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An Intra-Oceanic subduction System Influenced by ridge subduction in the Diyanmiao subduction Accretionary Complex of the Xar Moron Area,Eastern Margin of the Central Asian Orogenic Belt

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Journal of Earth Science 2021年第1期32卷 253-266页

作者： Yang Cheng Qinghui Xiao Tingdong Li Liquan Xu Yuxu Fan Yan Li Lingjun Guo Jinli Pang Weiming Yuan Institute of Mineral Resources Research China Metallurgical Geology BureauBeijing 101300China Institute of Geology Chinese Academy of Geological SciencesBeijing 100037China Inner Mongolia Key Laboratory of Magmatic Mineralization and Ore-Prospecting Hohhot 010020China General Prospecting Institute China National Administration of Coal GeologyBeijing 100039China

This study focuses on the geology,geochemistry,Sr-Nd isotopes and their tectonic settings of three types of basalts in Diyanmiao ophiolite in the Xar Moron area located on the eastern margin of the Central Asian Orogenic *** I basalts are oceanic tholeiites with a depleted light rare earth element(LREE)pattern,which are similar to the typical N-mid-oceanic ridge basalt(MORB)and suggests that they were formed at a mid-oceanic *** initial 87Sr/86Sr ratios of Type I basalts range from 0.703966 to 0.705276 and theεNd(t)values are from 16.49 to 17.15,indicating that they were derived from a depleted mantle *** II basalts belong to the medium-potassium calc-akaline series and have the geochem-ical characteristics of Nb-enriched basalt(NEB)with high Nb content(14.5 ppm)and strong enrichment in LREEs,implying that they were created by the partial melting of mantle wedge peridotite that previously metasomatized by slab *** III basalts are high-Al basalt(HAB)with high-Al contents(Al_(2)0_(3)=16.75 wt.%-18.00 wt.%),distinct Nb depletion and high Th/Yb *** they were likely gen-erated in a normal island-arc ***,the association of MORB,NEB,and HAB in the study area may be due to the subduction of a mid-oceanic ridge,and the Diyanmiao ophiolite is proposed to be formed in the forearc setting of a mid-oceanic ridge subduction system.

关键词： mid-oceanic ridge basalt Nb-enriched basalt high-Al basalt ridge subduction Diyanmiao ophiolite Inner Mongolia

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Carboniferous ridge subduction in the Xingmeng Orogenic Belt:Constraints from geochronological,geochemical,and Sr-Nd-Hf isotopic analysis of strongly peraluminous granites and gabbro-diorites in the Xilinhot micro-continent

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Geoscience Frontiers 2021年第3期12卷 314-332页

作者： Changfeng Liu Zhiguang Zhou Guosheng Wang Chen Wu Hongying Li Shiwei Ma School of Ocean Sciences China University of Geosciences(Beijing)Beijing 100083China School of Earth Science and Resources China University of Geosciences(Beijing)Beijing 100083China Key laboratory of Continental Collision and Plateau Uplift Institute of Tibetan Plateau Researchand Center for Excellence in Tibetan Plateau Earth SciencesChinese Academy of SciencesBeijing 100101China Sichuan University of Science&Engineering ZigongSichuan 643002China Beijing No.11 High School Beijing100062 China

