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SIMS U-Pb zircon dating and re-os isotopic analysis of the Hulu Cu-Ni deposit,eastern Tianshan,Central Asian Orogenic Belt,and its geological significance

SIMS U-Pb zircon dating and Re-Os isotopic analysis of the H...

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中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： Chunming HAN Wenjiao XIAO Guochun ZHAO Ben-Xun SU Patrick Asamoah SAKYI Songjian AO Bo WAN Ji'en ZHANG Zhiyong ZHANG Institute of Geology and Geophysics Chinese Academy of Sciences Xinjiang research Center for Mineral resources Xinjiang Institute of Ecology and GeographyChinese Academy of Sciences Department of Earth Sciences The University of Hong Kong Department of Earth Science University of Ghana

Exploration of the Hulu Cu-Ni-Co sulfi de depo sit in Eastern Tianshan,Central Asian Orogenic Belt,has detected horizons of sulfide mineralization in pyroxenite and peridotite *** U-Pb zircon ages of the gabbro-hosting Cu-Ni-Co sulfide deposit indicate that the HUlu intrusion was emplaced at 282.3±1.2 Ma(95%confidence level,MSWD=3.30, n=13).osmium isotopic data suggest that the HUlu intrusion and associated Cu-Ni mineralization were derived from crustally-contaminated mantle *** intrusions clearly show island-arc geochemical signatures,such as negative Nb,Ta,Zr and Ti anomalies and enrichment in LILE,These geochemical tracers indicate that the Hulu mafic-ultramafic intrusions,along with the Cu-Ni deposit,formed as a result of subduction of oceanic crust in the Early *** arc-related geodynamic setting of the Hulu Cu-Ni deposit is unusual for magmatic sulfide *** new type of ore deposit offers an alternative perspective for Cu and Ni exploration.

关键词： Hulu Complex SIMS U-Pb zircon re-os isotopic data Cu-Ni deposit Eastern Tianshan Central Asian Orogenic Belt

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In-situ U-Pb,Hf and re-os isotopic analyses of the Xiangshan Ni-Cu-Co deposit in Eastern Tianshan(Xinjiang),Central Asia Orogenic Belt:Constraints on the timing and genesis of the mineralization

In-situ U-Pb,Hf and Re-Os isotopic analyses of the Xiangshan...

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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： Chunming Han~(a,*),Wenjiao Xiao~a,Guochun Zhao~b,Songjian Ao~a,Jien Zhang~a,Wenjun Qu~c,Andao Du~c a Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China b Department of Earth Sciences,The University of Hong Kong,Pokfulam Road,Hong Kong,China c National research Center of Geoanalysis,Beijing,100037,China

The timing and genesis of the major Ni-Cu-Co sulfide deposit in the Xiangshan intrusion have been studied based on newly obtained in-situ U-Pb,Hf and re-os isotopic *** SIMS U-Pb zircon ages of the gabbro hosting the Ni-Cu-Co sulfide deposit indicate that the Xiangshan intrusion was emplaced at 279.6±1.1 Ma(95%confidence level,MSWD=1.30,n=15).On the basis of combined geological and geochronological evidence,we suggest that the Xiangshan and other adjacent Ni-Cu deposits were formed in the same *** have low common os concentrations and high re/os ratios,similar to sulphide ores from the Duluth,Sally Malay and Voisey Bay *** re-os isotopic data from the disseminated and massive ores from the Xiangshan intrusion do not form a single isochron,as they have different initial os *** Hf and os isotopic data suggest that the Xiangshan intrusion and associated Ni-Cu-Co mineralization were derived from crustally contaminated mantle *** geochemical data show a tholeiitic affinity and a strong suprasubduction zone signature with negative Nb,Sr,and Ti anomalies similar to N-MORB and *** suggest that the mafic-ultramafic rocks and associated Ni-Cu mineralization of the Eastern Tianshan orogen formed in an Alaska-type subduction zone-arc *** diagnostic features of ridge-trench interaction are present in the Chinese East Tianshan orogen(***,adakites,high-Mg andesites,near-trench magmatism,Alaskan-type mafic-ultramafic complexes,high-temperature metamorphic belts that prograde rapidly from low-grade belts,and orogenic gold deposits).The above distinctive rock groups are probably related to the same thermal event,ridge subduction,as in the Cenozoic orogen of Alaska. We suggest that ridge subduction is the most plausible mechanism to provide the necessary *** subduction provides an important promising model for understanding many aspects of the evolution of the Chinese Eastern Tianshan orogen,and by inference,t

关键词： Xiangshan intrusion U-Pb geochronology Zircon re-os isotopic data

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