalcopyrite, galena, and native gold associated with quartz-sericite alteration. The quartz can be divided into two groups: pre-mineralisation coarse (>100 µm) grains and gold-related fine (<50 µm) grains. The coarse-grained quartz displays dominant prism <a> and rhomb <a> slip with intermediate- to high-temperature deformation fabrics (400°C–600°C) and has undergone sub-grain rotation recrystallisation after its formation. In contrast, the gold-related quartz distributed along the margins of coarse-grained quartz displays bulging recrystallisation with dominant basal <a> slip, indicating intermediate- to low-temperature conditions (300°C–400°C). The intermediate- to low-temperature gold mineralisation event overprinted earlier intermediate- to high-temperature fabrics. This study highlights that the reactivation of the pre-mineralisation shear zones provided fluid pathways for subsequent auriferous fluid flow and gold deposition.\u0000 </div>","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"100 3","pages":"764-780"},"PeriodicalIF":2.1,"publicationDate":"2026-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148357990","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

Middle Jurassic–Early Cretaceous Intracontinental Compressional Deformation in Beishan, NW China: Insights From Structural Analysis, Seismic Reflection Profiling and Low-Temperature Thermochronology 中侏罗世-早白垩世北山陆内挤压变形：构造分析、地震反射剖面和低温热年代学的启示

IF 2.1 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2026-07-02 Epub Date: 2026-05-13 DOI: 10.1111/1755-6724.70060

Lele Han, Xuanhua Chen, Weicui Ding, Zhaogang Shao, Da Zhang, Kui Liu, Xiang Qin, Ye Wang, Bing Li, Shenglin Xu

{"title":"Middle Jurassic–Early Cretaceous Intracontinental Compressional Deformation in Beishan, NW China: Insights From Structural Analysis, Seismic Reflection Profiling and Low-Temperature Thermochronology","authors":"Lele Han, Xuanhua Chen, Weicui Ding, Zhaogang Shao, Da Zhang, Kui Liu, Xiang Qin, Ye Wang, Bing Li, Shenglin Xu","doi":"10.1111/1755-6724.70060","DOIUrl":"https://doi.org/10.1111/1755-6724.70060","url":null,"abstract":"<div>\u0000 \u0000 The Beishan Fold-Thrust Belt (BFTB), located in the southern part of the Central Asian Orogenic Belt (CAOB), underwent complex intracontinental deformation during the late Mesozoic and is a key tectonic unit for deciphering the remote effects of plate margin orogenesis. In this study, we selected the Yemaquan region in southern Beishan and conducted remote sensing interpretation, field mapping, seismic profile interpretation and low-temperature thermochronological analyses. The Permian pluton and Carboniferous strata thrust over the Jurassic strata and developed a series of SEE-trending thrusts, NE-striking left strike-slip faults, and several SEE- and NE-trending folds. This area experienced two directions (NE and NW) of compression deformation. Under the joint influence of compression stress and pluton blocking, fold structures related to strike-slip faults also developed (the Big Ear syncline). The above constituted the Yemaquan Fold-Thrust system (YFTS). Zircon (U-Th)/He (ZHe) data reveal cooling events at ∼175–165 Ma; combining the regional deformation, it may indicate the compression time. We concluded that the intracontinental deformation of the BFTB in the southern CAOB was driven by the far-field effects. NE compression is related to the closure of the Mongol–Okhotsk Ocean and the collision of the Lhasa–Qiangtang block; NW compression is related to westward subduction of the Paleo-Pacific plate.\u0000 </div>","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"100 3","pages":"576-599"},"PeriodicalIF":2.1,"publicationDate":"2026-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148357949","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

Late Carboniferous–Permian Tectonic Evolution of the Southern Paleo-Asian Ocean: New Insights From Magmatic and Sedimentary Records in the Alxa Area 古亚洲南部晚石炭-二叠世构造演化：阿拉善地区岩浆和沉积记录的新见解

IF 2.1 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2026-07-02 Epub Date: 2026-05-28 DOI: 10.1111/1755-6724.70064