The Xingmeng Orogenic Belt evolved through a long-lived orogeny involving multiple episodes of subduction and ***,there is a debate on its tectonic evolution during the Late ***,we report geochemical,geochronological,and isotopic data from strongly peraluminous granites and gabbro-diorites from the Sunidzuoqi-Xilinhot *** U-Pb ages suggest that the intrusive rocks were emplaced during the Early Carboniferous(333-322 Ma).The granites exhibit geochemical characteristics similar to S-type granites,with high SiO_(2)(72.34-76.53 wt.%),Al_(2)O_(3)(12.45-14.65 wt.%),and A/CNK(1.07-1.16),but depleted Sr,Nb,and Ta *** exhibit positiveε_(Nd)(t)andε_(Hf)(t)values(-0.3 to 2.8 and 2.7-5.7,respectively)and young Nd and Hf model ages(T_(DM2)(Nd)=853-1110 Ma and T_(DM2)(Hf)=975-1184 Ma),suggesting that they may be the partial melting products of heterogeneous sources with variable proportions of pelite,psammite,and metabasaltic *** meta-gabbro-diorites from the Maihantaolegai pluton have low SiO_(2)(47.06-53.49 wt.%)and K_2O(0.04-0.99 wt.%)contents,and demonstrate slight light rare earth element(REE)depletion in the chondritenormalized REE *** have high zirconε_(Hf)(t)values(14.41-17.34)and young Hf model ages(T_(DM2)(Hf)=230-418 Ma),indicating a more depleted mantle *** variations of the Sm/Yb and La/Sm ratios can thus be used to assess the melting degree of the mantle source from 5%to 20%,suggesting a quite shallow mantle melting *** propose that the petrogenesis and distribution of the strongly peraluminous granites and gabbro-diorites,as well as the tectonic architecture of the region,can be explained by a ridge subduction *** on these results,and previous studies,we suggest a southward ridge subduction model for the Sunidzuoqi-Xilinhot region.

关键词： Strongly peraluminous granites Gabbro-diorite Xingmeng Orogenic Belt Carboniferous ridge subduction

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Geochemistry and genesis of the Nadun Nb-enriched arc basalt in the Duolong mineral district,western Tibet:Indication of ridge subduction

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Geoscience Frontiers 2022年第1期13卷 230-243页

作者： Tian-Yu Zhang Jianghong Deng Ming Wang Cai Li Lipeng Zhang Weidong Sun Center of Deep Sea Research Institute of OceanologyCenter for Ocean Mega-ScienceChinese Academy of SciencesQingdao 266071China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China College of Earth Sciences Jilin UniversityChangchun 130061China School of Marine Sciences University of Chinese Academy of SciencesBeijing 100049China

The Duolong mineral district in western Tibet is one of the largest porphyry Cu–Au deposit fields with significant metallogenic potential in *** tectonic environment relevant to Early Cretaceous Cu–Au mineralization remains *** we report new whole-rock major and trace element,and Sr-Nd-Hf-Pb isotopic data for the newly discovered basalt in the Nadun area,Duolong mineral district,to decipher their genesis and further constrain the tectonic environment.A contemporaneous rhyolite sample interbedded with the basalt in the lower part of the volcanic section in the Nadun area yields an LA-ICP-MS zircon U–Pb age of 122.5±1.2 *** basalt samples exhibit high-K calc-alkaline/shoshonite properties and are enriched in high field strength elements,e.g.,high Ti O_(2)(1.43–1.79 wt.%)and Nb(14.6–19.5 ppm)contents,with high Nb/La ratios(0.4–0.6),which are compositionally comparable to those of Nb-enriched arc basalts(NEABs).The(^(87) Sr/^(86) Sr)iratios of 0.7052 to 0.7056,negative eNd(t)(-0.7 to-0.2)and eHf(t)values(+6.0 to+6.5),and high(^(206) Pb/^(204)Pb)i,(^(207) Pb/^(204)Pb)i,(^(208) Pb/^(204)Pb)iand ratios(18.522 to 18.561,15.641 to 15.645 and 38.679 to 38.730,respectively)suggest that the Nadun NEABs are more enriched than those of the island arc basalts(IABs)in the *** slightly enriched radiogenic isotopes for the Nadun NEABs indicate that the subducting sediments play an important role in the ***,their high Nb,Ti,and Cu contents indicate that the source mantle wedge was metasomatized by slab *** Nadun NEAB and other coeval magmatic rocks in the Duolong mineral district,including adakite,OIB-like basalt,MORB-type basalt,A-type rhyolite,and common IAB,are typical rock assemblages of ridge *** infer that the Duolong mineral district were formed by ridge subduction in the Early Cretaceous.

