地质与勘探2017，Vol.53Issue(5)：880-888,9.
东昆仑夏日哈木铜镍矿床Ⅱ号岩体辉长岩形成年龄与找矿潜力
Formation Age of the Gabbro in No.Ⅱ Intrusion at the Xiarihamu Magmatic Ni-Cu Sulfide Deposit in the East Kunlun Orogenic Belt and its Prospecting Potential
摘要
Abstract
The Xiarihamu Cu-Ni sulfide deposit, containing ~1. 1 million tons of Ni metal, represents the most significant discovery in the history of global Ni exploration in the past two decades and is the second largest Ni deposit following the Jinchuan deposit in China. There are five mafic-ultra-mafic intrusions in the mining area. At present, all large-scale ore bodies with economic values have been discovered in the No. I intrusion, with 1. 1 million tons of Ni metal. Among the other four intrusions, the mineralization was found only in the No. II intrusion, which resulted from superposition of magma activities of a variety of tectonic systems. In lithology, gabbro dominates the No. II intrusion. LA-ICP-MS zircon U-Pb analysis of the gabbro yielded a diagenetic age of 385. 2 Ma. It is the product of the early Devonian magmatic activity, slightly younger than No. I intrusion. Howerver, the mag-matic Cu-Ni ores mostly exist in the Ol-pyroxite and peridotite, and there are generally no economically valuable ore bodies in the gabbro. In the Xiari-hamu mining area, gabbro is largely the surrounding rock of peridotite and pyroxenite which hold Cu-Ni ores. The Cu-Ni mineralization observed in the gabbro is just a manifestation of late magmatic activity. Combined with the regional geochronology, it is concluded that the formation of the Xairihamu su-per-large magmatic Cu-Ni sulfide deposit was associated with the early Devonian magmatic activity in the East Kunlun orogenic belt. The No. II mafic-ultramafic intrusion is dominated by gabbro, without good formation conditions of Cu-Ni ores, so it seems impossible to find Cu-Ni ore bodies with e-conomic values in the No. II intrusion.关键词
辉长岩/锆石年龄/铜镍矿床/找矿潜力/夏日哈木/东昆仑Key words
gabbro/zircon age/magmatic Ni-Cu sulfide deposit/prospecting potential/Xiarihamu/East Kunlun orogenic belt分类
天文与地球科学引用本文复制引用
段建华,张照伟,祁昌炜,王亚磊,钱兵,张江伟,弥佳茹,尤敏鑫,刘月高..东昆仑夏日哈木铜镍矿床Ⅱ号岩体辉长岩形成年龄与找矿潜力[J].地质与勘探,2017,53(5):880-888,9.基金项目
国土资源部公益性行业科研专项"拉陵灶火镍成矿赋矿机理及勘查技术研究示范"(项目代码:201511020)和中国地质调查局"东昆仑铜镍多金属资源基地调查"二级项目(项目编码:DD20160013)共同资助. （项目代码:201511020）
