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Lithospheric dripping in a soft collision zone:Insights from late Paleozoic magmatism suites of the eastern central asian orogenic belt

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Geoscience Frontiers 2023年第1期14卷 101-117页

作者： Zheng Ji Wen-Chun Ge M.Santosh Chuan-Biao Wan Yan-Long Zhang Jun-Hui Bi Hao Yang Yu Dong Yan Jing College of Geo-exploration Science and Technology Jilin UniversityChangchun 130026China College of Earth Sciences Jilin UniversityChangchun 130061China School of Earth Science and Resources China University of GeosciencesBeijingBeijing 100083China Department of Earth Sciences University of AdelaideAdelaideSouth Australia 5005Australia Exploration and Development Research Institute Daqing Oilfield Limited CompanyDaqing 163712China Tianjin Center China Geological SurveyTianjin 300170China

The closure of Paleo-asian Ocean is considered to have occurred along the Solonker Suture in the southernmost segment of the central asian orogenic belt(CAOB),the largest Phanerozoic accretionary orogen on the globe.The suture branches to the east to form the northern Hegenshan-Heihe Suture and the southern Solonker-Changchun Suture.The Hegenshan-Heihe Suture is an ideal natural laboratory for studying the post-collisional geodynamic processes operating in a soft collision zone driven by divergent double-sided subduction.Here we report results from an integrated study of the petrology,geochronology,geochemistry,and Sr-Nd-Hf isotopic compositions of the Early Carboniferous-Early Permian mag-matic suite in the Hailar Basin of the Xing'an-Erguna Block.The Early Carboniferous igneous rocks are represented by 356-349 Ma andesitic tuffs,exhibiting typical subduction-related features,such as enrichment in large-ion lithophile elements and depletion in high-field-strength elements.These features,together with the relatively depleted Sr-Nd-Hf isotopic compositions,constant Nb/Y values,but highly variable Rb/Y and Ba values indicate that these rocks were generated by partial melting of a depleted mantle wedge metasomatized by slab-derived fluids.The Late Carboniferous-Early Permian magmatic suite(317-295 Ma)is characterized by high Sr contents(313-1080 ppm)and low Y contents(5-13 ppm),and these can be subdivided into calc-alkaline adakitic rocks and high-K calc-alkaline adakitic rocks.The calc-alkaline adakitic rocks have higher values of Sr/Y,(Sm/Yb)_(source normalized),and Mg#,and lower values of Y,_(Ybsource normalized),and K_(2)O/Na_(2)O than the high-K calc-alkaline adakitic rocks,which suggests that the former was generated by partial melting of foundered lower continental crust and the latter by partial melting of normal lower continental crust.Based on our new data,in conjunction with those in previous studies,we conclude that the tectonic evolution of the Hegenshan-Heihe Suture involved Early Carboniferous double-

关键词： Soft collision Lithospheric dripping Double-sided subduction central asian orogenic belt Late Paleozoic

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Petrogenesis of Early Permian Intrusive Rocks from Southeastern Inner Mongolia, China: Constraints on the Tectonic Framework of the Southeastern central asian orogenic belt

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Acta Geologica Sinica(English Edition) 2022年第5期96卷 1566-1586页

作者： QIAN Cheng LU Lu SHI Lu DU Jiyu WANG Yan YANG Xiaoping ZHANG Yujin Shenyang Center China Geological SurveyShenyang 110034China College of Paleontology Shenyang Normal UniversityShenyang 110034China Key Laboratory of Evolution of Past Life in Northeast Asia Ministry of Land and ResourcesShenyang 110034China

