格陵兰岛中东部马尔姆杰格(Malmbjerg)斑岩型钼矿床研究进展  

New Research Advances of the Malmbjerg Porphyry Molybdenum Deposit in Central East Greenland

作　　者：水新芳[1] 赵元艺[2] 李九玲[2] 卢伟[1] 

机构地区：[1]中国地质大学,北京100083 [2]中国地质科学院矿产资源研究所国土资源部成矿作用与矿产资源评价重点实验室,北京100037

出　　处：《地质科技情报》2013年第5期46-51,共6页Geological Science and Technology Information

基　　金：中国地质调查局项目"全球巨型成矿带区域构造与成矿地质背景对比研究"(1212011120326);中央地勘基金项目([2011]D3-09)

摘　　要：马尔姆杰格(Malmbjerg)斑岩型钼矿床位于格陵兰岛东岸古近纪火成岩省中,是靠近始新世沃纳布杰格(Werner Bjerge)杂岩体中3个钼矿床中最大的一个。马尔姆杰格矿床钼金属储量约26万t,辉钼矿化呈细脉-网脉状分布于岩体及其围岩中。与矿化有关的围岩蚀变有钾长石化、硅化、云英岩化、黄铁矿化等,具有斑岩型钼矿床的一些基本特点。矿床中辉钼矿ReOs年龄(25.8Ma)与黑云母花岗岩40 Ar/39 Ar年龄(25.7Ma)在误差范围内一致,表明辉钼矿矿化与花岗岩侵位是同时发生的,均为古近纪产物,与冈底斯成矿带中新生代斑岩成矿系统晚碰撞期发育的矿床形成时代较接近。马尔姆杰格斑岩型钼矿床形成于裂谷后期地壳抬升过程中该区最新的岩浆活动阶段,矿床外围及南部是重要的找矿远景区。The Malmbjerg molybdenum deposit is located in Palaeogene East Greenland magmatic province. The Malmbjerg deposit has a proven reserve of more than 260 000 tonnes Mo with a grade of 0.20%. Mineralization of the deposit consists of quartz-molybdenite veinlets and stockworks which occur in the altered porphyry and sedimentary rocks. Hydrothermal alteration is well developed and is composed of potassic feldspar alteration, silicification, sericitization, and pyritization, which is typical for porphyry Mo deposits. The good agreement between the Re-Os age for Malmbjerg molybdenite （25.8 Ma） and the 40Ar/39Ar age for biotite from the mineralized granite stock （25.7 Ma） in this study suggests that mineralization is genetically related to this younger intrusive event. In this paper we show that the deposit formed during the latest phases of igneous activity in the area （apart from minor mafic diking） during post rift-related crustal uplift. They are the most important ore-exploration prospect areas in the peripheral and south of the Malmbjerg molybdenum deposit.

关 键 词：古近纪 钼矿床 马尔姆杰格 东格陵兰 

分 类 号：P618.65[天文地球—矿床学]