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.
出处
《地球化学》
CAS
CSCD
北大核心
2004年第6期634-640,共7页
Geochimica
基金
国家自然科学基金(4010300740133010)
关键词
富硒碳质岩
硒矿物
赋存状态
渔塘坝
Se-rich carbonaceous rocks
seleni um minerals
mode of occurrence
Yut angba