The late Paleozoic tectonic framework of the southeastern central asian orogenic belt is key to restricting the accretion orogeny between the Siberia Craton and the North China Craton. To clarify the framework, petrogenesis of early Permian intrusive rocks from southeastern Inner Mongolia was studied. Zircon U-Pb dating for bojite and syenogranite from Ar-Horqin indicate that they were emplaced at 288–285 Ma. Geochemical data reveal that the bojite is highly magnesian and low-K to middle-K calc-alkaline, with E-MORB-type REE and IAB-like trace element patterns. The syenogranite is a middle-K calc-alkaline fractionated A-type granite and shows oceanic-arc-like trace element patterns, with depleted Sr-Nd-Hf isotopes,(~(87)Sr/~(86)Sr)I = 0.7032–0.7042, ε_(Nd)(t) = +4.0 to +6.6 and zircon ε_(Hf)(t) = +11.14 to +14.99. This suggests that the bojite was derived from lithospheric mantle metasomatized by subducted slab melt, while the syenogranite originated from very juvenile arc-related lower crust. Usng data from coeval magmatic rocks from Linxi-Ar-Horqin, the Ar-Horqin intra-oceanic arc was reconstructed, i.e., initial transition in 290–280 Ma and mature after 278 Ma. Combined with regional geological and geophysical materials in southeastern Inner Mongolia, an early Permian tectonic framework as ‘one narrow ocean basin of the PAO', ‘two continental marginal arcs on its northern and southern' and ‘one intra-oceanic arc in its southern' is proposed.

关键词： tectonic framework early Permian intra-oceanic arc southeastern Inner Mongolia central asian orogenic belt

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Crustal Contamination of the Mantle-Derived Liuyuan Basalts:Implications for the Permian Evolution of the Southern central asian orogenic belt

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Journal of Earth Science 2022年第5期33卷 1081-1094页

作者： Yuanyang Yu Keqing Zong Yu Yuan Reiner Klemd Xin-Shui Wang Jingliang Guo Rong Xu Zhaochu Hu Yongsheng Liu State Key Laboratory of Geological Processes and Mineral Resources School of Earth SciencesChina University of GeosciencesWuhan 430074China GeoZentrum Nordbayern Universität Erlangen-NürnbergSchlossgarten 5aErlangenD-91054Germany State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang550081China

The Permian basalts in the central asian orogenic belt(CAOB)are crucial for constraining the closure of the Paleo-asian Ocean.However,the origin of these basalts is still under discussion.Here,we present comprehensive bulk-rock geochemical,Sr-Nd-Pb-Hf isotopic,and zircon U-Pb-Lu-Hf isotopic data of the Liuyuan basalts and coexisting gabbros,which are located in the Beishan Orogen in the southern CAOB,to constrain their emplacement setting and tectonic implications.Our new gabbro ages of ca.288–294 Ma are interpreted to represent the formation time of the Liuyuan basaltic belt.The Liuyuan basalts show MORB-like rare earth element(REE)patterns and bulk-rockε_(Hf)(t)andε_(Nd)(t)values of 11.0–15.4 and 4.6–9.2,respectively,suggesting an origination mainly from a depleted mantle source.However,positive Pb anomalies,Nb-Ta depletions,and high Th/Yb ratios as well as evolved Sr-Nd-Pb-Hf isotopic compositions of some samples indicate variable continental crustal contribution.According to the covariation of Pb anomalies(Pb^(*)=2×Pb_(N)/(Ce_(N)+Pr_(N)))with Sr-Nd-Pb-Hf isotopic compositions,we speculate that parent magma of the Liuyuan basalt was contaminated by continental crustal materials during the eruption rather than having been generated from an enriched mantle source.As revealed by mixing modelling,the Liuyuan basaltic magmas would require a minor(belt is believed to have been generated in a continental extensional environment instead of an oceanic setting and does not constitute a Permian ophiolitic suture zone as previously suggested,since the Paleo-asian Ocean was already closed in the southern Beishan Orogen in the Early Permian.

关键词： crustal contamination Liuyuan basaltic belt central asian orogenic belt Beishan Orogen Pb anomaly tectonics

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Yanshanian–Himalayan geodynamic transformation of the northwestern Junggar Basin, southwestern central asian orogenic belt (CAOB), and its significance for petroleum accumulation

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Geoscience Frontiers 2023年第4期14卷 220-229页

作者： Dongming Zhi Jingkun Zhang Tao Wu Anbin Wu Yong Tang Yin Liu Jian Cao PetroChina Tuha Oilfield Company Hami 839000China School of Earth Sciences and Engineering Nanjing UniversityNanjing 210023China State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and PalaeontologyChinese Academy of SciencesNanjing 210008China PetroChina Xinjiang Oilfield Company Karamay 843000China School of Geosciences China University of Petroleum(East China)Qingdao 266580China

