摘要
西藏玉龙铜钼矿是三江地区玉龙成矿带上的超大型铜矿。随着矿区开采工作的启动,矿区外围的找矿工作也逐步展开。本文在矿区外围找矿项目中,采用高精度离子探针方法对矿区及外围的岩体进行了年代学测试,获得玉龙铜钼矿两件含矿黑云母二长花岗斑岩的成岩年龄分别为43.0±0.5Ma(MSWD=1.3)、43.8±0.7Ma(MSWD=2.6);矿区外围北部甘龙拉地区石英二长花岗斑岩成岩年龄为43.9±0.6Ma(MSWD=1.19),矿区外围南部的纳加扎地区黑云母二长花岗斑岩成岩年龄为41.4±0.6Ma(MSWD=1.6)。表明玉龙斑岩铜钼矿带岩体主要于中始新世沿碰撞产生的拉分盆地侵入、就位,并且具有由北向南逐渐演化的趋势。矿区北部地区具有一定的找矿潜力。结合三江地区其他矿床的年代学数据和动力学背景,认为以玉龙铜钼矿为中心往北及往南均存在较大的找矿潜力。
Yulong deposit is a super-large scale porphyry copper-molybdenum deposit in the Jin sha jiang-Hong he. In this paper, SHRIMP U-Pb technique was applied to date the ages of ore-hosted rocks and metallogenic process. The two dating results of ore-hosted biotite-feldspars porphyry are 43.0±0.5 Ma （MSWD= 1. 3） and 43. 8±0. 7 Ma（MSWD= 2. 6）. The age of quartz-feldspars porphyry rock which located in the north of Yulong deposit is 43.9±0.6 Ma（MSWD= 1.19）. And the age of biotite-feldspars porphyry rocks which located in the south of Yulong deposit is 41. 4±0. 6 Ma（MSWD= 1. 6）. These results show that the main intruding episode of Yulong cu-hosted porphyry is about 43Ma. And there is a trend in the Yulong porphyry copper metallogenic belt that the episodes of the intruding rocks become younger from north to south. And the other diagenesis and mieralization ages of Yulong porphyry copper belt indicate that some other Cu-Mo-Au deposits could be find out.
出处
《地质学报》
EI
CAS
CSCD
北大核心
2009年第10期1445-1455,共11页
Acta Geologica Sinica
基金
国家基础研究计划"973"项目"印度-亚洲大陆主碰撞带成矿作用"(编号2002CB412607)
西藏玉龙铜业有限股份有限公司勘探项目"玉龙铜矿I
II
V号矿体地质特征及其外围成矿规律和成矿预测研究"
中国地质大调查项目(编号1212010633903
1212010634002
1212010535804)资助的成果
