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古亚洲洋构造域中西段新元古代晚期至晚泥盆世的构造运动

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地质学报 2025年第1期99卷 58-77页

作者：孟勇张欣陈奋宁李佐臣冯益民祁尧刚郑若蕾中国地质调查局西宁自然资源综合调查中心青海西宁810021 中国地质大学(北京地球科学与资源学院) 北京100083 中国地质调查局西安地质调查中心陕西西安710119 长安大学地球科学与资源学院陕西西安710054

古亚洲洋构造域是由东欧克拉通和西伯利亚克拉通南侧的沟弧盆系统、主洋盆系统和卡拉库姆-塔里木-华北克拉通北侧的大陆边缘系统组成的复合型造山带,其动力学体系波及范围涉及萨彦-额尔古纳造山系、乌拉尔-天山-兴蒙造山系,昆仑-祁连-... 详细信息

古亚洲洋构造域是由东欧克拉通和西伯利亚克拉通南侧的沟弧盆系统、主洋盆系统和卡拉库姆-塔里木-华北克拉通北侧的大陆边缘系统组成的复合型造山带,其动力学体系波及范围涉及萨彦-额尔古纳造山系、乌拉尔-天山-兴蒙造山系,昆仑-祁连-秦岭造山系等,这一地域保存了新元古代晚期到泥盆纪造山过程的丰富信息,是研究古亚洲洋演化的重要窗口。本文以古亚洲洋动力学体系波及范围的中西段为研究对象,在总结前人研究成果的基础上,将新元古代晚期至晚泥盆世的构造运动划分为贝加尔造山运动、萨拉伊尔(兴凯)造山运动、哈萨克斯坦造山运动、加里东造山运动和天山造山运动:①贝加尔造山运动使图瓦地块和阿巴坎地块拼接到西伯利亚克拉通南缘,表现为增生造山;②萨拉伊尔造山运动使阿尔泰地块和南蒙古地块先后拼贴在西伯利亚克拉通南缘,形成萨彦-额尔古纳增生造山系,也属于增生造山运动;③出现在中奥陶世—晚奥陶世的哈萨克斯坦造山运动使科克切塔夫地块、斋桑地块、克孜勒库姆地块、巴尔喀什-伊犁地块、伊塞克地块、中天山地块及准噶尔地块之间的洋盆封闭,形成哈萨克斯坦联合陆块;④发生在志留纪末(东西昆仑则持续到中泥盆世末期的加里东造山运动使阿中地块、中祁连地块、南祁连地块、柴达木地块、西秦岭联合地块、秦岭地块和上扬子陆块拼贴在中轴大陆块区南缘,造成中轴大陆块区南缘大陆增生;⑤发生在中泥盆世末—晚泥盆世的天山造山运动使中轴大陆块区中西段与扩大后的西伯利亚陆块拼接在一起。本研究加深了对古亚洲洋复杂构造历史的理解及对区域地质的影响。

关键词：古亚洲洋构造域贝加尔造山运动萨拉伊尔造山运动兴凯造山运动哈萨克斯坦造山运动加里东造山运动天山造山运动

Corrosion behaviors of a new titanium alloy TZNT for surgical implant application in Ringer’s solution

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Rare Metals 2010年第1期29卷 37-44页

作者： li Jun ZHOU lian li zuochen School of Materials Engineering Shanghai University of Engineering Science Shanghai 201620 China Northwest Institute for Nonferrous Metal Research Xl an 710016 China

A new near α-titanium alloy Ti12.5Zr2.5Nb2.5Ta （TZNT） for surgical implants was designed. The potentiodynamic technique was performed to investigate the corrosion behaviors of TZNT in Ringer＇s solution, and Ti6A14V, Ti6Al7Nb, and TA2 were taken as comparison. The structure of the passive film was analyzed using an X-ray photoelectron spectrometer （XPS）. The results indicate that TZNT possesses better corrosion resistance, when compared with Ti6A14V, Ti6A17Nb, and TA2. The passive film formed on the TZNT surface is composed of oxides, such as TiO2, ZrO2, Nb2O5, and Ta2O5. The elements Zr and Ta are rich, whereas Ti and Nb are poor in the passive film. The addition of Zr, Nb, and Ta with relatively low electrochemical reaction potentials can reduce the anode activity and improve passive properties. Other than that, oxides such as ZrO2, Nb2O5, and Ta2O5 with the nobler equilibrium constants make the passive film more stable.