Weidong He, Yunpeng Dong, Jiaopeng Sun, Junxiang Zhang

{"title":"Late Carboniferous–Permian Tectonic Evolution of the Southern Paleo-Asian Ocean: New Insights From Magmatic and Sedimentary Records in the Alxa Area","authors":"Weidong He, Yunpeng Dong, Jiaopeng Sun, Junxiang Zhang","doi":"10.1111/1755-6724.70064","DOIUrl":"https://doi.org/10.1111/1755-6724.70064","url":null,"abstract":"<div>\u0000 \u0000 The Late Carboniferous–Permian magmatic and sedimentary records in the Alxa area are crucial to understanding the tectonic evolution of the Paleo-Asian Ocean. We present petrological, whole-rock geochemical, zircon U-Pb geochronological and Hf isotopic data for magmatic and siliciclastic rocks from northern Alxa. Rhyolite and granite porphyry related to the Amushan Formation crystallized at ca. 309–304 Ma, derived from juvenile to moderately evolved lower crust reworked by oceanic subduction. Sandstones from the Quagan Qulu and Engger Us tectonic belts display contrasting detrital-zircon age spectra. Quagan Qulu samples, characterized by an early Paleozoic peak at ca. 430 Ma, record mixed input from early Paleozoic arc rocks, Precambrian basement and recycled cover strata, whereas Engger Us samples are dominated by a Devonian peak at ca. 381 Ma and were supplied by a nearby Devonian arc source. Together with published data, our results support a segmented Late Carboniferous–Permian forearc–arc–retroarc system along the northern margin of Alxa. Continued southward subduction of the Quagan Qulu oceanic lithosphere beneath the Nuru–Langshan continental arc is the preferred interpretation, whereas Late Carboniferous to early Permian slab rollback is a plausible mechanism for the ensuing magmatic flare-up, arc uplift and provenance shift.\u0000 </div>","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"100 3","pages":"511-538"},"PeriodicalIF":2.1,"publicationDate":"2026-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148358224","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

Present-Day Structural Deformation and Stress Regime in the Southern Sichuan Basin, China: Insights From Deep Geophysical Data and Numerical Modelling 四川盆地南部现今构造变形和应力状态：来自深部地球物理资料和数值模拟的启示

IF 2.1 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2026-07-02 Epub Date: 2026-05-09 DOI: 10.1111/1755-6724.70049

Huiju Shi, Lin Wu, Shuwei Guan, Peng Xia, Yuyang Liu, Zhuliang Qian

{"title":"Present-Day Structural Deformation and Stress Regime in the Southern Sichuan Basin, China: Insights From Deep Geophysical Data and Numerical Modelling","authors":"Huiju Shi, Lin Wu, Shuwei Guan, Peng Xia, Yuyang Liu, Zhuliang Qian","doi":"10.1111/1755-6724.70049","DOIUrl":"https://doi.org/10.1111/1755-6724.70049","url":null,"abstract":"<div>\u0000 \u0000 The Sichuan Basin, adjacent to the Himalayas in China, exhibits complex structural deformation and stress regimes, necessitating systematic structural and stress analysis. The Luzhou region in the southern Sichuan Basin is cut by three sets of faults, which trend NNE (NE)–SSW (SW), E (NEE)–W (SWW), and N (NNW)–S (SSE). Late Ordovician to early Silurian strata lie between the basement and cover sequences, and the faults are mainly extrusion thrust faults. Integrated geophysical data and finite element numerical modelling reveal that the maximum horizontal principal stress (SH) is 76–131 MPa, the minimum horizontal principal stress (Sh) is 64–113 MPa, and the vertical stress (Sv) is 69–125 MPa, consistent with a strike-slip regime (SH > Sv > Sh). Consequently, the present-day stress regime differs from that of existing thrust-fault models. The NNE (NE)–SSW (SW) trending faults have the greatest impact on the magnitude and orientation of the stress, and the E (NEE)–W (SWW) faults have the greatest impact on the horizontal stress differences (ΔS). ΔS is negatively correlated with the total gas content and negatively correlated with borehole deformation in seven wells in the Luzhou region; therefore, E (NEE)–W (SWW) trending faults should be avoided during petroleum exploration in the Luzhou region.\u0000 </div>","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"100 3","pages":"600-615"},"PeriodicalIF":2.1,"publicationDate":"2026-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148358073","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

