格陵兰岛西南部Nassaq地区辉钼矿Re-Os年龄及意义

Re-Os Dating of Molybdenite from the Nassaq Area,Southwest Greenland and Its Geological Significance

格陵兰矿产资源丰富,种类繁多,目前已探明的金属矿点(床)有800多个,具有巨大的找矿潜力,世界主要矿业公司多数对格陵兰的找矿与开发表现出积极态度。因此,选择典型地区开展深入研究对进一步找矿有重要的理论指导意义。格陵兰西南部的那萨克(Nassaq)地区交通较为便利,本文在对该地区系统的野外地质特征研究基础上,采集了含辉钼矿斜长角闪岩样品,并从中选择代表性样品,进行辉钼矿Re-Os年代学研究,为其成矿作用及相关问题的研究提供基本依据。该地区辉钼矿的形成年龄为2553 Ma,为新太古界末期的产物,其矿化是Qorqut花岗岩侵入时(2550Ma)所形成,在格陵兰西南部应重视Qorqut花岗岩有关的辉钼矿的找矿与评价工作。

The mineral resources are rich in Greenland. More than 800 metal deposits or points have been proven. It has important prospecting potential, and many major world~ mining companies positively participate in the prospecting and development. Therefore, it has important theoretical significance that selecting typical areas to carry out in-depth study for further prospecting. The traffic of Nassaq, southwest Greenland is convenient. Based on the systematic field geological survey, we collected amphibolite rock samples containing molybdenite. And then researched the Re-Os geochronology, providing the fundamental basis for the study of the mineralization and related issues. The age of molybdenite formation is 2553 Ma, a product of the late Neoarehean. The mineralization occurred when Qorqut granite intruded. We should pay attention to the prospecting and evaluation of molybdenite related Qorqut granite in the southwestern Greenland.