关键词： Tibet Duolong porphyry Cu-Au deposit Nb-enriched arc basalt Tethys ocean ridge subduction

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Yangshan A-Type Granites in the Lower Yangtze River Belt Formed by ridge subduction:Radiogenic Ca and Nd Isotopic Constraints

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Journal of Earth Science 2022年第3期33卷 581-590页

作者： Jianghao Bai Mingxing Ling Xiaoyong Yang Fang Liu Huangling Gu Zebin Luo Xiaoyan Jiang Zhaofeng Zhang State Key Laboratory of Isotope Geochemistry Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China CAS Center for Excellence in Deep Earth Science Guangzhou 510640China State Key Laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China Key Laboratory of Crust-Mantle Materials and Environments School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China International Research Center for Planetary Science College of Earth SciencesChengdu University of TechnologyChengdu 610059China School of City and Environment Hunan University of TechnologyZhuzhou 412007China State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China University of Chinese Academy of Sciences Beijing 100049China

The Early Cretaceous aluminous A-type granites in the Lower Yangtze River belt(LYRB)can provide important insights into the Mesozoic magmatism in eastern China,but their origin remains highly *** this study,radiogenic Ca-Nd isotopic analysis was performed for syenite porphyry and alkali-feldspar granite porphyry of the Yangshan pluton,a typical aluminous A-type granitic intrusion in the LYRB,to constrain its source and geodynamic *** results show thatε_(Ca)(126 Ma),ε_(Nd)(126 Ma)and K/Ca_(source) of the syenite porphyry range from-0.24 to+0.96,-7.2 to-6.0,and 0.31 to 1.26,*** corresponding values for the alkali-feldspar granite porphyry range from 0.26 to 0.84,-8.0 to-6.1,and 0.79 to 1.08,*** mixing modeling indicates that they were originated from the same sources with different proportion,namely,a mixing of 50%to 75%Neoproterozoic crust and 50%to 25%asthenospheric *** with previous works,we propose that the Early Cretaceous subduction of the ridge between the Pacific and Izanagi plates was responsible for the formation of the aluminous A-type granites in the LYRB.

关键词： Lower Yangtze River belt(LYRB) aluminous A-type granite Yangshan pluton radiogenic Ca-Nd isotopes ridge subduction geochemistry

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Petrogenesis of Late Paleoproterozoic Liangcheng charnockites and S-type granites in the central-northern margin of the North China Craton:Implications for ridge subduction

Petrogenesis of Late Paleoproterozoic Liangcheng charnockite...

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中国科学院地质与地球物理研究所2012年度（第12届）学术年会

作者： P.Peng J.H.Guo B.F.Windley F.Liu Z.Chu M.G.Zhai State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences Department of Geology University of Leicester

The 1930-1890Ma,garnet-bearing,peraluminous,Liangcheng granitoids are mainly distributed in the Fengzhen belt in the North China Craton(NCC).They consist of early porphyritic,coarse-grained charnockites(magmatic orthopyroxene granitic rocks) and late,medium- to coarse-grained S-type, crustal-melt *** charnockites are distinguished from the S-type granites by their higher TiO,AlO,FeO,MgO,CaO,and trace element contents,especially the heavy rare earth elements (REE).The charnockites show varied light-REE enrichments(La/Yb = 1.92-18.0),negative Eu anomalies (Eu/Eu = 0.2-0.9),and negative anomalies in high field strength elements(HFSEs,e.g.,Nb,Ta,Ti) and in Sr,compared with the neighbouring elements in *** Sr/Sr(t= 1900 Ma) ratios vary from 0.704 to 0.707,with one at 0.74,andεNd(t= 1900 Ma) values range from -4 to +*** contrast, the Liangcheng S-type granites show strong light-REE enrichments(La/Yb = 13.3-230),positive Eu anomalies(Eu/Eu = l.l-3.6),negative anomalies in HFSEs(e.g.,Nb,Ta,Ti) and negative or positive anomalies in Sr,compared with neighbouring elements in *** Sr/Sr(t= 1900Ma) ratios vary from 0.703 to 0.712,andεNd(t= 1900 Ma) values range from -3 to+*** the charnockites and S-type granites originated by melting of in situ meta-sediments with significant(charnockites) or little(S-type granites) amounts of additional melts from the parental magma of the adjacent Xuwujia ***-Mg(19-23 wt.%) samples of the Xuwujia gabbronorites have whole-rock Re contents of 0.16-1.93 ppb,OS contents of 1.6-9.8 ppb,Re/Os ratios of 0.08-1.76,and Os/Os ratios of 0.1168-0.1186(with one exception at 0.1845).These values are comparable with those of typical komatiites,and agree with a depleted source for these *** charnockites have received 10-30 wt.% or even larger amounts of melt contribution from the Xuwujia gabbronorites,whereas the S-type granites received only few melts from the gabbronorites,and they possibly had lo