Zircon U–Pb Age and Lu–Hf Isotopic Constraints on Granodioritic Rocks From the Qaradagh Batholith (NW Iran): Implications for Paleogene Magmatism in Northwest Iran and Southern Armenia 伊朗北部Qaradagh岩基花岗闪长岩的锆石U-Pb年龄和Lu-Hf同位素约束：对伊朗西北部和亚美尼亚南部古近系岩浆活动的指示意义

IF 2.1 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2026-07-02 Epub Date: 2026-05-14 DOI: 10.1111/1755-6724.70059

Vartan Simmonds, Mohssen Moazzen, Gültekin Topuz, Ali Mohammadi, Thomas Zack, Marcel Guillong

{"title":"Zircon U–Pb Age and Lu–Hf Isotopic Constraints on Granodioritic Rocks From the Qaradagh Batholith (NW Iran): Implications for Paleogene Magmatism in Northwest Iran and Southern Armenia","authors":"Vartan Simmonds, Mohssen Moazzen, Gültekin Topuz, Ali Mohammadi, Thomas Zack, Marcel Guillong","doi":"10.1111/1755-6724.70059","DOIUrl":"https://doi.org/10.1111/1755-6724.70059","url":null,"abstract":"<div>\u0000 \u0000 The Qaradagh Batholith in northwestern Iran, adjacent to the Meghri–Ordubad pluton (MOP) within the South Armenian Block, is dominated by granodiorite, which represents its earliest intrusive phase. Both the Qaradagh Batholith and the MOP formed in a subduction-to-post collisional setting linked to the closure of Neo-Tethys Ocean between middle Eocene and early Miocene. U–Pb zircon dating of the granodiorite was conducted to constrain its emplacement age, yielding a 206Pb/238U weighted mean age of 43.81 ± 0.18 Ma and a U–Pb concordia age of 44.04 ± 1.00 Ma, placing intrusion in the middle Eocene, earlier than previously suggested Oligocene ages. In situ zircon Lu–Hf isotope analyses, conducted to determine magma source characteristics, yielded εHf(t) values between +8.7 and +11.1, indicating derivation from a depleted, juvenile mantle source with minimal crustal contamination. This is supported by low initial 87Sr/86Sr (0.7037–0.7041), positive εNd(i) (+2.69) and low zircon U and Th contents relative to Miocene intrusions in NW Iran, which have higher crustal contribution. Model TDM ages of zircons (256–354 Ma) indicate a Carboniferous–Permian source material, consistent with late Paleozoic subduction. These results place the Qaradagh granodiorite among the earliest manifestations of Paleogene magmatism in the region.\u0000 </div>","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"100 3","pages":"708-730"},"PeriodicalIF":2.1,"publicationDate":"2026-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148357951","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

The Neoproterozoic S-Type Granites in the Western Jiangnan Orogen: Petrogenetic and Geodynamic Implications 江南造山带西部新元古代s型花岗岩的成因及地球动力学意义

IF 2.1 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2026-07-02 Epub Date: 2026-05-11 DOI: 10.1111/1755-6724.70055

Ying Gao, Mingda Huang, Mohd Ashraf bin Mohamad Ismail, Junwei Yang, Tao Li, Hongyang Liu, Yuqi Huang, Xianzhao Zhang

