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Ordovician radiolarians from the Yinisala ophiolitic melange and their significance in western junggar, Xinjiang, NW China

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Science China Earth Sciences 2015年第10期58卷 776-783页

作者： ZONG RuiWen WANG ZiZhang GONG YiMing WANG GuoCan XIAO Long WANG ZhiHong FAN RuoYing State Key Laboratory of Biogeology and Environmental Geology China University of Geosciences State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences

The Yinisala ophiolitic melange is located in the southern part of the Xiemisitai Mountains in western junggar （NW China）, and is composed of mafic-ultra mafic rocks, siliceous blocks, marble （marbleized limestone） and pyroclastic rocks, which all crop out as faulted blocks. Rich radiolarian and sponge spicule fossils are found in the siliceous rock for the first time. There are six genera of radiolarians （including one gen. et sp. Indet.） belonging to two families： Inaniguttid gen. et sp. Indet., Inani- gutta sp., Inanibigutta sp., Inanihella bakanasensis （Nazarov）, Triplococcus acanthicus （Danelian and Popov）, Antygopora sp., which are identified to be of late Early to Middle Ordovician age, representing the upper limit of the formation age of the Yinisala ophiolite melange. The ophiolites were developed in the Early Cambrian-Middle Ordovician oceanic environment, probably an important part of the early Paleozoic Paleo-Asian Ocean, based on the composition and structure of the siliceous rock and associated deep-water fossils. The Yinisala, Taerbahatai, and Hongguleleng ophiolitic melange belts can be correlated as a suite of unified subduction accretionary complex, which extends eastward to the eastern junggar. We consider that there existed an ancient ocean connecting the east and west of northern junggar in the Early Cambrian-Middle Ordovician.

关键词： western junggar Yinisala ophiolitic melange belt radiolarians Ordovician siliceous blocks

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A Devonian to Carboniferous intra-oceanic subduction system in western junggar,NW China

A Devonian to Carboniferous intra-oceanic subduction system ...

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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： Ji’en Zhang~(a,b),Wenjiao Xiao~(a,b,*),Chunming Han~a,Qjgui Mao~c,Songjian Ao~(a,b), Qianqian Guo~(a,b,d),Chong Ma~(b,d) a State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China b Xinjiang Research Center for Mineral Resources,Urumqi 830011,China c Beijing Institute of Geology for Mineral Resources,Beijing 100012,China d Graduate University,Chinese Academy of Sciences,Beijing 100049,China

The Devonian and Carboniferous rock assemblages in western junggar,southern Altaids,include ophiolitic melanges and coherent *** Baijiantan,Yeyagou and Dagun Devonian gabbros and one group of volcanic rocks(typeⅠlava) generally crop out as blocks in a matrix of ultramafic rocks and/or *** have a depleted light rare earth element(LREE) and mid-oceanic ridge basalt(MORB)-like signature with a small negative Nb anomaly,suggesting formation in a back-arc *** group of volcanic rocks(typeⅡlava) from Baijiantan,Yeyagou,western Karamay and Maliya includes alkaline basalt,basanite,andesite,dacite and trachyte that contain microphenocrysts of clinopyroxene-plagioclase,amygdales filled with chalcedony and calcite,and accessory pyrite and *** typeⅡlavas are further subdivided into five sub-types:(1) TypeⅡ lava is strongly enriched in LREE with incompatible trace element ratios similar to oceanic island basalt (OIB),suggesting derivation from enriched mantle.(2) TypeⅡ lava and tuff are slightly LREE-enriched,with a marked negative Nb anomaly and Th/Yb-enrichment indicating that they were generated in a supra-subduction zone(SSZ).(3) TypeⅡ lava is also moderately enriched in LREE suggesting derivation from a more-enriched MORB mantle.(4) TypeⅡ lava is enriched in LREE and has high Nb/Yb values close to those of *** is extensively depleted in Nb suggesting a source containing a mixture of enriched and SSZ mantle.(5) TypeⅡ lava has MORB-like REE patterns,and Nb/Yb and Th/Yb *** on field structural data,and the contemporaneity of the Baogutu adakite,a high-Mg diorite dike and the Miaoergou charnockite,these enriched and depleted magmatic features suggest generation in an intra-oceanic subduction zone influenced by ridge-trench *** Altaids in western junggar are characterized by multiple intra-oceanic subduction systems,which may have continued to operate to the late Carboniferous.

