东天山成矿带斑岩铜矿和其他类型矿床找矿勘查

东天山地区横跨哈萨克斯坦与塔里木两大板块,是新疆最重要的有色金属、黑色金属和贵金属矿产地之一。经历了前震旦纪基底形成→震旦-泥盆纪古亚洲洋形成、消亡→石炭纪-早二叠世后碰撞造山→晚二叠世至今的陆内造山等阶段。主要成矿期为晚古生代早期(泥盆纪-二叠纪),成矿作用复杂、类型繁多。其中,北部形成岛弧斑岩型和火山岩型铜、钼、金矿,中部形成拉张火山岩型和矽卡岩型金、铜、镍、银矿,中南部形成前寒武纪结晶基底叠加改造的层控-热液型铅、锌、银矿,南部库鲁克塔格和北山地区形成拉张铜、镍、金矿。通过研究认为,东天山地区尤以铜、镍、钼矿产资源潜力很大,优选出28个矿找矿靶区。

Prospecting of Porphyry Copper and Other Types of Ore Deposit in the Eastern Tianshan Metallogenic Zone

As one of the most important minralization zones for nonferrous, ferrous and precious metals in China, the eatern Tianshan orogen straddles between the Kazakstan and the Tarim plates. The orogen has experienced formation of the Pre-Sinian basement, evolution of the paleo-Asian ocean during Sinian-Devonian, post collision orogeny during Carboniferous-early Permian and intracontinental orogeny from late Permian to now. The major ore-forming period is late Paleozoic and mineralization has been complicated. The major ore deposits in the eastern Tianshan are: porphyry copper and volcanic Cu, Mo and Au formed in an island-arc setting distributed in the northern part of the eastern Tianshan; volcanic and skarn Au, Cu, Ni and Ag in a rifting environment occurring in the central part; strata-bound and hydrothermal Pb, Zn and Ag deposit in the central-southern part and Cu, Ni and Au deposits in an extentional setting in the southern Kuruktag and Beishan. It is suggested that the eastern Tianshan has great potential for Cu, Ni and Mo deposits and 28 areas have been selected as target for further exploration.