The northwestern Junggar Basin in the southwestern central asian orogenic belt is a typical petroliferous basin.The widely distributed reservoirs in Jurassic–Cretaceous strata indicate that the region records Yanshanian–Himalayan tectonic activity,which affected the accumulation and distribution of petroleum.The mechanism of this effect,however,has not been fully explored.To fill the knowledge gap,we studied the structural geology and geochemistry of the well-exposed Wuerhe bitumen deposit.Our results indi-cate that deformation and hydrocarbon accumulation in the northwestern Junggar Basin during the Yanshanian–Himalayan geodynamic transformation involved two main stages.During the Yanshanian orogeny,a high-angle extensional fault system formed in Jurassic–Cretaceous strata at intermediate to shallow depths owing to dextral shear deformation in the orogenic belt.This fault system connected at depth with the Permian–Triassic oil–gas system,resulting in oil ascending to form fault-controlled reservoirs(e.g.,a veined bitumen deposit).During the Himalayan orogeny,this fault system was deacti-vated owing to sinistral shear caused by far-field stress related to uplift of the Tibetan Plateau.This and the reservoir densification caused by cementation formed favorable hydrocarbon preservation and accu-mulation conditions.Therefore,the secondary oil reservoirs that formed during the Yanshanian–Himalayan tectonic transformation and the primary oil reservoirs that formed during Hercynian–Indosinian orogenies form a total and complex petroleum system comprising conventional and uncon-ventional petroleum reservoirs.This might be a common feature of oil–gas accumulation in the central asian orogenic belt and highlights the potential for petroleum exploration at intermediate–shal-low depths.

关键词： Geodynamic transformation Tectonic far-field stress Yanshanian-Himalayan central asian orogenic belt Total petroleum system

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Constructing the latest Neoproterozoic to Early Paleozoic multiple crust-mantle interactions in western Bainaimiao arc terrane,southeastern central asian orogenic belt

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Geoscience Frontiers 2020年第5期11卷 1727-1742页

作者： Min Liu Shaocong Lai Da Zhang Renzhi Zhu Jiangfeng Qin Guangqiang Xiong Haoran Wang State Key Laboratory of Continental Dynamics Department of GeologyNorthwest UniversityXi’an 710069China School of Earth Sciences and Resources China University of GeosciencesBeijing 100083China Geophysical and Geochemical Exploration Party Jiangxi Bureau of Geology and Mineral ResourcesNanchang 330201China

Identifying the crust-mantle interactions in association with the evolution of the Precambrian microcontinents provides critical constraints on the accretionary evolution in the central asian orogenic belt(CAOB).The Bainaimiao arc terrane(BAT)is one of the most important Precambrian microcontinents in southeastern CAOB,however,few studies have paid attention to the types and the evolving processes of the crust-mantle interactions that occurred before its final accretion onto the northern North China Craton.This study presents an integrated study of geochronology,zircon Hf isotope and whole-rock geochemistry on the latest Neoproterozoic diabases and the Early Paleozoic arc intrusions in the western BAT.The latest Neoproterozoic(ca.546 Ma)diabases display low SiO2(46.52-49.24 wt.%)with high MgO(8.23-14.41 wt.%),Cr(66-542 ppm)and Ni(50-129 ppm),consisting with mantle origin.Their highly negative zirconεHf(t)(-12.0 to-24.7)and high Fe/Mn ratios(62.1-81.7)further indicate a significantly enriched mantle source.Considering that the BAT maybe initially separated from the Tarim Craton with a thickened crustal root,we propose that these diabases were generated through partial melting of an enriched lithospheric mantle source that had been hybridized by lower-crustal eclogites during foundering of the BAT lower crust.The Early Paleozoic(ca.475-417 Ma)arc intrusions in western BAT can be divided into PeriodsⅠandⅡat approximately 450 Ma.The PeriodⅠ(>450 Ma)intrusions contain abundant mafic minerals like hornblende and pyroxene,and show positive zirconεHf(t)(+1.5 to+10.9).They are predominantly medium-K calc-alkaline with broad correlations of SiO2 versus various major and trace elements,which correlate well with the experimental melts produced by the fractional crystallization of primitive hydrous arc magmas at 7 kbar.We assume they were formed through mid-crustal differentiation of the mantle wedge-derived hydrous basaltic melts.By contrast,the PeriodⅡ(≤450 Ma)intrusions are characterized by variable zircon eHf(t)(-15.0 to+

