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Journal of Earth Science 2016年第3期27卷 474-490页

作者： fuhao xiong Changqian Ma Hong’an Jiang Hang Zhang Key Laboratory of Tectonic Controls on Mineralization and Hydrocarbon Accumulation Ministry of Land and ResourcesCollege of Earth SciencesChengdu University of TechnologyChengdu 610059China State Key Laboratory of Continental Tectonics and Dynamics Institute of GeologyChinese Academy of Geological SciencesBeijing 100037China State Key Laboratory of Geological Processes and Mineral Resources China University ofGeosciencesWuhan 430074China Changsha Uranium Geology Research Institute CNNCChangsha 410007China

This study reports zircon U-Pb and Hf isotopes and whole-rock elemental data for granodiorites from the East Kunlun orogen. The zircon U-Pb dating defines their crystallization age of 235 Ma. The rocks are characterized by high-K calc-alkaline, magnesian and metaluminous with（K2O＋Na2O）=6.38 wt.%–7.01 wt.%, Mg#=42–50 [Mg#=100×molar Mg/（Mg＋Fe OT）], A/CNK=0.92–0.98, coupled with high εHf（t） values from-0.65 to-1.80. The rocks were derived from partial melting of a juvenile mafic crustal source within normal crust thickness. The juvenile lower crust was generated by mixing lithospheric mantle-derived melt（55%–60%） and supracrustal melt（40%–45%） during the seafloor subduction. Together with available data from the East Kunlun, it is proposed that the studied Middle Triassic granodiorites were formed in post-collisional extension setting, in which melting of the juvenile lower crust in response to the basaltic magma underplating resulted in the production of high-K granodioritic melts.

关键词： East Kunlun granodiorite geochronology Hf isotope magmatism

Syn-collision Biotite Hornblende Granodiorite from the Zedong Area,Tibet:Zircon U–Pb Isotope Chronology,Petro-geochemistry,and Geodynamic Significance

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Acta Geologica Sinica(English Edition) 2017年第2期91卷 515-529页

作者： ZHU Feilin SHI Zeming xiong fuhao NI Shijun BAI Mei College of Earth Science Chengdu University of TechnologyChengdu 610059SichuanChina Applied Nuclear Technology in Geosciences Key Laboratory of Sichuan Province(Chengdu University ofTechnology) Chengdu 610059SichuanChina Geological Survery lnstitute Chengdu University of TechnologyChengdu 610059SichuanChina

Cu–Au mineralization is rare in the Jurassic–Early Tertiary batholiths related to the India–Asia collision. Geochemical analysis and U–Pb isotope chronology was carried out on Shuangbujiere biotite hornblende granodiorite from the Zedong area. Zircon grains of the biotite hornblende granodiorite show oscillatory growth zonation and have high Th/U ratios of 1.08–2.39, indicating a magmatic origin for the zircons. Geochrological test yielded a LA-ICP-MS U-Pb age of 51.5±1.0 Ma, suggesting that the emplacement age of the biotite hornblende granodiorite is Early Eocene. The Shuangbujiere biotite hornblende granodiorites have geochemical features characteristic of adakite and are associated with a calc–alkaline metaluminous I-type granite enriched in Sr, high in Mg~#（49.6–54.9） and Sr/Y, and depleted in Y and Yb. These results indicate that this intrusion formation may have been associated with crustal thickening caused by the early collision of the Indian and Eurasian Plates. As the process of crustal thickening continued, the heating of the underplated basaltic magma caused the thickened lower crust amphibolite to dehydrate the melt and form a high-K calc–alkaline adakitic melt at about 848°C. Meanwhile, magma mixing of the underplated basaltic melt and high-K calc–alkaline adakitic melt formed a high-Mg# adakite representative of the sys-collisional tectonic setting.