关键词： titanium alloy surgical implant electrochemistry passive film corrosion resistance

Paleo-Tethyan Oceanic Crust Subduction in the Eastern Section of the East Kunlun Orogenic Belt:Geochronology and Petrogenesis of the Qushi'ang Granodiorite

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Acta Geologica Sinica(English Edition) 2017年第2期91卷 565-580页

作者： CHEN Guochao PEI Xianzhi li Ruibao li zuochen liU Chengjun CHEN Youxin PEI Lei WANG Meng li Xiaobing Key Laboratory of Western China's Mineral Resources and Geological Engineering Ministry of EducationKey Laboratory for the study of Focused Magmatism and Giant Ore DepositsMLRFaculty of Earth Science and Resources Chang'an University Nanyang Institutte of Technolog School of Civil Engineeringy School of Earth Science and Resource China University of Geosciences Shanxi Normal University College of Geographical Sciences

The Qushi’ang granodiorite（QSG） is located at the central east of the ophiolitic melange belt in the East Kunlun Orogenic Belt（EKOB） in the northern margin of the Qinghai-Tibetan Plateau. LA-MC-ICP-MS zircon U–Pb dating suggests that the granodiorite and mafic microgranular enclaves（MMEs） crystallized 246.61±0.62 and 245.45±0.9 Ma ago, respectively. Granodiorite, porphyritic diorite, and MMEs are metaluminous and medium-K calk-alkaline series, with island-arc magma features, such as liLE enrichment and HFSE depletion. The porphyritic diorite has high Cr（13.50 ppm to 59.01 ppm）, Ni（228.53 ppm to 261.29 ppm）, and Mg~#（46–54）. Granodiorite and porphyritic diorite have similar mineral compositions and evolved major and trace elements contents, particularly Cr and Ni, both of which are significantly higher than that in granites of the same period. The crystallization age of MMEs is close to that of granodiorite, and their major and trace elements contents are in-between porphyritic diorite and granodiorite. The results suggest that the original mafic magma, which was the product of mantle melting by subduction process, intruded into the lower crust（Kuhai Rock Group）, resulting in the formation of granodiorite. Countinous intrusion of mafic magma into the unconsolidated granodiorite formed MMEs and porphyritic diorite. The granodiorite reformed by late-stage strike-slip faulting tectonic event indicates that the strike-slip fault of Middle Kunlun and the collision of the Bayanhar block with East Kunlun were later than 246 Ma. Therefore, the formation of the QSG not only indicates the critical period of evolution of East Kunlun but also represents the tectonic transition from oceanic crust subduction to slab breaking.

关键词： East Kunlun Orogenic Belt(EKOB) Qushi’ang granodiorite(QSG) mafic microgranular enclaves(MME) Early Triassic Tibet Proto-Tethy

The LA-ICP-MS zircons U-Pb ages and geochemistry of the Baihua basic igneous complexes in Tianshui area of West Qinling

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Science China Earth Sciences 2007年第z2期50卷 264-276页

作者： PEI XianZhi DING SaPing ZHANG GuoWei liU HuiBin li zuochen li GaoYang liU ZhanQing MENG Yong Key Laboratory of Western China's Mineral Resources and Geological Engineering Ministry of Education Faculty of Earth Science and Land Resources Chang'an University Xi'an 710054 China Key Laboratory of Western China's Mineral Resources and Geological Engineering Ministry of Education Faculty of Earth Science and Land Resources Chang'an University Xi'an 710054 China State Key Laboratory of Continental Dynamics Department of Geology Northwest University Xi'an 710069 China Key Laboratory of Western China's Mineral Resources and Geological Engineering Ministry of Education Faculty of Earth Science and Land Resources Chang'an University Xi'an 710054 China

Baihua meta-igneous complex consists mainly of pyroxenite-gabbro(diorite)-diorite-quartz diorite. They form a complete comagmatic evolutionary series. The geochemical characteristics of basic-interme- diate basic igneous rocks indicate that they belong to a tholeiite suite. The REE distribution pattern is nearly flat type and LREE is slightly enriched type, and their primitive mantle-normalized and MORB-normalized trace element spider diagrams are generally similar; the liL elements (liLE) Cs, Ba, Sr, Th and U are enriched, but Rb, K and the HFSEs Nb, P, Zr, Sm, Ti and Y are relatively depleted. All these show comagmatic evolution and origin characteristics. The tectonics environment discrimination of trace element reveals that these igneous complexes formed in an island-arc setting. The LA-ICP-MS single-zircons U-Pb age of Baihua basic igneous complex is 434.6±1.5 Ma (MSWD = 1.3), which proves that the formation time of the island-arc type magmatite in the northern zone of West Qinling is Late Ordovician or Early Silurian, also reveals that the timing of subduction of paleo-ocean basin represented by the Guanzizhen ophiolite and resulting island-arc-type magmatic activities is probably Middle-Late Ordovician to Early Silurian.

