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Trace element and sulfur isotope compositions of pyrite from the tianqiao zn–pb–ag deposit in Guizhou province,SW China:implication for the origin of ore-forming fluids

引用

Acta Geochimica 2022年第2期41卷 226-243页

作者： Yumiao Meng Xiaowen Huang Chunxia Xu Songning Meng State Key Laboratory of Ore Deposit Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081China School of Hydraulic and Ecological Engineering Nanchang Institute of TechnologyNanchang 330099China Applied Nuclear Technology in Geosciences Key Laboratory of Sichuan Province Chengdu University of TechnologyChengdu 610059SichuanChina

The tianqiao zn–pb–ag deposit in SW China,hosted by Devonian and Carboniferous limestone and clay rocks,is composed of sulfides such as sphalerite,galena,and *** is present in different paragenetic stages and can be divided into four types based on textures and mineral *** from the adjacent shanshulin deposit(Py-SSL)is also used for ***1 shows framboid texture with grain diameter up to 1 mm and was commonly replaced by ***2 is characterized by overgrowth texture and displays inner oscillatory ***2 is associated with abundant sphalerite and ***3 shows replacement relics textures where galena fills the fractures of ***4 is a euhedral to subhedral crystal disseminated in dolomite and is characterized by deformation and fragmentation *** sphalerite and galena are associated with ***-SSL is subhedral and disseminated in dolomite,similar to ***1 was formed by a diagenetic or sedimentary process,whereas Py2 and Py3 were formed by multiple stages of ore ***4 and Py-SSL were formed at the carbonate-sulfide stage,but Py4 suffered from deformation after its ***1,Py2,and Py3 are characterized by relative enrichment of Sb,Cu,and As,in contrast to Py4 and Py-SSL with higher Cr,W,Ge,Sn,Tl,Ni,and Ga ***,critical metals such as Ge,Ga,and In in pyrite are generally lower than10 ppm,which are not economically *** trace element variation in tianqiao pyrite with paragenesis results from fluid evolution in the pb–zn ore system and competition with co-precipitating *** and ore-forming hydrothermal fluids are responsible for the formation of different types of ***-related pyrite from the tianqiao and shanshulin deposits has Co and Ni distribution features similar to pyrite from sedimentary pyrite and submarine hydrothermal vents,different from those in volcanogenic massive sulfide,iron oxide-copper–gold,and porphyry Cu deposits,indicating their deriva

关键词： Trace elements Pyrite Sulfur isotopes tianqiao and shanshulin zn-pb-ag Origin of oreforming fluids

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