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re-os dating,and Pb-H-O isotope characteristics,of the Abra Cu-Ag-Pb-Au polymetallic deposit in Western Australia

Acta Geochimica 2021年第5期40卷 739-751页

作者： Chaozhuang Xi Minghong Zheng Ling He Haodong Xia School of Civil Engineering Hunan City UniversityYiyang 413000HunanChina Hunan Engineering research Center of Structural Safety and Disaster Prevention for Urban Underground Infrastructure Yiyang 413000HunanChina Non-Ferrous Metals and Nuclear Industry Geological Exploration Bureau of Guizhou Guiyang 550005China Tianjin North China Geological Exploration Bureau Tianjin 300170China Ministry of Land and resource Geological Information CentreYanjiao 065201China

The Abra deposit,a large lead-silver-copper–gold polymetallic deposit in Western Australia,is located at the eastern of the metallogenic belt of the Jillawarra basin in the Bangemall basin.The 4 th to the 6 th rock section of the Irrigully Group of Edmund Series are the principal ore-host strata,composed mainly of sandstone and fine sandstone.The orebody in Abra can be classified into two types as upper layer-like lead-silver and lower veins or netvein copper–gold.The metal minerals are mainly galena,chalcopyrite,and pyrite,while the gangue minerals are mainly quartz,dolomite,and barite.Both reos isotopic age of the pyrite(1329.5±98 Ma)with the initial(187os/188os)=5.0±3.8 and Pb isotopic compositions(206 Pb/204 Pb=15.914–15.967,207Pb/204Pb=15.425–15.454,208Pb/204Pb=35.584–35.667)suggests that the metal minerals were sourced from the wall-rocks.d DV-SMOWvalues of quartz range from-35%to-17%whereas d18 OV-SMOWvalue range from 12%to 16%which indicates that the ore-forming fluids of Abra were mediumlow temperature and medium–low salinity,and were mainly metamorphic water and secondary atmospheric precipitation.When the medium–low temperature oreforming fluids are mixed with oxidizing reducing fluids carrying a large number of metal substances,a large number of ore-forming substances will be precipitated when the physical and chemical conditions change,thus it can be considered that the Abra deposit is a medium–low temperature hydrothermal polymetallic deposit.

关键词： re-os isotope Pb–H-O isotope Abra cu-ag-pb-au polymetallic deposit Australia

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re-os Geochronology of the Liuchapo Formation across the Ediacaran-Cambrian Boundary of the Yangtze Block(South China)

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Journal of Earth Science 2022年第1期33卷 25-35页

作者： Yong Fu Fuliang Wang Chuan Guo Chao Li Peng Xia College of resource and Environmental Engineering Guizhou UniversityGuiyang 550025China Key Laboratory of Karst Georesources and Environment Ministry of EducationGuizhou UniversityGuiyang 550025China Guizhou Geological Environment Monitoring Institute Guizhou 550081China National research Center for Geoanalysis Chinese Academy of Geological SciencesBeijing 100037China

The Ediacaran-Cambrian(E-C) succession in South China records remarkable oceanic,biological and geochemical variations,but it was not well defined geochronologically,which hinders the interpretation of the spatio-temporal seawater chemical architecture during the time E-C interval.This study presents two re-os isochron ages of 520.2±6.1 and 561.7±8.5 Ma for the barite-rich black shales from the top Liuchapo and Doushantuo formations respectively in Tianzhu County,Guizhou Province.In combination with existing age data,the two new re-os isochron ages suggest that the Liuchapo Formation was deposited between 550 and 520 Ma.Moreover,like the polymetallic Ni-MoPGE layers of shelf margin(or platform) facies and V-rich horizons of transitional(or shelf slope) to deep-water facies,the barite deposits were likely formed due to differential mineralization.The timing offset likely resulted from differential elemental concentration related to certain local factors(i.e.,hydrothermal fluids,seawater redox and biological activity).The isochron-derived initial ^(187)os/^(188)os ratios of the top Liuchapo Formation(0.902 ± 0.048) and the Doushantuo Formation(0.740 ± 0.042) fall within the range of continental weathering flux(1.54) and oceanic crust(0.126),implying the involvement of marine hydrothermal fluids.Moreover,their difference of initial ^(187)os/^(188)os ratios may reflect variations of continental weathering intensity and uplift magnitude.