关键词： basic igneous complex, island-arc setting, LA-ICP-MS, zircons U-Pb isotopic ages, Tianshui area, West Qinling

Discovery of Early Paleozoic Garnet Amphibolite in the Wenquan Complex,Northern Margin of the Yili Block,NW China

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Acta Geologica Sinica(English Edition) 2021年第2期95卷 696-698页

作者： CHEN Youxin CHENG Kaikai PEI Xianzhi WANG Meng ZHAO Shaowei li zuochen li Ruibao PEI Lei GAO feng Key Laboratory of Western China's Mineral Resources and Geological Engineering Ministry of EducationSchool of Earth Science and ResourcesChang'an UniversityXi'an 710054China Mechanical Engineering Institute Xi'an Shiyou UniversityXi'an 710065China

Objective High-pressure(HP)and ultrahigh-pressure(UHP)minerals tend to be preserved in mafic and ultramafic metamorphic rocks(*** and garnet amphibolite)rather than felsic ***,HP and UHP rocks are thought to be formed as a result of the tectonic burial or subduction of oceanic crust or thicked continental lithosphere to depths corresponding to the eclogite facies metamorphism,followed by fast uplift(Ernst et al.,2007).

关键词： uplift depths thick

U–Pb Zircon Geochronology and Geochemistry of the Neoproterozoic liujiaping Group Volcanics in the Northwest Margin of the Yangtze Block:Implications For the Breakup of the Rodinia Supercontinent

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Acta Geologica Sinica(English Edition) 2015年第4期89卷 1213-1225页

作者： li zuochen PEI Xianzhi li Ruibao PEI Lei liU Chengjun CHEN Youxin XU Tong YANG Jie WEI Bo Key Laboratory of Western China's Mineral Resources and Geological Engineering Ministry of EducationFaculty of Earth Science and ResourcesChang'an University Faculty of Earth Science and Mineral Resources China University of Geosciences

Investigation of the petrogenesis and the origin of zircons from the volcanic rocks of the liujiaping Group of the back-Longmenshan tectonic belt in the northwest margin of the Yangtze Block is conducted by analysis of U-Pb geochronology and geochemistry. Results show that selected zircons are characterized by internal oscillatory zonings and high Th/U ratios （0.43-1.18）, indicating an igneous origin. Geochronological results of LA-ICP-MS U-Pb dating of the liujiaping Group zircons yield an age of 809 - 11 Ma （MSWD = 2.2）, implying that the volcanic rocks were formed in the Late Neoproterozoic. Geochemical analysis shows that the rocks are calc-alkaline, supersaturated in AI, and metaluminous to weakly peraluminous. Rare-earth elements are present at high concentrations （96.04-265.48 ppm） and show a rightward incline and a moderately negative Eu anomaly, similar to that of continental rift rhyolite. Trace element geochemistry is characterized by evident negative anomalies of Nb, Ta, P, Th, Ti, inter alia, and strong negative anomalies of K, Rb, Sr, et al. We conclude that the liujiaping Group volcanic rocks resulted from typical continental crust source petrogenesis and were formed in a continental margin setting, which had no relation to subduction, and thus, were the products of partial melting of the lower crust due to crustal thickening caused by active continental margin subduetion and arc-continent collision orogeny in the northwestern Yangtze Block and were triggered by the breakup of the Rodinia supercontinent during the Neoproterozoic.

关键词： geochemistry zircon LA-ICP-MS U-Pb age late Precambrian tectonics Shaanxiprovince

Geochemical Features, Age, and Tectonic Significance of the Kekekete Mafic-ultramafic Rocks, East Kunlun Orogen, China

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Acta Geologica Sinica(English Edition) 2013年第5期87卷 1319-1333页

作者： li Ruibao PEI Xianzhi li zuochen SUN Yu FENG Jianyong PEI Lei CHEN Guochao liU Chengjun CHEN Youxin Key Laboratory of Western China’s Mineral Resources and Geological Engineering Ministry of Education School of Earth Science and Resources Chang’an University National Key Laboratory of Remote Sensing Information and Image Analysis Technology Beijing Research Institute of Uranium Geology Institute of Geology and Geophysics CAS School of Earth Science and Resources China University of Geosciences