关键词： western junggar Melange Back-arc basin Intra-oceanic subduction Altaids

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A mixture of mantle and crustal derived He–Ar–C–S ore-forming fluids at the Baogutu reduced porphyry Cu deposit,western junggar

A mixture of mantle and crustal derived He–Ar–C–S ore-for...

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中国科学院地质与地球物理研究所2015年度（第15届）学术年会

作者： MingJian Cao KeZhang Qin GuangMing Li Noreen J.Evans HuaiYu He LuYing Jin Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences John de Laeter Center for Isotope Research Dept.Applied GeologyCurtin University Key Laboratory of the Earth’s Deep Interior Institute of Geology and GeophysicsChinese Academy of Sciences University of Chinese Academy of Sciences

Most large to huge porphyry Cu deposits(PCDs) are oxidized,making the Baogutu reduced porphyry Cu deposit(RPCD) a relative *** ore-forming fluids formed at several hydrothermal stages,however,their source is still *** address this issue,isotopic investigations of sulfide He–Ar–S and calcite C were *** inclusions hosted in sulfides(arsenopyrite,chalcopyrite and pyrite)showedHe/He ratios of 0.06–0.30 Ra(Ra is theHe/He ratio of air = 1.39 10),Ar/ Ar of 311–405,Ar?/He of 0.06–1.01,and F He ratios of 902–11,074(sample BGT-Py 2 yielded a ratio of 100),indicating a predominantly crustal source for the fluids with minor mantle input(less than 5%).The d C values of carbonate yielded a value of 7.8‰(n = 3),implying that CO was probably sourced from mantle or juvenile lower *** to the restricted sulfide d S values,the total S isotopic composition of the hydrothermal system was estimated to be 0.0–0.5‰,suggesting that the sulfur was derived from mantle or lower crust magmatic *** to the published granitoids Nd isotopic compositions at the Baogutu RPCD,fairly young TDMmodel ages(450–650 Ma) suggest that the granitoids were derived from partial melting of a juvenile basaltic lower ***,we propose that small proportion of mantlederived fluids(less than 5%),probably rise up and then mix with the fluids of juvenile lower crust under an extensional tectonic setting,forming the mantle-derived Sr–Nd–Pb–S–C but crustal He–Ar isotopic compositions.

关键词： Baogutu reduced porphyry Cu deposit He and Ar isotopes Carbon isotope Sulfide sulfur isotope western junggar

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Methane-rich fluid evolution of the Baogutu porphyry Cu-Mo-Au deposit,Xinjiang,NW China

Methane-rich fluid evolution of the Baogutu porphyry Cu-Mo-A...

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中国科学院地质与地球物理研究所第十届(2010年度)学术年会

作者： Ping Shen~(a,*),Yuanchao Shen~a,Jingbin Wang~(a,b),Heping Zhu~a,Lijuan Wang~(a,b),Lei Meng~(a,b) a Key Laboratory of Mineral Resources,Institute of Geology & Geophysics,Chinese Academy of Sciences,P.O.Box 9825,Beijing 100029,China b China Non-ferrous Metals Resource Geological Survey,Beijing 100012,China

