西藏措勤县尼雄矽卡岩型铁铜矿田的发现及地质特征与找矿意义

Discovery, characteristics and significance of the Nyixung skarn iron-copper field in Coqên County, Tibet

西藏措勤县尼雄铁铜矿田位于冈底斯地块的北带,由尼雄超大型富铁矿和日阿中型铜矿构成,是在青藏高原首轮国土资源大调查1∶25万措麦区幅区域地质调查过程中发现的。它形成于板块俯冲、碰撞造陆到青藏高原新生代板内造山的重大构造转折过程中,成矿期为晚白垩世,是冈底斯北带新发现的最具有找矿潜力的超大型铁矿床。笔者以西藏措勤—昂仁地区富铁矿、铜矿评价资料为基础,分析了措勤县尼雄铁铜矿田的地质特征及其找矿意义。

Tectonically located in the north Gangdise tectono-metallogenic belt,the Nyixung skarn iron-copper field in Coqen, Tibet, is composed of the superlarge Nyixung iron deposit and intermediate-sized Ri＇a coper deposit. It was found during the regional geological survey of the 1：250000 Comai Sheet, Tibet, in the first-round of the land resource survey of the Qinghai-Tibet Plateau. The Nyixung iron-copper field originated in the process of major tectonic transition from plate subduction and collisional epeirogeny to Cenozoic intraplate orogeny with the of the Qinghai-Tibet Plateau. The metallogenic epoch is Late Cretaceous. It is a superlarge iron deposit largest ore potential in the north Gangdise belt. On the basis of the evaluation data from the rich iron and copper deposits in the Coqen-Ngamring area, the geological characteristics of the Ngixung iron-copper field in Coqen and its significance for ore prospecting and analyzed.