关键词： Zircon Hf isotope Microcontinent Crust-mantle interaction Arc intrusions central asian orogenic belt

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Early Paleozoic geodynamic evolution of the Eastern central asian orogenic belt: Insights from granitoids in the Xing’an and Songnen blocks

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Geoscience Frontiers 2020年第6期11卷 1975-1992页

作者： Xin-Lu Hu Shu-Zhen Yao Cheng-Yin Tan Guo-Ping Zeng Zhen-Ju Ding Mou-Chun He Faculty of Earth Resources China University of GeosciencesWuhan430074China National Demonstration Center for Experimental Mineral Exploration Education China University of GeosciencesWuhan430074China Heilongjiang Mining Group Limited Liability Company Harbin150036China Wuhan Center China Geological SurveyWuhan430205China

The early Paleozoic tectonic framework and evolutionary history of the eastern central asian orogenic belt(CAOB)is poorly understood.Here we present zircon U-Pb geochronology,whole rock geochemistry,and Sr-NdHf isotope data of the early Paleozoic granitoids in eastern CAOB to investigate the petrogenesis and geodynamic implications.The early Paleozoic granitoids from the Songnen Block yield zircon U-Pb ages of 523-490 Ma,negative εNd(t)values of-6.7 to-0.8,and values of-8.6 to 7.1,indicating they were generated by partial melting of ancient crustal materials with various degrees of mantle contribution.They generally show affinities to A-type granites,implying their generation from an extensional environment after the collision between the Songnen and Jiamusi blocks.In comparison,the early Paleozoic granitoids from the Xing’an Block have zircon U-Pb ages of 480-465 Ma,εNd(t)values of-5.4 to 5.4,andεHf(t)values of-2.2 to 12.9,indicating a dominated juvenile crustal source with some input of ancient crustal components.They belong to I-type granites and were likely related to subduction of the Paleo-asian Ocean.The statistics of TDM2 Hf model ages of the granitoids indicate that the Erguna and Jiamusi blocks contain a significant proportion of Mesoproterozoic crystalline basement,while the Xing’an Block is dominated by a Neoproterozoic basement.Based on these observations,the early Paleozoic evolutionary history of eastern GAOB can be divided into four stages:(1)before 540 Ma,the Erguna,Xing’an,Songnen,and Jiamusi blocks were discrete microcontinents separated by different branches of the Paleo-asian Ocean;(2)540-523 Ma,the Jiamusi Block collided with the Songnen Block along the Mudanjiang suture;(3)ca.500 Ma,the Erguna Block accreted onto the Xing’an Block along the Xinlin-Xiguitu suture;(4)ca.480 Ma,the Paleo-asian Ocean started a double-side subduction beneath the united Erguna-Xing’an and Songnen-Jiamusi blocks.

关键词： Early Paleozoic U–Pb geochronology Sr-Nd-Hf isotopes NE China central asian orogenic belt

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Detrital zircon constraints on late Paleozoic tectonism of the Bogda region(NW China)in the southern central asian orogenic belt

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Geoscience Frontiers 2020年第5期11卷 1533-1548页

作者： Qian Wang Guochun Zhao Yigui Han Jinlong Yao State Key Laboratory of Continental Dynamics Department of GeologyNorthwest University229 Northern Taibai RoadXi’an 710069China Department of Earth Sciences The University of Hong KongPokfulam RoadHong KongChina