Baogutu is the first porphyry Cu-Mo-Au deposit discovered in western junggar,Xinjiang,NW *** ore-bearing intrusion is a dioritic intrusive complex that includes stage 1 diorites and minor stage 2 diorite *** stage 1 diorites have produced concentric potassic and propylitic alteration zone and overprinted phyllic alteration and host much of the Cu-Mo-Au mineralization at *** Baogutu porphyry Cu-Mo-Au deposit consists of unusually disseminated and minor vein-style mineralization. The fluid evolution occurred in stage 1 diorite from late magmatic stage to hydrothermal stage(stages 1B and 1C) is constructed based on alteration and fluid inclusion analysis by microthermometry,Raman Spectroscopy and Quadrupole Mass Spectrometer. Five fluid types are distinguished and they are L1(liquid-rich 2-phase),L2(liquid-vapor 2-phase),V1 (vapor-rich 2-phase),V2(mono-phase vapor),and H(multi-phase solid).The dominant inclusions rich in reductive CH plus HO while minor inclusions rich in CH and *** inclusions in quartz from the late magmatic stage contain the most brine inclusions and less other inclusions with CH-rich and HO-rich *** inclusions in quartz from stage 1B contain all fluid types and have CH-rich and CH + HO compositions with rare *** inclusions in quartz from stage 1C are characterized by more vapor inclusions without brine inclusions and a clear CO concentration in a few assemblages with CH + CO composition. Using microthermometry,we estimate fluid trapping conditions at T>400℃and P= 1500 to 3100 bar in late magmatic stage,T= 200 to 400℃and P = 50 to 320 bar in disseminated quartz in stage 1B,T= 180 to 400℃and P = 20 to 260 bar in vein quartz in stage 1B,and T= 170 to 400℃and P = 20 to 230 bar in stage *** late magmatic conditions are compatible with the fluid evolution as a result of CH-rich inclusions derived from mantle *** hydrothermal conditions in stages 1B and 1C with small P-T fluctuations are compatible wit

关键词： Methane-rich fluid inclusions The Baogutu porphyry Cu-Mo-Au deposit western junggar Xinjiang

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Thermal-tectonic history of the Baogutu porphyry Cu deposit,West junggar as constrained from zircon U-Pb,biotite Ar/Ar and zircon/apatite(U-Th)/He dating

Thermal-tectonic history of the Baogutu porphyry Cu deposit,...

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中国科学院地质与地球物理研究所2014年度（第14届）学术年会

作者： Guang-Ming Li Ming-Jian Cao Ke-Zhang Qin Noreen J.Evans Brent LA.McInnes Yong-Sheng Liu Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences Graduate University of Chinese Academy of Sciences CSIRO Earth Science and Resource Engineering John de Laeter Center for Isotope Research Dept. Applied Geology/Applied PhysicsCurtin University State Key Laboratory of Geological Processes and Mineral Resources Faculty of Earth SciencesChina University of Geosciences

Understanding postmineralization tectonic movements in porphyry deposits,is critical to interpreting the complete thermal-tectonic *** study reports new zircon U-Pb ages,hydrothermal biotiteAr/Ar age,and zircon and apatite(U-Th)/He ages from the Baogutu porphyry copper deposit,which,in conjunction with pre-existing geochronology and thermochronology and inverse modeling simulations,constrain the thermal-tectonic history of the *** LA-ICP-MS U-Pb concordia ages indicate a Late Carboniferous age of 320.1 ± 2.2 Ma for the diorite complex and 309.8 ± 2.2 Ma for the mineralized granodiorite *** biotite selected from a quartz-biotite-chalcopyrite vein yields a plateau age of 311.0 ± 1.8 Ma which agrees with the age of the granodiorite porphyry and a previously reported molybdenite Re-Os age,and suggests that hydrothermal fluid circulated about310 *** and granodiorite porphyry yield weighted mean zircon(U-Th)/He ages of200.6±5.7Ma and 241.1 ±8.1 Ma,respectively,with ages ranging from 221.0 Ma to 174.3 Ma and225.9 to 261.6 *** mean diorite and granodiorite porphyry apatite(U-Th)/He ages of87.4 ± 2.3 Ma and 120.0 ± 4.2 Ma were obtained with ages ranging from 68.9 Ma to 100.8 Ma,and from91.0 Ma to 152.0 Ma,*** wide range of zircon(U-Th)/He ages may be due to the combined effects of U and Th zonation and radiation damage,and radiation damage effect may also account for the wide range of apatite(U-Th)/He *** combined effects of depth and cooling due to meteoric water circulation contribute to an older(U-Th)/He age for the granodiorite porphyry,relative to the diorite.A five-episode cooling rate history for the diorite can be deduced by inverse model simulation:fast cooling—moderate fast cooling—relatively slow cooling—fast cooling again—very slow *** thermal and tectonic history of the wall rock indicates that it suffered significant far-field effects from the Qiangtang-Eurasia and Lhasa-Qiangta

关键词： western junggar Baogutu porphyry copper deposit Zircon U-Pb dating Ar/Ar dating Zircon(U-Th)/He dating Apatite(U-Th)/He dating Thermal-tectonic history

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