摘要
文章以泗人沟、南沙沟等铅锌矿床为例,讨论南秦岭志留系中铅锌矿床形成的地质地球化学特征。矿石稀土元素地球化学反映了矿石及金属硫化物矿物与地层的稀土配分曲线的一致性,说明成矿物质主体来自于地层;闪锌矿矿物的微量元素含量及一些特征值介于热液矿床和热水沉积矿床之间,属改造型;硫同位素组成结果表明矿石与地层硫同位素组成不一致,矿石较地层富集轻硫,可能反映了造山作用产生的热液使其硫同位素发生了一定程度的均一化或者有深源硫的参加,显示出矿石硫和地层硫的混合特征;流体氢氧同位素组成特征表明成矿介质可能是封存于深部的变质流体。这些矿床地球化学特点可能反映该区域铅锌矿床的最终定位与印支 燕山期的逆冲推覆构造有关。
In recent years, a series of lead-zinc deposits were explored in Silurian strata in South Qinling area. It is become more and more important in the whole Qinling metallogenic belt. For example of Nanshagou and Sirengou lead-zinc deposit, the paper studies their geological and geochemical characteristics. Ore REE curve and geochemical data is coincided with that of the host stratum indicating that ore materials come from the host stratum. Minor element composition and some characteristic value fall between hydrothermal and hot water sedimentay ore deposit types showing that it is a reformed deposit. Ore Pb isotope composition differs from that of the host and is riched in light sulfur reflect mix or hydrothermally homogeznization during orogeny. H, O isotope composition of fluid inclusion reveals that ore media may be the deeply sealed fluid. All this indicates that the ultimate location of the Pb-Zn deposit could be related to lndo-China-Yanshanian nappe.
出处
《地质找矿论丛》
CAS
CSCD
2004年第2期76-82,86,共8页
Contributions to Geology and Mineral Resources Research
关键词
志留系铅锌矿
同位素地球化学
微量元素地球化学
南秦岭
Silurian lead-zinc deposit
stable isotope geochemistry
microelement geochemistry
Nanqinling orogenic belt
