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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。
Tibet Yulong copper and molybdenum ore is a super-large copper ore in the Yulong metallogenic belt in Sanjiang area. With the start of mining work, the prospecting work outside the mining area is also gradually started. In this paper, in the periphery ore prospecting project, the high-precision ion probe method was used to conduct the chronology test on the rock mass in the mine area and its periphery, and the diagenetic age of two ore-bearing biotite monzogranite porphyries in the Yulong copper- (MSWD = 1.3) and 43.8 ± 0.7Ma (MSWD = 2.6). The diagenetic age of the quartz-granodiorite porphyry in the Gaonangla area in the northern part of the mining area is 43.9 ± 0.6Ma (MSWD = 1.19) The diagenetic age of biotite monzogranite porphyry in the southern Nagarza region is 41.4 ± 0.6Ma (MSWD = 1.6). The results show that the Yulong porphyry copper-molybdenum belt rock intrusion mainly occurred in the mid-Eocene rifting basin, and it has a tendency to evolve from north to south gradually. The northern part of the mining area has certain prospecting potential. Combined with the chronological data and dynamic background of other deposits in Sanjiang area, it is considered that there is a great potential for prospecting both northward and southward with Yulong copper-molybdenum as the center.