关键词： chronology adakite thickened lower crust Zedong orefield Gangdese Tibet Proto-Tethys

Permian Radiolarians from the A'nyemaqen Mélange Zone in the Huashixia Area of Madoi County,Qinghai Province,Western China,and Their Implications on Regional Tectonism

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Journal of Earth Science 2016年第4期27卷 623-630页

作者： Zhigang Zhao Xing Huang xionghua Zhang Bing Yang Zhong-Qiang Chen fuhao xiong School of Earth Sciences China University of GeosciencesWuhan 430074China State Key Laboratory of Biogeology and Environmental Geology China University of GeoscieneesWuhan 430074China The 7th Gold Detachment of Chinese Armed Police Force Yantai 264004China Material Geological Data Center Ministry of Land and ResourcesLangfang 065201China

The Huashixia area in the Madoi County, Qinghai Province, western China is one of the most important areas for the studies of the formation and evolution of the A＇nyemaqen mélange zone due to the well exposed, relatively complete tectonostratigraphic successions. However, the timing and evolutionary process of the A＇nyemaqen paleo-ocean has long been poorly understood. Recently, we obtained abundant radiolarians from the siliceous rocks of the Maerzheng Formation of this mélange zone in Huashixia. Total 19 species in 10 radiolarian genera have been identified. They belong mainly to the Albaillellaria, Spumellaria, Entactinaria, and Latentifistularia. Four radiolarian assemblage zones are established, including： the Pseudoalbaillella rhombothoracata, Pseudoalbaillella scalprata, Ruzhencevispongus uralicus, and Follicucullus bipartitus-Follicucullus sp. cf. F. ventricosus zones. Radiolarian faunal correlations suggest a late Artinskian-early Kungurian age and late Capitanian-early Wuchiapingian age for the first two zones from the lower part and the last two zones from the upper parts of the Maerzheng Formation, respectively. All radiolarians are typical of deep water elements living in deep oceans in low latitudes during the Permian. Previously, the radiolarians of Early Carboniferous to Early Permian age and fusulinids of Early-Middle Permian age have also been reported from the A＇nyemaqen mélange successions. The combination of the newly found radiolarians with the previously reported faunal and microfloral assemblages as well as radiometric ages obtained from the same stratigraphic units indicates that the A＇nyemaqen paleo-ocean may have opened initially during the Early Carboniferous, expanded from the Early-Middle Permian, reached its acme in the early Late Permian, shrunk during the latest Permian to Early Triassic, and eventually was closed in the Middle Triassic.

关键词： Maerzheng Formation Permian A'nyemaqen paleo-ocean Qinghai-Tibetan Plateau.

First Discovery and Zircon U-Pb Dating of Early Ordovician Granitoids in Lincang Batholith, Western Yunnan： Implications for the Presence of Proto-Tethyan Orogeny in the Sanjiang Region, SW China

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Acta Geologica Sinica(English Edition) 2018年第1期92卷 404-405页

作者： XIAO Qianru xiong fuhao ZHAO Han FENG Xiujun WANG Qiang XIAO Yuanfu College of Earth Sciences Chengdu University of TechnologyChengdu 610059China Key Laboratory of Tectonic Controls on Mineralization and Hydroearbon Accumulation of Ministry of Land andResources Chengdu University of TechnologyChengdu 610059China

Objective The Lincang granitic batholith, extending over 370 km from north to south with an area of more than 10000 km2, is the major part of the Sanjiang region in western Yunnan, SW China, and is one key area to study the evolution of the Tethys. Previous studies all agreed that the Lincang batholith was formed in the Triassic, and widely considered its formation to be the result of Paleo- Tethyan orogeny （Dong et al., 2013）. However, the early Ordovician syenogranite has been discovered recently for the first tirne in the Lincang batholith, and its petrologic and geochronological results are presented here to provide evidence in support of its association with Proto-Tethyan orogeny. This new discovery has important significance lbr understanding the geodynamic history of the Lincang batholith and tectonic evolution of the Sanjiang region.

关键词： Lincang Batholith Western Yunnan

New Zircon U-Pb Dating of the Tuanliangzi Formation in South Lancangjiang Zone, Western Yunnan: Implications for the Tethyan Evolution of the Simao Block

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Acta Geologica Sinica(English Edition) 2019年第4期93卷 1154-1155页

作者： ZHAO Han XIAO Qianru YU Xiaoxuan xiong fuhao GONG Tingting WANG Qiang Key Laboratory of Tectonic Controls on Mineralization and Hydrocarbon Accumulation of Ministry of Natural Resources(Chengdu University of Technology) Chengdu 610059China College of Earth Sciences Chengdu University of TechnologyChengdu 610059China

Objective The Lincang area has witnessed complex history of the Proto-Paleo Tethyan *** attention has been paid on the Lincang granite batholith and Changning-Menglian suture.