关键词： North China Craton Late Paleoproterozoic Gabbronorites-charnockites-S-type granites-volcanics Ultra-high temperature metamorphism ridge subduction

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Halaqin volcano-sedimentary succession in the central-northern margin of the North China Craton:Products of Late Paleoproterozoic ridge subduction

Halaqin volcano-sedimentary succession in the central-northe...

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中国科学院地质与地球物理研究所第11届（2011年度）学术年会

作者： B.F.Windley Department of Geology University ofLeicesterLeicester LE17RHUK

The Halaqin volcano-sedimentary succession(HVSS) is tectonically situated on top of the largely Late Archean to Early Paleoproterozoic Yinshan terrane in the central-northern margin of the North China Craton. It comprises greenschist- to amphibolite-facies schists,quartzites,marbles and amphibolites,which were originally pelites,pebbly sandstones,sandstones,limestones and volcanic *** presence of tight to isoclinal folds and thrusts of the HVSS indicates tectonic transport from southeast to northwest (present coordinates).U-Pb ages of detrital zircon grains in the clastic rocks suggest provenance from both the Fengzhen belt in the south and the Yinshan terrane in the *** U-Pb ages of the HVSS volcanic rocks,e.g.,1909±10 Ma,1894±6 Ma,1887±6 Ma,and 1884±8 Ma indicate volcanism in the period～1910-1880 *** zircon age study of the neighbouring Majiadian Group reveals significant～2700 Ma crust growth and～2500 Ma metamorphism events in the Yinshan *** HVSS volcanic rocks have a trimodal geochemical distribution demonstrated by SiO-contents of 45-50 wt.%(basalts), 53-60 wt.%(andesites),and 70-76 wt.%(dacites-rhyolites).The basalts and andesites are tholeiitic in chemistry,and show distinct depletion in high-field strength elements(HFSE,e.g.,Nb,Zr,Ti),compared to neighbouring elements in ***,low-Mg basalts and andesites(MgO 5 wt.%) have more or less flat REE patterns(La/Yb = 0.45-1.76) and LILE.εNd(t= 1890 Ma) values of the basalts and andesites vary from -4.8 to +*** rhyolites and dacites have strongly enriched light trace element patterns(La/Yb = 8.49-47.9) and LILE,but depleted HFSE (e.g.,Nb,Zr,Ti).The basalts and basaltic andesites most likely originated from the asthenosphere contaminated by melts from the lithosphere,whereas the dacites and rhyolites likely originated from

关键词： North China Craton Late Paleoproterozoic Halaqin volcano-sedimentary succession ridge subduction Ultra-high temperature metamoiphism

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Initiation and evolution of the South China Sea: an overview

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Acta Geochimica 2016年第3期35卷 215-225页

作者： Weidong Sun CAS Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of Sciences CAS Key Laboratory of Mineralogy and Metallogeny Guangzhou Institute of Geochemistry Chinese Academy of Sciences