The Kekekete mafic-ultramafic rocks are exposed in the Kekesha-Kekekete-Dawate area, which are in the eastern part of the East Kunlun Orogenic Belt. It outcrops as tectonic slices intruding tectonically in the Paleoproterozoic Baishahe Group and the Paleozoic Nachitai Group. The Kekekete mafic and ultramafic rocks is located near the central fault in East Kunlun and lithologically mainly consists of serpentinite, augite peridotite, and gabbro. The LA-ICP-MS zircon U-Pb age of the gabbro is 501±7 Ma, indicating that Kekekete mafic-ultramafic rocks formed in the Middle Cambrian. This rock assemblage is relatively poor in SiO2 and （Na20＋K20） but rich in MgO and SFeO. The chondrite-normalized REE patterns of the gabbro dip slightly to the right; the primitive mantle and MORB-normalized spidergrams of trace elements show enrichment of large-ion lithophile elements （Cs, Rb, Ba, etc.） and no differentiation of high field strength elements. The general dominance of E- MORB features and the geochemical characteristics of OIB suggest that the Kekekete mafic- ultramafic rocks formed in an initial oceanic basin with slightly enriched mantle being featured by varying degrees of mixing of N-MORB depleted mantle and a similar-OIB-type source. From a comprehensive study of the previous data, the author believes that the tectonic history of the East Kunlun region was controlled by a geodynamic system of rifting and extension in the late stages of the Neoproterozoic to early stages of the Early Paleozoic and this formed the paleo-oceanic basin or rift system now represented by the ophiolites along the central fault in East Kunlun, the Kekekete mafic- ultramafic rocks and Delisitan ophiolite.

关键词： ophiolite tectonic attribute Kekekete East Kunlun Orogeny

Detrital Zircon Geochronology of Early Triassic Strata in the West Qinling Orogen:Implications for the Tectonic Evolution of the Paleo-Tethyan Ocean

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Journal of Earth Science 2024年第4期35卷 1087-1106页

作者： zuochen li Xianzhi Pei liyong Wei Guobing liang Meng Wang Ruibao li Lei Pei Chengjun liu Youxin Chen Feng Gao Xi’an Key Laboratory for Mineralization and Efficient Utilization of Critical Metals School of Earth Science and ResourcesChang’an UniversityXi’an710054China Xi’an Mineral Resources Survey Center China Geological SurveyXi’an710100China School of Geology and Mining Engineering Xinjiang UniversityUrumqi830000China

The West Qinling Orogen(WQO)is located in the western part of the Qinling Orogen and in the transition zone of Qilian Orogen,Songpan-Garze Orogen and Yangtze Block,and also the key position of Triassic collision orogenic *** study of the Early Triassic strata in the WQO is contributed to analyze the closure process of the *** conducted LA-ICP-MS U-Pb dating studies on detrital zircons to determine the provenance,depositional age,and tectonic setting of the Early Triassic Longwuhe Formation in the lintan area of the *** results show that the majority of the detrital zircons in the Longwuhe Formation are mainly magmatic origin and have characteristic of crust source *** lowest limit of sedimentation of the Longwuhe Formation is constrained to the Early Triassic,with the youngest detrital zircon age of 253±3 *** ages can be divided into five age groups:3346–1636 Ma,with two peak ages of ca.2495 and ca.1885 Ma;1585–1010 Ma,with a peak age at ca.1084 Ma;992–554 Ma,with a peak age at ca.939 Ma;521–421 Ma,with a peak age at ca.445 Ma;418–253 Ma,with a peak age at ca.280 ***,the sources of the Longwuhe Formation include the northern margin of the WQO,the Qilian Orogen(QLO)and the basement of the southern margin of the North China Block(NCB),of which the ancient basement of the southern margin of the NCB is the main source area of the Longwuhe *** with previous studies,we propose that the Longwuhe Formation was formed in a fore-arc basin,which is related to the closure of the A’nyemaqen-Mianlüe Ocean from the Early Permian to Early–Middle Triassic due to the northward subduction-collision of the Yangtze Block(YZB).This also indicates that the A’nyemaqen-Mianlüe Ocean has flat subduction characteristics.

关键词： West Qinling orogenic belt Early Triassic paleo-Tethyan Ocean geochronology zircon

Late Cambrian SSZ-type Ophiolites in Acite Zone, East Kunlun Orogen of Northern Tibet Plateau: Insights from Zircon U-Pb Isotopes and Geochemistry of Oceanic Crust Rocks

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Acta Geologica Sinica(English Edition) 2017年第S1期91卷 66-67页

作者： li Ruibao PEI Xianzhi li zuochen PEI Lei CHEN Guochao CHEN Youxin liU Chengjun School of Earth Science and Resources Chang’an UniversityXi’anShaanxi 710054China Key Laboratory of Western China’s Mineral Resources and Geological Engineering Ministry of EducationXi’an 710054China Nanyang Institutte of Technolog School of Civil EngineeringyNanyangHenan 473000China

1 Introduction East Kunlun orogen(EKO)stretching more than 1000km in E-W extension is located in the western segment of Central Orogen Belt(COB),China(Xu et al.,2006,li et al.,2014).There outcropped Cambrian ophiolites

关键词： SSZ Pb East Kunlun Orogen of Northern Tibet Plateau