关键词： Pb western New

Geology, Geochronology, and Hf Isotopic Composition of the Pha Lek Fe Deposit, Northern Laos: Implications for Early Permian Subduction-Related Skarn Fe Mineralization in the Truong Son Belt

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Journal of Earth Science 2019年第1期30卷 109-120页

作者： Lin Hou Shusheng Liu Linnan Guo fuhao xiong Chao Li Meifeng Shi Qiming Zhang Siwei Xu Songyang Wu Chengdu Center China Geological Survey Key Laboratory of Tectonic Controls on Mineralization and Hydrocarbon Accumulation of Ministry of Land and Resources Chengdu University of Technology National Research Center of Geoanalysis Chinese Academy of Geological Science China University of Geosciences

The Truong Son metallogenic belt in central Laos and Vietnam is an important Fe-Cu-Sn-Au polymetallic ore district. The Pha Lek Fe deposit is closely related to Late Carboniferous– Early Permian I-type granitic magmatism, and contains >50 Mt @ 45% to 50% of Fe ore. Ore minerals occur mainly as magnetite and hematite in the skarn alteration zone between a granitic pluton and metamorphosed Middle–Upper Devonian carbonates. The granitic pluton comprises granodiorite and granite, with zircon U-Pb dating indicating synchronous emplacement at 288.2±1.3 and 284.9±1.2 Ma, respectively. Zircons from these granitoids have ε_(Hf)(t) values of 2.9–11.2 and relatively young TDM2 ages(<1.0 Ga), indicating an origin by partial melting of depleted mafic crust or magma mixing. Previous studies have shown that these granitoids have high Y, Yb, and K_2O contents, and low Sr and Na_2O contents, which are interpreted as the melting of mafic continental crust. Pyrite of the main mineralization stage yields an ^(187)Re/^(188)Os-^(187)Os/^(188)Os isochron age of 287±17 Ma, indicating that mineralization is associated with Pha Lek granitic magmatism. A Late Carboniferous–Early Permian subduction-related skarn-type Fe mineralization model is proposed for the Pha Lek deposit. More evidence is needed to verify a hypothesis of volcanic overprinting during Late Triassic post-collisional extension.

关键词： Truong Son belt Pha Lek Fe deposit granitic intrusions geochronology Hf isotopic composition.

Two Contrasting Ophiolites in One Suture Zone: a Case Study from East Kunlun Orogenic Belt, North Tibetan Plateau

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Acta Geologica Sinica(English Edition) 2015年第A2期89卷 111-112页

作者： ZHANG Hang MA Changqian xiong fuhao JIANG Hongan LIU Bin GUO Pan Faculty of Earth Sciences China University of Geosciences Wuhan 430074 China State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Wuhan430074 China

Ophiolites are fragments of upper mantle and oceanic crust （Dewey and Bird, 1971; Coleman, 1977; Nicolas, 1989） that were consisting of mantle peridotites and a suite of magmatic rocks. Importantly,

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Geochronology and Geochemistry of the Triassic Mafic Complexes from the Western Garzê-Litang Ophiolitic Mélange and Implications for the Melt Evolution of a Continental Margin

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Acta Geologica Sinica(English Edition) 2015年第A2期89卷 50-51页

作者： LIU Bin MA Changqian ZHANG Xin GUO Pan ZHANG Hang xiong fuhao State Key Laboratory of Geological Processes and Mineral Resources China University ofGeosciences Wuhan430074 China Faculty of Earth Sciences China University of Geosciences Wuhan 430074 China

There is a general consensus that most ophiolites on the earth formed above a subduction zone and they often display a characteristic, sequential evolution of MORB to island arc tholeiities （IAT） to bonnites （Dilek et al., 2010, 2009; Pearce et al., 2003）. However, ophiolites occurred in a continental margin are very rare and usually have more complicated, irregular components, such as N-MORB,

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岩浆混合作用与火成岩多样性的耦合关系:以东昆仑造山带白日其利长英质岩体为例

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地球科学 2021年第6期46卷 2057-2072页

作者：陈兵熊富浩马昌前陈越黄虎成都理工大学地球科学学院四川成都610059 成都理工大学油气藏地质及开发工程国家重点实验室四川成都610059 中国地质大学地球科学学院湖北武汉430074

壳-幔岩浆相互作用如何影响长英质火成岩的岩石学多样性是当前岩石学研究的焦点问题之一.以岩石类型丰富的东昆仑白日其利长英质岩体和暗色微粒包体为研究对象,开展系统的锆石U-Pb年代学、矿物学、全岩元素地球化学和Sr-NdHf同位素研究... 详细信息