Different models have been proposed for the formation and tectonic evolution of the South China Sea(SCS), including extrusion of the Indochina Peninsula,backarc extension, two-stage opening, proto-SCS dragging,extension induced by a mantle plume, and integrated models that combine diverse factors. Among these, the extrusion model has gained the most attention. Based on simpli?ed physical experiments, this model proposes that collision between the Indian and Eurasian Plates resulted in extrusion of the Indochina Peninsula, which in turn led to opening of the SCS. The extrusion of the Indochina Peninsula, however, should have led to preferential opening in the west side of the SCS, which is contrary to observations. Extensional models propose that the SCS was a backarc basin, rifted off the South China Block. Most of the backarc extension models, however, are not compatible with observations in terms of either age or subduction direction. The two-stage extension model is based on extensional basins surrounding the SCS. Recent dating results indeed show two-stage opening in the SCS, but the Southwest Subbasin of the SCS is much younger, which contradicts the two-stage extension model. Here we propose a re?ned backarc extension model. There was a wide Neotethys Ocean between the Australian and Eurasian Plates before the Indian-Eurasian collision. The ocean ?oor started to subduct northward at *125 Ma, causing backarc extension along the southern margin of the Eurasian Plate and the formation of the proto-SCS. The Neotethys subduction regime changed due to ridge subduction in the Late Cretaceous, resulting in fold-belts, uplifting, erosion, and widespread unconformities. It may also have led to the subduction of the proto-SCS. Flat subduction of the ridge may have reached further north and resulted in another backarc extension that formed the SCS. The rollback of the?at subducting slab might have occurred *90 Ma ago; the second backarc extension may have initiated betwee

关键词： South China Sea Neotethys Plate subduction ridge subduction Indochina Peninsula extrusion Backarc extension Multiple plate interactions Proto-South China Sea

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Petrogenesis and tectonic implication of lavas from the Yap Trench,western Pacific

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Acta Oceanologica Sinica 2021年第11期40卷 147-161页

作者： Ling Chen Limei Tang Jichao Yang Xiaohu Li Wei Wang Fengyou Chu Jie Zhang Key Laboratory of Submarine Geosciences Ministry of Natural Resources/Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China National Deep Sea Center Ministry of Natural ResourcesQingdao 266237China State Key Laboratory of Continental Dynamics Department of GeologyNorthwest UniversityXi’an 710069China

We present major and trace element data of lava recovered from the northern Yap Trench in the western Pacific and discuss their petrogenesis and tectonic implications within the framework of interactions between the Caroline ridge and Yap *** were collected from both landward and seaward trench slopes and exhibited geochemical characteristics similar to backarc basin basalt(BABB)and mid-ocean ridge basalt(MORB),including high Fe content,tholeiitic affinity,high TiO_(2) value at a given FeO_(T)/MgO ratio,Ti/V ratio between 20 and50,low Ba/Nb ratio and Th/Nb ratio,and trace element patterns commonly displayed by BABB and MORB,which are distinct from arc *** rocks seem to have been generated during mantle upwelling and decompression melting at a spreading ***,compared with typical forearc lava produced by seafloor spreading in the Mariana forearc region,such as the early Eocene forearc basalts and late Neogene forearc lava in the southernmost Mariana Trench,the Yap Trench lava is derived from a more fertile mantle and feature a more minor subduction component;thus,they cannot be the products of forearc mantle decompression *** suggest that the landward slope lava represents backarc basin crust that was overthrust onto the forearc lithosphere during the collision of the Caroline ridge with the Yap Trench(20–25 Ma),which played a key role in the evolution of the Yap subduction ***,the seaward slope lava represents the subduction plate crust that accreted onto the deep trench during the *** collision event resulted in the cessation of Yap Arc magmatism;thus,the Yap Trench volcanic rocks(subduction component than in the mature Mariana Arc lava.