关键词： geochemistry Ediacaran-Cambrian initial^(187)os/^(188)os Liuchapo Formation re-os isotope Yangtze Block

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Late Jurassic Cu-Mo Mineralization at the Zhashui-Shanyang District,South Qinling,China:Constraints from re-os Molybdenite and Laser Ablation-Inductively Coupled Plasma Mass Spectrometry U-Pb Zircon Dating

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Acta Geologica Sinica(English Edition) 2011年第3期85卷 661-672页

作者： LI Qiugen LIU Shuwen WANG Zongqi WANG Dongsheng YAN Zhen YANG Kai WU Fenghui Key Laboratory of Orogenic Belts and Crustal Evolution Ministry of Education School of Earth and Space Sciences Peking University Beijing 100871 China Institute of Geology Chinese Academy of Geological Sciences Beijing 10003 7 China Institute of Mineral resources Chinese Academy of Geological Sciences Beijing 100037 China Northwest Mining and Geological Exploration Bureau for Nonferrous Metals Xi＇an 710054 China

The Zhashui-Shanyang district is one of the most important sulfide deposits in the Qinling Orogen where the formation of porphyry-skarn Cu-Mo deposits has a close genetic link with the Yanshannian magmatism.Laser Ablation-Inductively Coupled Plasma Mass Spectrometry（LA-ICP-MS） U-Pb zircon dating of two granodiorite intrusions（Xiaohekou and Lengshuigou deposits）was investigated in the Zhashui-Shanyang district and the rock-forming ages obtained from 148.3±2.8 to 152.6±1.2 Ma,averaging 150.5 Ma,accompanied by a younger disturbance age of 144.3±1.7 Ma in the Lengshuigou intrusion,which is in excellent agreement with published sensitive high resolution ion micro-probe（SHRIMP）zircon date on the later monzodiorite porphyry phase in the Lenshuigou deposit.Two samples were selected for molybdenite ICP-MS re-os isotopic analyses from the Lengshuigou granodiorite porphyry,yielding re-os model ages from 149.2±2.7 Ma to 150.6±3.4 Ma, with a weighted mean age of 149.7±2.1 Ma.These mineralization ages overlap rock-forming ages of the host intrusions within the error range.This implies that the mineralization occurred in the Late Jurassic,which belongs to the tectonic phase B event of the Yanshan Movement,not Cretaceous as previously thought.Therefore,the Late Jurassic mineralization of the Zhashui-Shanyang district could be connected to the large-scale Yanshan molybdenum metallogenic period,the geodynamic regime of which is attributable to the far field response of convergence of surrounding plates,perhaps the approximately westward subduction of the Izanagi plate beneath the Eurasian continent.

关键词： re-os isotope molybdenite zircon porphyry-skarn Cu-Mo deposit Qinling

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Enrichment of Platinum-group Elements(PGE) and re-os Isotopic Tracing for Porphyry Copper(Gold) Deposits

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Acta Geologica Sinica(English Edition) 2014年第4期88卷 1288-1309页

作者： HE Xiaohu ZHONG Hong ZHU Weiguang BAI Zhongjie HU Wenjun State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of Sciences University of Chinese Academy of Sciences

Platinum-group elements （PGE） in PGE-rich porphyry copper （gold） deposits are mainly Pt and Pd, whereas the concentrations of other PGE （Ru, Rh, os, Ir） are significantly low. Moreover, Pt and Pd mainly exist in sulfides in the forms of crystal lattice or tiny platinum-group mineral （PGM） inclusions. The present data show that there is a positive relationship between Pt and Pd concentrations and Cu （Au） in porphyry copper （gold） deposits. The comparison of chondrite-normalized PGE distribution patterns between the ore-bearing porphyry intrusions and ore-barren porphyry intrusions in arc setting, 187^os/188^os, 87^Sr/86^Sr and S isotopes for porphyry copper （gold） deposits shows that PGEs were mainly derived from the mantle, and fluids from subduction zones devoted trivial PGE to the magma. The porphyry copper （gold） deposits associated with subducted events are most probably enriched in PGE, whereas those related to crustal thickening, lithospheric delamination or underplating rarely concentrate PGE. The osmium isotopic compositions in porphyry copper （gold） deposits reveal that （187^os/188^os）i values are highly variable and not lower than those of primitive upper mantle （PUM） and mantle peridotite, however, osmium concentrations are commonly lower than mantle peridotite, suggesting that parental magmas of some porphyry intrusions had experienced crustal contamination during magma evolution. Experimental investigations have proved that PGE exist in the forms of Cl^- and HS^- complexes during transportation and migration of the oreforming fluids. This paper summarizes previous studies including crucial controlling factors and mechanisms for PGE enrichment, and points out that the mantle-derived magmas parental to porphyry intrusions are the prerequisite for PGE enrichment in porphyry copper （gold） deposits. Favorable physical and chemical conditions （including salinity, temperature, pressure, pH, and oxygen fugacity） in hydrothermal fluids crucially control the PGE enrichment, and sulfur concentrations of melts p

关键词： PGE re-os isotope forms of migration enrichment process porphyry copper （gold）deposits.

