新疆哈图-包古图金铜矿集区锆石年龄及成矿特点

Zircon age and metallogenic characteristics of the Hatu-Baogutu Au-Cu metallogenic concentric region in Xinjiang

晚古生代,新疆西准噶尔地区发生了强烈的构造-岩浆活动和广泛的金、铜成矿作用,形成了哈图-包古图大型金铜矿集区。锆石SHRIMP U-Pb年龄测量表明,含矿闪长岩体形成于312.3±2.2Ma～332.0±2.8Ma,矿集区岩浆活动及其成矿作用发生在石炭纪。哈图-包古图矿集区成矿作用有4个显著特点:(1)地幔流体活动强烈;(2)构造应力转化快速;(3)拉斑系列和钙碱性系列岩浆成矿;(4)多种矿化类型集中发育等。哈图-包古图矿集区发育石英脉型-蚀变岩型金矿床、斑岩型铜矿床和同期的石英脉型-蚀变岩型金矿床以及热液脉型铜金矿床的成矿系列。

The intensive tectonic-magma activity and extensive gold and copper mineralization occurred in the western Junggar,Xinjiang,in Late Paleozoic. It led to the formation of the large-sized Hatu-Baogutu gold-copper metallogenic concentric region. SHRIMP U-Pb dating of magma zircon from the ore-bearing diorite stocks in the Baogutu region indicates a range in age from 312.3±2.2Ma to 332.0±2.8Ma. The magma and hydrothermal mineralization of this metallogenic concentric region occurred in the Carboniferous. The Hatu-Baogutu metallogenic concentric region is characterized by considerable mantle-derived fluid,strong stress transform between extension and compression,complex tholeiite and calc-alkaline rock series,and multiple metallogeny. Metallogenic series occurred in the region includes quartz vein type and altered rock type gold deposit,porphyry Cu deposit and contemporaneous quartz vein and altered rock type gold deposit and hydrothermal vein type gold-copper deposits.