江西东乡铜矿床成因:铜和硫同位素联合约束

发布时间：2018-06-11 23:20

  本文选题：地球化学 + 成因　； 参考：《矿床地质》2017年01期

【摘要】：东乡铜矿床的赋矿岩石以石炭系砂岩和燕山期花岗斑岩为主。文章对东乡铜矿床同位素地球化学进行了研究,探讨了成矿物质来源及矿床成因。东乡矿区块状矿石和花岗斑岩的黄铁矿δ~(34)S值(0.3‰~1.2‰)非常接近深部地幔硫的值,其δ~(34)S值呈现明显的塔式分布,分布范围较窄,表明矿石中的硫主要来自深源岩浆。δ~(65)Cu值分布范围较窄(-2.10‰~0.17‰),整体接近于零附近,明显不同于块状硫化物矿床(δ~(65)Cu=-0.98‰~3.14‰)、矽卡岩型矿床(δ~(65)Cu=-1.29‰~2.98‰)和热液脉型矿床中δ~(65)Cu值(-3.70‰~0.44‰)的分布范围,其δ~(65)Cu值变化范围大于岩浆矿床的δ~(65)Cu值(-0.62‰~0.40‰),更接近于斑岩型矿床的δ~(65)Cu值(-1.16‰~0.81‰),表明东乡铜矿与岩浆热液作用具有密切的成因联系。因此,推断东乡铜矿为岩浆热液型矿床。
[Abstract]:Carboniferous sandstone and Yanshanian granitic porphyry are the main ore-bearing rocks in Dongxiang copper deposit. Isotopic geochemistry of Dongxiang copper deposit is studied in this paper. The 未 ~ (34) S value of pyrite in block ore and granitic porphyry in Dongxiang mine is very close to the value of sulfur in deep mantle, and the 未 ~ (34) S value of pyrite is very close to the value of sulfur in the deep mantle. The 未 ~ (34) S value of the ore and granitic porphyry is of obvious tower distribution, and the distribution range is relatively narrow. The results show that the sulfur in the ore mainly comes from the deep magma. The distribution range of 未 -2.10 鈥，

本文编号：2007111