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reconsideration of Neo-Tethys Evolution Constrained from the Nature of the Dazhuqu Ophiolitic Mantle, Southern Tibet

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Acta Geologica Sinica(English Edition) 2020年第S1期94卷 36-36页

作者： LIU Tong WU Fuyuan LIU Chuanzhou ZHANG Chang JI Wenbin XU Yang State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China

The nature(i.e., sub-oceanic, sub-arc or subcontinental) of ophiolitic mantle peridotites from the eastern Neo-Tethyan domain in southern Tibet has been hotly debated. This uncertainty limits our understanding of the history and evolution of the eastern Neo-Tethys Ocean. Here we present petrological, geochemical and re-os isotopic data for the mantle peridotites from the Dazhuqu ophiolite in the central segment of the Yarlung Zangbo suture zone, southern Tibet. Samples collected include both spinel lherzolites and spinel harzburgites. The lherzolites have spinel Cr~# [Cr/(Cr + Al), ~ 0.3–0.4] comparable to those of typical abyssal peridotites. In contrast, the harzburgites have spinel Cr~#(~0.3–0.7) overlapping with the ranges of both abyssal and fore-arc peridotites(Day et al., 2017;Parkinson and Pearce, 1998);two samples have spinel Cr~# higher than 0.6, which is probably ascribed to intense melt-rock interactions. Clinopyroxene trace element modeling indicates that the Dazhuqu mantle peridotites have experienced 0–6% garnetfacies melting followed by 10% –18% melting in the spinel stability field. This is similar to the degree of garnet-facies melting inferred for many abyssal peridotites(Hellebrand et al., 2002) and implies deep initial melting(> 85 km), which distinguishes the Dazhuqu mantle peridotites from fore-arc peridotites(commonly os/188 os of 0.11836–0.12922, which are commonly lower than the recommended value of primitive upper mantle(PUM)(Meisel et al., 2001). All but one samples yield relatively younger re depletion ages(TRD = 0.06–0.81 Ga) with respect to the only one sample having an older TRD age of 1.66 Ga. re-os isotopes and highly siderophile element(HSE) compositions of the Dazhuqu peridotites are similar to those of abyssal peridotites(Day et al., 2017) and the Oman southern massifs(Hangh?j et al., 2010) but are distinct from noncratonic sub-continental lithospheric mantle(SCLM) xenoliths and sub-arc mantle. We emphasize the s

关键词： Neo-Tethys Ocean sub-oceanic mantle re-os isotope mantle peridotite Dazhuqu ophiolite Yarlung Zangbo suture zone

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re-os isotopic constraint to the age of in komatiites in the Neoarchean Guyang greenstone belt,North China Craton

Re-Os isotopic constraint to the age of in komatiites in the...

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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...

作者： MA XuDong~(1*),GUO JingHui~1,CHEN Liang~2 & CHU ZhuYin~1 1 State Key Laboratory of Litho spheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China 2 State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi’an 710069,China

The 2.5 Ga Guyang greenstone belt is a major lithological unit in the northwestern part of the North China Craton.Komatiites have recently been identified to occur within the lower part of the meta-volcanic sedimentary sequence of the greenstone belt.The biggest komatiite near Guyang has been mapped out,which is 500 m long and 50 m wide lenticular block.re-os isotopic compositions of 9 samples were analyzed to date the komatiites.The os contents are from 0.88 to 2.63 ppb,identical with typical komatiites, and slightly lower than the normal mantle.The os/os ratios are from 0.1115 to 0.1197,which are lower enough to exclude the origin of Phanerozoic magma as widely developed in adjacent areas.The calculated re depletion model ages(T) are from 1346 to 2454 Ma,among them the oldest age of 2454 Ma gives the minimum evaluation for the formation age of the Guyang komatiite.Therefore,the komatiites are a part of the Guyang greenstone belt,indicating high degree melting of mantle during～2.5 Ga crustal growth event.

关键词： komatiite re-os isotope Guyang greenstone belt Archean North China Craton

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