The Chinese North Tianshan(CNTS)in the southern part of the central asian orogenic belt(CAOB)has undergone multistage accretion-collision processes during Paleozoic time,which remain controversial.This study addresses this issue by tracing the provenance of Late Paleozoic sedimentary successions from the Bogda Mountain in the eastern CNTS through U-Pb dating and Lu-Hf isotopic analyses of detrital zircons.New detrital zircon U-Pb ages(N=519)from seven samples range from 261±4 Ma to 2827±32 Ma.The most prominent age peak is at 313 Ma and subordinate ages vary from 441 Ma to 601 Ma,with some Precambrian detrital zircon ages(~7%)lasting from 694 Ma to 1024 Ma.The youngest age components in each sample yielded weighted mean ages ranging from 272±9 Ma to 288±5 Ma,representing the maximum depositional ages.These and literature data indicate that some previously-assumed"Carboniferous"strata in the Bogda area were deposited in the Early Permian,including the Qijiaojing,Julideneng,Shaleisaierke,Yangbulake,Shamaershayi,Liushugou,Qijiagou,and Aoertu formations.The low maturity of the sandstones,zircon morphology and provenance analyses indicate a proximal sedimentation probably sourced from the East Junggar Arc and the Harlik-Dananhu Arc in the CNTS.The minor Precambrian detrital zircons are interpreted as recycled materials from the older strata in the Harlik-Dananhu Arc.Zircon EHf(t)values have increased since^408 Ma,probably reflecting a tectonic transition from regional compression to extension.This event might correspond to the opening of the Bogda intraarc/back arc rift basin,possibly resulting from a slab rollback during the northward subduction of the North Tianshan Ocean.A decrease of zirconεHf(t)values at^300 Ma was likely caused by the cessation of oceanic subduction and subsequent collision,which implies that the North Tianshan Ocean closed at the end of the Late Carboniferous.

关键词： North Tianshan Detrital zircon Sedimentary provenance Late Paleozoic central asian orogenic belt

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Geochemistry,geochronology and Hf isotope of granitoids in the northern Alxa region:Implications for the Late Paleozoic tectonic evolution of the central asian orogenic belt

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Geoscience Frontiers 2020年第5期11卷 1711-1725页

作者： Xiaochen Zhao Chiyang Liu Jianqiang Wang Shaohua Zhang Yuzhao Guan College of Geology and Environment Xi’an University of Science and TechnologyXi’an 710054ShaanxiChina State Key Laboratory of Continental Dynamics Department of GeologyNorthwest UniversityXi’an 710069ShaanxiChina

The tectonic setting of the northern Alxa region during the Late Paleozoic is highly controversial.The key to resolve this controversy is to recognize the Late Paleozoic magmatic processes in the northern Alxa.In this paper,we present new zircon U-Pb ages,Hf-isotopic compositions and whole-rock geochemical data of four granitoids along the Zhusileng-Hangwula Tectonic belt in the northern Alxa region that could provide critical information about the tectonic evolution of this region.The zircon U-Pb data could be grouped as two phases:Late Devonian granite and diorite(ca.373-360 Ma),and Late Carboniferous granodiorite(ca.318 Ma).The Late Devonian granites and diorites are metaluminous to slightly peraluminous,with A/CNK and A/NK ratios of 0.90-1.11 and0.95-2.19,respectively.The Late Devonian diorites are characterized by high MgO,Cr and Ni contents and MgO#values,together with variableεHf(t)values from-1.0 to+1.3 and old TDM2 ages varied from 1283 Ma to 1426 Ma,indicating the primary magma was potentially derived from magma mixing of depleted mantle with Mesoproterozoic continental crust.Even though the Late Devonian granites yielded most positive and minor negative eHf(t)values between-1.1 to+5.7(three grains are negative)with two-stage model ages(TDM2)of 1003-1438 Ma,they display low MgO,Cr and Ni contents and MgO#values,suggesting that they were mainly derived from juvenile crustal materials,mixed with a small amount of ancient crust.The Late Carboniferous granitoids are metaluminous and medium-K calc-alkaline series,with A/CNK and A/NK ratios ranging from 0.88 to 0.95 and1.75 to 1.90,respectively.These rocks were potentially derived from juvenile crustal materials mixed with depleted mantle,as evidenced by their highεHf(t)values(+11.6 to+14.1)and young TDM2 ages(427 Ma to 586 Ma),as well as high Mg#values,and MgO,Ni and Cr contents.Our data,along with available sedimentary evidence and previous researches,indicate that the Late Devonian and Late Carboniferous rocks are arc-related granitoids under the subductio