关键词： subduction zone Yap Trench forearc magmatism subduction component ridge subduction

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Early Paleozoic Granite in the Talate Mining District, Chinese Altay, and its Geological Significance for the Altay Orogenic Belt

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Acta Geologica Sinica(English Edition) 2019年第6期93卷 1721-1737页

作者： LIU Feng CHAI Fengmei HAN Dan MNR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesChinese Academy of Geological SciencesBeijing 10037China College of Geology&Prospecting Engineering Program Xinjiang UniversityUrumqi 830046China

Zircon dating,geochemical and Nd-Sr isotopic analyses have been determined for samples from two granitic intrusions in the Talate mining district,Chinese *** data suggest that these intrusions were emplaced from 462.5 Ma to 457.8 *** rocks have strong affinity to peralumious S-type granite and are characterized by prominent negative Eu anomalies(δEu=0.20–0.35),strong depletion in Ba,Sr,P,Ti,Nb,Ta and positive anomalies in Rb,Th,U,K,La,Nd,Zr,***-Sr isotopic compositions of the whole rock show negativeεNd(t)values(-1.21 to-0.08)and Mesoproterozoic Nd model ages(T2 DM=1.20–1.30 Ga).Their precursor magmas were likely derived from the partial dehydration melting of Mesoproterozoic mica-rich pelitic sources and mixed with minor mantle-derived components,under relatively low P(≤1 kbar)and high T(746–796℃)conditions.A ridge subduction model may account for the early Paleozoic geodynamic process with mantle-derived magmas caused by Ordovician ridge subduction and the opening of a slab window underplated and/or intraplated in the middle–upper crust,which triggered extensive partial melting of the shallow crust to generate diverse igneous rocks,and provided the heat for the crustal melting and juvenile materials for crustal growth.

关键词： geochronology geochemistry S-type granite ridge subduction Chinese Altay Xinjiang province

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Geochemical and Zircon Hf-O Isotopic Constraints on the Origin of Wulian A-Type Granite in Shandong Peninsula,Eastern China

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Journal of Earth Science 2022年第3期33卷 609-622页

作者： Shuai Yuan He Li Lipeng Zhang Congying Li Haiyang Liu Ying-Yu Xue Weidong Sun Center of Deep Sea Research Institute of OceanologyCenter for Ocean Mega-ScienceChinese Academy of SciencesQingdao 266071China Laboratory for Marine Mineral Resources Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China School of Marine Sciences University of Chinese Academy of SciencesBeijing 100049China

Early Cretaceous A-type granitic plutons are widely distributed in Shandong Peninsula,which are of great significance to understanding the regional tectonic *** we report geochemical characteristics,geochronological results,and zircon Hf-O isotope compositions of Wulian granites to reveal its origin and geological *** granites share most characteristics of the A_(2)-type *** U-Pb LA-ICPMS analysis for Wulian A-type granites yields average age of 116.6±2.1 *** O isotope values range from 4.20‰to 5.57‰,and these values are marginally identical to or slightly lower than those of mantle zircon(5.3‰±0.3‰).Zirconε_(Hf)(t)values(-26.1--23.5)indicate an enriched *** zircon Hf-O isotope compositions indicate that the source region of Wulian granites involves the components of ancient oceanic *** from Wulian granites have the lower chlorine(0.06 wt.%-0.15 wt.%)and higher fluorine contents(2.11 wt.%-2.48 wt.%)compared with Haiyang pluton,together with their high(La/Gd)_(N),(La/Yd)_(N) and low(Gd/Yb)_(N) ratios and high oxygen state magma reflected from zircon,signifying that slab derived component was added into the overlying mantle region through fluid/*** geochemical characteristics of Wulian granites could be explained by the ridge(between the Izanagi and Pacific plates)subduction model,which began to influence the tectonic evolution of the Xuhuai region and Shandong Peninsula since~130±5 *** following slab window between two plates plausibly explains regional extension,resulting in hot magma upwelling and the formation of the A-type granite *** the Lower Yangtze River belt and Shandong Peninsula A-type granite proves the northward movement of the ridge between the Pacific Plate and Izanagi Plate.

关键词： A-type granite Shandong Peninsula ridge subduction zircon Hf-O isotope magma

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