湘西新元古界—寒武系中锑砷存在相态研究  

Experimental Geochemical Study on Sb and As Spedations in the Neoproterozoic-Cambrian Strata in Western Hunan

作　　者：解庆林[1] 马东升[2] 裘丽雯[2] 赵美芳 刘英俊[2] 

机构地区：[1]桂林工学院环境科学系,541004 [2]南京大学地球科学系,210093

出　　处：《地质论评》1998年第1期77-82,共6页Geological Review

基　　金：国家自然科学基金;国家教委跨世纪优秀人才基金联合资助

摘　　要：应用部分提取技术研究湘西地区新元古界—寒武系中锑和砷元素的存在相态表明,岩石中以可交换离子、与碳酸盐有关、与硫化物有关和赋存于硅酸盐矿物晶格中4种形式存在的锑元素分别占岩石中锑总量的18.65％、0.85％、31.41％和43.81％;砷则分别为7.05％、4.29％、56.11％和29.18％。呈易迁移相态存在的锑和砷分别为55.91％和67.45％。在含硫开放体系中,岩石中元素的淋滤率与其中易迁移相态所占百分数值呈正相关关系。这为该区存在锑、砷矿源层的认识提供了实验证据。The speciations of antimony and arsenic in the Neoproterozoic-Cambrian strata in western Hunan have been studied with partial dissolution techniques. In rocks, Sb and As have four modes of occurrence: exchangeable, bound to sulfides, bound to carbonates and in silicate mineral lattice. The average percentages of the four fractions of antimony are 18. 65% , 0. 85% , 31. 41% and 43. 81%, respectively, and the average percentages of the four fractions of arsenic are 7. 05%, 4. 29%, 56. 11% and 29. 18%, respectively. The movable fractions of antimony and arsenic are 55. 91% and 67. 45%, respectively. The leaching rates of elements in the open sulfur-bearing system are approximately proportional to the percentages of movable fractions, which furnishes experimental evidence for the existence of source beds of antimony and arsenic in the region.

关 键 词：矿源层 新元古界 寒武系 锑 砷 存在相态 

分 类 号：P578.14[天文地球—矿物学]