赣东北东乡铜矿侵入岩与成矿年龄的确定及意义

发布时间：2018-04-20 12:36

本文选题：流体包裹体 + Rb-Sr等时线　；参考：《地球科学》2017年09期

【摘要】：对于赣东北地区东乡铜矿床的成因机制,一直存在着海西期海底喷流沉积成矿作用与燕山期岩浆热液成矿作用的成因争议,获得精确的成矿年龄是解决这一成因争议的关键.利用LA-ICP-MS技术对矿区中与矿体伴生的花岗闪长斑岩进行了锆石U-Pb同位素定年,两个花岗闪长斑岩样品的形成年龄分别为164±2Ma、160±1Ma.同时对东乡铜矿床块状硫化物矿石中的石英,开展了流体包裹体Rb-Sr同位素定年研究,获得一条等时线年龄为161.8±9.6Ma(MSDW=1.3).结合对流体包裹体以及区域成矿作用的研究,认为该年龄可以代表东乡铜矿的形成时代.这些定年结果表明,东乡铜矿的形成可能与该区燕山期花岗闪长斑岩侵入活动带来的岩浆流体成矿作用有关.
[Abstract]:For the genetic mechanism of Dongxiang copper deposit in northeast Jiangxi, there has always been a dispute between Hercynian seafloor sedimentary mineralization and Yanshanian magmatic hydrothermal mineralization, and the key to solve the dispute is to obtain a precise metallogenic age. Zircon U-Pb isotopic dating of granodiorite associated with ore bodies in the mining area was carried out by using LA-ICP-MS technique. The age of formation of two granodiorite samples was 164 卤2 Ma-160 卤1 Ma, respectively. At the same time, the Rb-Sr isotopic dating of fluid inclusions in quartz from massive sulphide ores in Dongxiang copper deposit has been studied. An isochron age of 161.8 卤9.6 Ma-MSDW ~ (1. 3) has been obtained. Based on the study of fluid inclusions and regional mineralization, it is considered that this age can represent the age of formation of Dongxiang copper deposit. These dating results indicate that the formation of Dongxiang copper deposit may be related to the magmatic fluid mineralization caused by the Yanshanian granodiorite intrusion.
【作者单位】：南京大学内生金属矿床成矿机制研究国家重点实验室;南京大学地球科学与工程学院;南京大学地质流体研究所;南京地质矿产研究所;
【基金】：中国地质调查局项目(No.20089935) 国家重点研发计划(No.2016YFC0600206)
【分类号】：P597.3;P618.41

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