壳-幔岩浆相互作用如何影响长英质火成岩的岩石学多样性是当前岩石学研究的焦点问题之一.以岩石类型丰富的东昆仑白日其利长英质岩体和暗色微粒包体为研究对象,开展系统的锆石U-Pb年代学、矿物学、全岩元素地球化学和Sr-NdHf同位素研究,探讨和解析这一重要科学问题.LA-ICPMS锆石U-Pb年代学研究表明,暗色微粒包体(247.8±2.0 Ma)与二长花岗岩(247.5±1.4 Ma)、花岗闪长岩(248.8±2.1 Ma)和石英闪长岩(248.8±1.5 Ma)均侵位结晶于早三叠世.岩相学和矿物学研究表明,白日其利长英质岩石与包体的成因机制与壳-幔岩浆的机械或化学混合作用密切相关.元素地球化学和Sr-NdHf同位素组成研究揭示,幔源镁铁质岩浆端元起源于受俯冲板片流体交代的富集地幔熔融,而壳源长英质岩浆端元则起源于东昆仑古老的变质杂砂岩基底.岩石成因分析揭示,幔源镁铁质岩浆侵入长英质晶粥岩浆房,促使长英质晶粥发生活化,随后壳-幔岩浆端元以不同比例和不同方式发生机械和化学混合等相互作用,从而形成镁铁质岩墙、包体、石英闪长岩和花岗闪长岩等多种岩石类型.晶粥状态下壳-幔岩浆相互作用是控制东昆仑长英质火成岩多样性和大陆地壳生长演化的重要方式.

关键词：岩浆混合岩石多样性花岗岩暗色微粒包体东昆仑

东昆仑造山带索拉沟地区三叠纪赞岐质闪长岩的成因机制及其对古特提斯造山作用的启示

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地球科学 2021年第8期46卷 2887-2902页

作者：王巍熊富浩马昌前陈越黄虎成都理工大学地球科学学院四川成都610059 成都理工大学油气藏地质及开发工程国家重点实验室四川成都610059 中国地质大学地球科学学院湖北武汉430074

具有特殊成因机制的赞岐岩是探究深部岩浆动力学过程与区域构造演化的重要岩石探针之一.以东昆仑索拉沟地区赞岐质闪长岩为研究对象,开展系统的岩石学、年代学、元素地球化学和Lu-Hf同位素分析,厘定其岩石成因,揭示其对古特提斯造山作... 详细信息

具有特殊成因机制的赞岐岩是探究深部岩浆动力学过程与区域构造演化的重要岩石探针之一.以东昆仑索拉沟地区赞岐质闪长岩为研究对象,开展系统的岩石学、年代学、元素地球化学和Lu-Hf同位素分析,厘定其岩石成因,揭示其对古特提斯造山作用的启示.锆石U-Pb年代学分析表明,索拉沟闪长岩形成于中三叠世(~243 Ma).岩石具有较低含量的SiO2(50.26%~57.40%),较高的全碱成分(Na_(2)O+K_(2)O=3.5%~6.3%)、MgO(6.0%~7.1%)和Mg#值(50.1~60.9),属于高镁钙碱性准铝质岩石.索拉沟闪长岩具有较高的Sr(622×10^(-6)~1 041×10^(-6))、Cr(30×10^(-6)~161×10^(-6))和Ni(19×10^(-6)~79×10^(-6))以及中等的Y(7.6×10^(-6)~24.3×10^(-6))和Yb(0.62~1.87)含量,与典型的高镁安山质赞歧岩成分类似.岩石富集轻稀土和大离子亲石元素(如Rb、K和Pb),亏损高场强元素(如Ta、Nb和Zr),具有弧岩浆岩的化学属性.Lu-Hf同位素研究揭示,索拉沟闪长岩起源于富集岩石圈地幔(εHf(t)=-2.4~-0.4,TDM=0.89~0.99 Ga).岩石成因分析表明,东昆仑索拉沟中三叠世赞岐质高镁闪长岩形成于陆缘弧背景,岩浆起源于富集岩石圈地幔,且岩浆经历了以角闪石和黑云母为主的分离结晶作用.中三叠世是东昆仑造山带古特提斯洋壳俯冲和地体碰撞的构造转换阶段,索拉沟赞岐质高镁闪长岩可能是俯冲作用结束时板片断离的岩浆响应.

关键词：东昆仑三叠纪高镁闪长岩赞岐岩古特提斯地球化学地质年代学