{"title":"The Neoproterozoic S-Type Granites in the Western Jiangnan Orogen: Petrogenetic and Geodynamic Implications","authors":"Ying Gao, Mingda Huang, Mohd Ashraf bin Mohamad Ismail, Junwei Yang, Tao Li, Hongyang Liu, Yuqi Huang, Xianzhao Zhang","doi":"10.1111/1755-6724.70055","DOIUrl":"https://doi.org/10.1111/1755-6724.70055","url":null,"abstract":"<div>\u0000 \u0000 The mid-Neoproterozoic tectonic evolution of the western Jiangnan Orogen in the context of the Rodinia supercontinent remains unresolved due to debates regarding the interpretation of the petrogenesis of igneous rocks. In this study, we present an integrated dataset of petrology, whole-rock geochemistry, zircon U-Pb ages, and Hf isotopes for granitic samples from the Fanjingshan area in the western Jiangnan Orogen. LA-ICP-MS zircon U-Pb dating indicates that they crystallised ca. 810 Ma. Whole-rock geochemical data demonstrate that they exhibit typical features of S-type granites and were derived from dehydration melting of a metasedimentary protolith. Zircon εHf(t) values range from −7.9 to 1.6, with a main peak value of −3.5. Two-stage Hf model ages of 1.5–1.9 Ga suggest that these granites were derived from ancient crustal materials. Extensive fractional crystallisation and magmatic–hydrothermal interactions are inferred from low rare earth element (REE) contents, low Nb/Ta and Zr/Hf ratios, and a distinct REE tetrad effect. Combined with coeval arc-related magmatism and rift basins, the Fanjingshan granites were most likely emplaced in a back-arc setting. Available data indicate that rift basins occurred extensively at the periphery of the Yangtze Block ca. 810 Ga, implying their involvement in the breakup of the Rodinia supercontinent.\u0000 </div>","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"100 3","pages":"673-687"},"PeriodicalIF":2.1,"publicationDate":"2026-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148358188","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

Deciphering Magma Mingling Processes in the Zouzan Pluton, Eastern Iran: Multi-Method Constraints From Zircon Geochronology, Nd-Sr Isotopes and Amphibole-Apatite Chemistry on Mafic Enclave Formation 解读伊朗东部琐赞岩体岩浆混合过程：锆石年代学、Nd-Sr同位素和闪石-磷灰石化学对基性包裹体形成的多重约束

IF 2.1 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2026-07-02 Epub Date: 2026-05-11 DOI: 10.1111/1755-6724.70056

Seyed Ali Mazhari, Santosh Kumar

{"title":"Deciphering Magma Mingling Processes in the Zouzan Pluton, Eastern Iran: Multi-Method Constraints From Zircon Geochronology, Nd-Sr Isotopes and Amphibole-Apatite Chemistry on Mafic Enclave Formation","authors":"Seyed Ali Mazhari, Santosh Kumar","doi":"10.1111/1755-6724.70056","DOIUrl":"https://doi.org/10.1111/1755-6724.70056","url":null,"abstract":"<div>\u0000 \u0000 The Zouzan pluton in the Lut Block (eastern Iran) comprises coeval gabbro–diorite and felsic intrusions that contain abundant mafic enclaves (MEs). Integrated zircon U-Pb dating, whole-rock Sr-Nd isotopes and amphibole-apatite chemistry are used to investigate ME formation. Zircon ages indicate synchronous emplacement of the gabbro–diorite, MEs, and granodiorite ca. 40 Ma. The MEs plot along a Sr-Nd isotopic mixing line between mantle-derived gabbro–diorite and more crustally contaminated granodiorite, supporting a magma-mixing origin. Mineral chemistry, however, reveals more complex interactions. Apatite in MEs is acicular with trace element compositions intermediate between those of mafic and felsic magmas, indicating rapid crystallisation from a hybrid melt. Amphiboles display two distinct compositional groups: one matching gabbro–diorite amphiboles and the other resembling those in the granodiorite. This bimodality suggests that ME formation involved incomplete mixing, crystal transfer between magmas and variable re-equilibration rather than simple hybridisation. A dynamic model is proposed in which mafic magma globules were injected into a partly crystallised felsic chamber, producing mingling, quenching and crystal exchange that ultimately shaped the petrographic and geochemical features of the Zouzan pluton.\u0000 </div>","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"100 3","pages":"688-707"},"PeriodicalIF":2.1,"publicationDate":"2026-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148358190","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

Zircon U-Pb Geochronology of the Quartzite Unit in the Eastern Himalayan Syntaxis and Its Implications for Tectonic Affinity 东喜马拉雅造合带石英岩单元锆石U-Pb年代学及其构造亲和性意义

IF 2.1 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2026-07-02 Epub Date: 2026-05-28 DOI: 10.1111/1755-6724.70070

Bowen Zhou, Lin Ding, Jinxiang Li, Chao Wang, Zheng Yin, Guanglong Deng, Yahui Yue, Fulong Cai

