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《Geoscience》 2018-05
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Characteristics and Significance of Skarn Minerals of Mengya'a Pb-Zn Deposit in Tibet

WU Qiumin;CHEN Cuihua;TU Zonglin;ZHANG Yan;SONG Zhijiao;LAI Xiang;College of Earth Sciences,Chengdu University of Technology;No.403 Geological Party,Sichuan Bureau of Geology and Mineral Exploration and Development;  
Mengya'a lead-zinc deposit in Tibet is an important stratified or stratoid skarn deposit in the northern margin of Gangdise.Laigu Formation,the main ore-hosting strata,provides the main metallogenic material.The main skarn minerals consist mainly of wollastonite,pyroxene,garnet,hopfnerite,actinolite,epidote,chlorite etc.According to the association combination and replacement relationship of minerals,the authors infer that Mengya'a lead-zinc deposit experienced four stages,i.e.,early-skarn stage,late-skarn stage,quartz-sulfide stage and carbonation stage.Combining with mineral hand specimens and microscopic observation and the electron microprobe analysis,the authors analyzed the mineralogical characteristics of garnet,pyroxene and wollastonite.The results of electron microprobe analysis show that Mengya'a lead-zinc deposit in Tibet belongs to calcareous skarn deposit; the composition of garnet and pyroxene changed greatly,which respectively were And_(59.9-94.72)Gro_(0-37.87)( Pyr + Spe + Alm)_(0.87-6.78) and Di_(18.85-94.44)Hd_(3.39-70.58)Jo_(0.09-11.14); the mineral composition of wollastonite is Wo_(99.00-99.44)Fs_(0.37-0.78)En_(0.07-0.23).The garnets are mainly andradite-grossuthe,and the garnets always develop zoning structure.The pyroxene is diopside-hedenbergite series,and the wollastonite is pure.The skarn of Mengya'a deposit in Tibet is calcareous skarn.Its ore deposit experienced multi-stage and multi-order evolution of hydrothermal fluid during its formation,and the forming environment of the deposit also is not a stable close system.The mineral composition characteristics of skarn indicate that the metallogenic environment of Mengya'a Pb-Zn deposit was a low acid and oxidation-weak oxidation environment.
【Fund】: 四川省教育厅项目(SZX040);; 中国地质调查局项目(12120113036200);; 国家自然科学基金项目(41372093)
【CateGory Index】: P618.4
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