摘要
冰洞山锌矿是鄂西地区层控型铅锌矿最具代表性的矿床之一,矿床形成具有全球同类型矿床相同的成矿大地构造背景。主要控矿因素为震旦系陡山沱组白云岩角砾岩、潮坪相沉积环境、同沉积断层以及滑动拆离断层。Pb、Zn、Ag异常强度高,套合性好。元素组合简单,主要为Pb-Zn-Ag-Cd(-Cu),反映出沉积型矿床元素组合特点。蚀变较弱,主要为硅化、碳酸盐化。同位素和包体资料表明,矿床具沉积型矿床特点。矿物组合和矿石结构构造特征反映矿床的形成有两期成矿作用。矿床成因为沉积—改造型。
Bingdongshan Zinc deposit is one of largest stratabound Lead-Zinc deposits in western Hubei Province. The deposit has formed in same metallogenetic geotectonic background with the valley-type（MVT） Lead-zinc deposits all over the world. The study suggests that formation and distribution of Lead-Zinc orebody was jointly controlled by breccia of dolomite in Doushantuo Formation sedimentary rocks in Sinian, sedimentary environment of tidal plat facies, syndepositional fault and sliding-detachment fault. The elements of lead, zinc and silver appear to be extraordinary high in district and coincide with each other well;the elements are combined simply,mainly by Pb-Zn-Ag-Cd-（Cu） ,which reflects the characteristic of sedimentary deposits. The degree of alternation is found to be feeble ,just including carbonation and solidification. The data of isotope indicates that sulfur come from sulfate of seawater. A part of lead come from up-earth＇ s crust, some come from sediment strata. The fluid inclusion data suggests that the characteristic of temperature and salinity accord with MVT deposits. Ore-bearing fluid is composed with hot water from deep of earth and hot saline fluids. Base on the characteristics of paragenetie association of minerals and ore structure, it is conclude that formation of deposit at least has experienced two mineralization period, So we consider it as a sediment-alternation deposit.
出处
《资源环境与工程》
2009年第2期89-94,113,共7页
Resources Environment & Engineering
关键词
神农架
冰洞山
铅锌矿床
沉积-改造型
矿床模型
Shenlongjia
Bingdongshan
lead-zinc deposit
sedimentary--alternation type
deposit model
