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Re-Os(ICP-MS)dating of the massive sulfide ores from the Jinchuan Ni-Cu-PGE deposit

science china {2. sciences 2005年第10期48卷 1672-1677页

作者： YANG Gang1,2. DU Andao1, LU Jiren3, QU Wenjun1 & CHEN Jiangfeng2.1. National Research Center of Geoanalysis, Beijing 100037, china 2. laboratory for earth material cycling, {2. of earth and space sciences, university of science and technology of china, hefei 2.002., china 3. Institute of Mineral Resource, Chinese Academy of Geological sciences, Beijing 100037, china National Research Center of Geoanalysis university of science and {2. of china Chinese Academy of Geological sciences

Massive sulfide ore from the Jinchuan Ni-Cu-PGE deposit was dated by Re-Os technique using Carius Tube digestion, Os distillation, Re extraction by acetone and ICP-MS measurement. An isochron giving an age of 833 ± 35 Ma, initial 187Os/188Os ratio of 0.2.9 ± 0.018 (MSWD = 1.7) and γOs = 130 ± 15 is obtained. The Re-Os age obtained agrees, within analytical uncertainties, with previous SHRIMP zircon U-Pb age of 82. ± 8 Ma (n=5, MSWD = 4.3). The result suggests that the deposit was formed at Neoproterozoic and that the formation of the Jinchuan Ni-Cu-PGE sulfide deposit may be closely related to the plume activity, which were attributed to the breakup of the Rodinia supercontinent. The high γOs of the massive ores sug-gests that crustal material was involved in the formation of the Jinchuan deposit, however, the quantity of the added crustal material is less than 10%.

关键词： Jinchuan Ni-Cu-PGE deposit, Re-Os dating, ICP-MS.

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In situ U-Pb dating of xenotime by laser ablation(LA)-ICP-MS

In situ U-Pb dating of xenotime by laser ablation(LA)-ICP-MS

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中国科学院地质与地球物理研究所第11届（2.11年度）学术年会

作者： LIU ZhiChao~(1,2.,WU FuYuan~(1*),GUO ChunLi~3,ZHAO ZiFu~4,YANG JinHui~1 & SUN JinFeng~(1,2. 1 State Key laboratory of Litho spheric Evolution,Institute of Geology and Geophysics,Chinese Academy of sciences,Beijing 10002.,{2. 2.Graduate university of Chinese Academy of sciences,Beijing 100049,{2. 3 Institute of Mineral Deposits,Chinese Academy of Geological sciences,Beijing 100037,{2. 4 school of earth and space sciences,university of science and technology of {2.,hefei 2.002.,{2.

Xenotime is an ideal mineral for U-Th-Pb isotopic dating because of its relatively high U and Th contents,but typically low concentration of common *** characteristics,and the fact that it is widespread throughout various types of rocks,suggest that the U-Th-Pb dating of xenotime has broad *** of U-Pb dating on xenotime by ion microprobe(such as SHPJMP) have increased in recent years,whereas studies by laser ablation(LA)-ICP-MS are still *** this study,we developed a technique for U-Pb dating of xenotime using the 193 nm ArF laser-ablation system and Agilent 7500a *** evaluate the reliability of our method,a xenotime standard,BS-1,was analyzed and calibrated against another xenotime standard,*** weighted mean Pb/U ages of 510.1±5.2.Ma(2.,n = 2.),509.8±4.3 Ma(2.a,n = 2.) and 510.0±4.6 Ma(2.,n = 2.) were obtained using beam diameters of 16,2. and 32.m,*** ages are identical to those determined by ID-TTMS method(weighted mean Pb/U age of 508.8±1.4 Ma),which supports the reliability of our LA-ICP-MS *** also analyzed xenotimes in leucogranites from South Tibet and granites from Xihuashan in southern china,and obtained accurate and precise ***,we observed systematic differences in Pb/U fractionation among xenotime,monazite and *** matrix-effect resulted in either under-correction or over-correction of fractionation,and thus led to inaccurate ***,a matrix -matched material is required for U-Pb dating of xenotime by LA-ICP-MS.

关键词： xenotime laser ablation(LA)-ICP-MS U-Pb dating

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Re-Os dating of gold-bearing arsenopyrite of the Maoling gold deposit, Liaoning Province, Northeast china and its geological significance

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science Bulletin 2005年第14期 103-108页

作者： YU Gang1, YANG Gang1, CHEN Jiangfeng1, QU Wenjun2. DU Andao2.& HE Wei3 1. laboratory of Crust-Mantle materials and Environments, {2. of earth and space sciences, university of science and technology of china, hefei 2.002., china 2. National Research Center of Geoanalysis, Chinese Academy of Geo- logical sciences, Beijing 100037, china 3. 5th Geological Survey Party, Liaoning Province, Dashiqiao 115100, china

The Maoling gold deposit, one of the large gold deposits in eastern Liaoning Province, NE china, is an ar- senopyrite-disseminated gold deposit with a resource of ap- proximately 2. t Au and an average Au grade of 3.2.g/t. Six arsenopyrites closely related to Au mineralization of the Maoling gold deposit are dated by Re-Os technique and de- fine a Re-Os isochron with an age of 2.16±140 Ma, which suggests that the deposit was formed in the Paleoproterozoic era rather than in the Indosinian period as some early re- searchers suggested. High initial 187Os/188Os ratio of 1.32.0.48 indicates a crustal derivation of the ore-forming {2. of the deposit, which may be derived from rocks of the Gaixian formation of the Liaohe Group. Furthermore, the result also implies that the age of the Gaixian Formation in the Maoling district is older than 2.16±140 Ma.

关键词： Re-Os dating arsenopyrite Maoling gold deposit age of mineralization east of Liaoning Province.

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Mineral Zonations, Exsolutions and Melt Inclusions Record Complicated Evolutions of Garnet Pyroxenite from Raobazhai, North Dabie, Central-Eastern china

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吉林大学学报(地球科学版) 2015年第S1期 280-280页

作者： Sun He Xiao Yilin CAS Key laboratory of Crust-Mantle materials and Environments School of Earth and Space Sciences University of Science and Technology of China

The Raobazhai ultramafic massif,which exposed in the north Dabie,is thought to be a segment of subcontinental lithospheric mantle that was subducted and exhumed during the Triassic *** on these ultramafic rocks can provides intriguing information on geodynamic processes and material fluxes between mantle and crust during continent-continent collision,including the stages of subduction and *** this study we investigate in detail the Raobazhai garnet *** the basis of textural relations and

关键词： collision continent mantle garnet subduction crust intriguing Eastern Triassic north

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