恩施渔塘坝富硒碳质岩中硒的赋存状态  

Modes of occurrence of selenium in bl ack Se-rich rocks of Yutangba

作　　者：朱建明[1] 李社红[1] 左维[1] I.Sykorova 苏宏灿 郑宝山[1] J.Pesek 

机构地区：[1]中国科学院地球化学研究所环境地球化学国家重点实验室 [2]Institute of Rock Structure and Mechanics ASCR VHoleovi.kách41,18209 Prague 8,Czech Republic [3]湖北省恩施州卫生防疫站 [4]Faculty of Science Charles University of Prague Albertov 6,Praha 2,12843 Czech Republic

出　　处：《地球化学》2004年第6期634-640,共7页Geochimica

基　　金：国家自然科学基金(4010300740133010)

摘　　要：在渔塘坝富硒碳质岩中发现了自然硒及其系列硒矿物的组合。这些硒矿物有自然硒、方硒铜矿、硒铜蓝、水硒铁石、硒银矿、含硒黄铁矿、含硒黄铜矿和难以确定名称的Fe-Se矿物。其中自然硒、方硒铜矿和硒铜蓝的矿物组合主要分布在断层面附近的碳质硅质岩中,自然硒与方硒铜矿的矿物组合主要分布在高碳质泥岩中,水硒铁石及未确定的Fe-Se矿物主要赋存于露头处的富硒碳质岩中。硒矿物中除自然硒较普遍地存在外,其他矿物并不是均匀地分布于富硒碳质岩中,而是局部性地出现。Cu-Se矿物的大量发育表明铜可能在硒的表生迁移转化中起着某种重要的作用。Yutangba,located in the northern part of Shuanghe Town of Enshi City in SW Hubei Province,is an area of high-Se in China,and it is also the only site in the world where a sudden o ccurrence of Se poisoning took place.Selenium is present mainly in the bla ck Se-rich rocks(carbonaceous chert and carbonaceou s shale)of Upper Permian Maokou Formation which is 210m north of Yutangba.In Se-rich rock s,native selenium and copper(iron)selenide assemblages have been disc overed.These minerals include nati ve selenium,krutaite,klockmannite,mandarinoite,naumannite,Se-bearing pyrite,Se-bearing chalcopyrite and unidentified Fe-Se minerals.Of them,the assemblage of native selenium,k rutaite and klockmannite is mainly l ocated within the carbonaceous chert near the fault surface,and so are Se-bearing pyrite and Se-bearing chalcopyrite.However,the assemblage of native selenium and krutaite is just found i n carbonaceous mudstone.Mandarinoite and unidentified Fe-Se minerals can be found in the weathered carbonaceous chert that was exposed.Our results i ndicate that native selenium widely exists,and other selenium minerals and their assemblages are discrete in black S e-rich rocks and only found in some sp ecial sites.That Cu-Se minerals are easil y found also shows that copper may pla y a significant role in the geochemic al mobility and transformation of sele nium in the supergene environment of Yutangba.

关 键 词：富硒碳质岩 硒矿物 赋存状态 渔塘坝 

分 类 号：P595[天文地球—地球化学] P575[天文地球—地质学]