{"title":"Zircon U-Pb Geochronology of the Quartzite Unit in the Eastern Himalayan Syntaxis and Its Implications for Tectonic Affinity","authors":"Bowen Zhou, Lin Ding, Jinxiang Li, Chao Wang, Zheng Yin, Guanglong Deng, Yahui Yue, Fulong Cai","doi":"10.1111/1755-6724.70070","DOIUrl":"https://doi.org/10.1111/1755-6724.70070","url":null,"abstract":"<div>\u0000 \u0000 The tectonic affinity of the quartzite unit is essential for reconstructing the Cenozoic evolution of the Eastern Himalaya Syntaxis. We presented new petrographic and zircon U-Pb geochronological data from the quartzite unit collected from the western boundary of the Namche Barwa syntaxis. The maximum depositional ages indicated multiple depositional stages at >1800, 1122–1136, 885, 451–493 and 54 Ma. Detrital zircon ages spanned from 50 to 3269 Ma with dominant populations at 500–900, 950–1400, 1550–1700 and 1750–2000 Ma. These age distributions suggested that the detritus were derived mainly from the Central Indian Tectonic Zone, Shillong Plateau and the Eastern Ghats Orogeny of the northeastern Indian subcontinent, and Western Australia. This provenance signature was distinct from the typical sequences of the Lesser Himalayan Sequence, Greater Himalayan Sequence and Tethyan Himalayan Sequence in the central–western Himalayas. Integrating our results with existing data from the Nyingchi Complex in the southern Lhasa terrane and Lesser Himalayan Sequence in the Eastern Himalayan Syntaxis, we proposed that the Namche Barwa syntaxis, Nyingchi Complex and Lesser Himalayan Sequence shared common source regions. Long-lived fluvial systems likely transported detrital material from northwestern Australia and the northeastern Indian subcontinent to these tectonic units.\u0000 </div>","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"100 3","pages":"731-744"},"PeriodicalIF":2.1,"publicationDate":"2026-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148358226","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

Control of Sub-Crustal Mush Dynamics on 3D Stress Fields in Mid-Ocean Ridges: An FSI Modelling Approach 中洋脊三维应力场的地壳下糊状动力学控制：FSI模拟方法

IF 2.1 3区地球科学

Acta Geologica Sinica ‐ English Edition Pub Date : 2026-07-02 Epub Date: 2026-05-11 DOI: 10.1111/1755-6724.70050

Joyjeet Sen, Shamik Sarkar, Nibir Mandal

{"title":"Control of Sub-Crustal Mush Dynamics on 3D Stress Fields in Mid-Ocean Ridges: An FSI Modelling Approach","authors":"Joyjeet Sen, Shamik Sarkar, Nibir Mandal","doi":"10.1111/1755-6724.70050","DOIUrl":"https://doi.org/10.1111/1755-6724.70050","url":null,"abstract":"<div>\u0000 \u0000 Using a novel thermo-mechanical model, this study explores the role of multi-ordered 3D convective dynamics of the mushy region in modulating the strongly heterogeneous stress fields in mid-ocean ridge (MOR) systems. This model couples the sub-ridge mushy (fluid) regions with the elastic (solid) crustal layer within a mathematical framework of fluid–structure interaction (FSI) mechanics. Model-based calculations of the total stress tensor provide quantitative estimates of the across- and along-axis horizontal tension/compression (<math></math> and σ∥) and across-axis horizontal shear stress (σ#) that dominantly control the ridge-axis morphologies. The stress analysis forms an alternative explanation for the off-axis ridge-parallel second-order hill topography, located at a distance of 20–50 km. This study also shows how along-axis compressional σ∥ can localise a row of ridge-normal narrow, 10–30 km wide stripes on a wavelength of 40–150 km. Their overall patterns conform to the second-order magmatic segmentation structures of MORs. The σ# mapping suggests that ridge-transverse discontinuities, including transform offsets, transpression and transtension zones, originate spontaneously from FSI interactions during MOR evolution. The article finally presents a set of MOR examples from modern plate tectonic settings to support model interpretations.\u0000 </div>","PeriodicalId":7095,"journal":{"name":"Acta Geologica Sinica ‐ English Edition","volume":"100 3","pages":"616-636"},"PeriodicalIF":2.1,"publicationDate":"2026-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148358220","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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