关键词： Geochemistry U–Pb geochronology Hf isotopic composition Granitoids Northern Alxa region central asian orogenic belt

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Early Neoproterozoic Granite-Gneisses of the Junggar Alataw(Southeastern Kazakhstan):Age,Petrogenesis and Tectonic Implications

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Acta Geologica Sinica(English Edition) 2024年第1期98卷 67-82页

作者： Nadezhda KANYGINA Andrey TRETYAKOV Dmitriy ALEXEIEV Kirill DEGTYAREV Anfisa SKOBLENKO Natalia SOLOSHENKO Boris ERMOLAEV Geological Institute Russian Academy of SciencesMoscow 119017Russia A.N.Zavaritsky Institute of Geology and Geochemistry Ural Branch of the Russian Academy of SciencesYekaterinburg 620016Russia

The combined petrographic,petrological,geochemical and geochronological study of the Neoproterozoic gneisses of the Sarychabyn and Baskan complexes of the Junggar Alataw of South Kazakhstan elucidate the Precambrian tectonic evolution of the Aktau–Yili terrane.It is one of the largest Precambrian crustal blocks in the western central asian orogenic belt.The U-Pb single-grain zircon ages indicate that granite-gneisses formed from the same source and crystallised in the early Neoproterozoic ca.930–920 Ma.The chemical composition of gneisses corresponds to A2-type granites.The whole-rock Nd isotopic characteristics(εNd(t)=−4.9 to−1.0 and TNd(DM-2st)=1.9 to 1.7 Ga)indicate the involvement of Paleoproterozoic crustal rocks in magma generation.Early Neoproterozoic ca.930–920 Ma A-type granitoids in the Aktau–Yili terrane of South and central Kazakhstan might reflect within-plate magmatism adjacent to the collisional belt or a local extension setting in back-arc areas of the continental arc.

关键词： granitoid magmatism geochemistry geochronology Sm-Nd isotope systematics Neoproterozoic Junggar Alataw Kazakhstan central asian orogenic belt

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Geochronology and Geochemistry of the Xingxingxia Triassic A-type Granites in central Tianshan,NW China:Petrogenesis and Tectonic Implications

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Acta Geologica Sinica(English Edition) 2024年第2期98卷 337-351页

作者： HUANG Zengbao LI Xiyao ZHAO Hao LU Qing Geological Survey of Gansu Province Lanzhou 735000China Key Laboratory of Submarine Geosciences and Prospecting Techniques MOE and College of Marine GeosciencesOcean University of ChinaQingdaoShandong 266100China Research Institute of Petroleum Exploration and Development Shengli OilfieldSINOPECDongyingShandong 257000China

The Triassic granitoids in central Tianshan play a key role in determining the petrogenesis and tectonic evolution on the southern margin of the central asian orogenic belt.In this study,we present SHRIMP zircon U-Pb ages,Hf isotopic and geochemical data on the Xingxingxia biotite granite,amazonite granite and granitic pegmatite in central Tianshan,NW China.Zircon U-Pb dating yielded formation ages of 242 Ma for the biotite granite and 240 Ma for the amazonite granite.These granitoid rocks have high K_(2)O with low MgO and CaO contents.They are enriched in Nb,Ta,Hf and Y,while being depleted in Ba and Sr,showing flat HREE patterns and negative Eu anomalies.They have typical A-type granite geochemical signatures with high Ga/A_(1)(8–13)and TFeO/(TFeO+MgO)ratios,showing an A_(2) affinity for biotite granite and an A_(1) affinity for amazonite granite and granitic pegmatite.Zircon ε_(Hf)(t)values of the granitoids are 0.45–2.66,with Hf model ages of 0.99–1.17 Ga.This suggests that these A-type granites originated from partial melting of the lower crust.We propose that Xingxingxia Triassic A-type granites formed under lithospheric extension from post-orogenic to anorogenic intraplate settings and NE-trending regional strike-slip fault-controlled magma emplacement in the upper crust.

关键词： Triassic A-type granite Xingxingxia central Tianshan central asian orogenic belt

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