东昆仑祁漫塔格地区野马泉深部的华力西期花岗闪长岩U-Pb年龄及其意义

野马泉大型矿床是近年来在东昆仑祁漫塔格地区发现的与侵入岩有关的矽卡岩型铁铜多金属矿。利用锆石LA-ICP-MS U-Pb法测得野马泉花岗闪长岩的形成年龄为(392.4±2.2) Ma，属于华力西期。前人利用辉钼矿Re-Os法，获得矽卡岩型铜钼多金属矿石和矽卡岩型钼矿石的等时线年龄分别为(225.0±4.0) Ma(n=7，MSWD=0.24)和(230.1±4.7) Ma(n=5，MSWD=0.12)、在多期热液叠加、多期成矿作用中，早期成矿的热液很可能是野马泉花岗闪长岩(392.4±2.2 Ma)提供的。由于该区有较多的中酸性岩体存在，它们可能为铁铜多金属矿的主要来源，因此确定这些侵入体的形成年龄，对于在该区寻找矽卡岩型铁铜多金属矿具有重要的理论和实践意义。

U-Pb Age of Yemaquan Deep Variscan Granodiorite in Qimantage Area,Eastern Kunlun and Its Significance

Yemaquan large-scale deposit, found in recent years in the Qimantage area, Eastern Kunlun, is related to intrusive rock and is skarn type iron copper polymetallic deposit. Using zircon LA-ICP-MS U-Pb method, the authors measured the Yemaquan granodiorite formation age for (392.4±2.2) Ma, which belongs to the Variscan Stage. Previous use of molybdenite Re-Os method obtained isochron age of skarn type copper-molybdenum polymetallic ores and skarn type molybdenum ores which are (225.0±4.0) Ma (n=7,MSWD=0.24) and (230.1±4.7) Ma (n=5, MSWD=0.12). In the stage of hydrothermal superimposition, in mineralization periods, early metallogenic hydrothermal is likely to be provided by Yemaquan granodiorite (392.4±2.2 Ma). Since there are much acidic rocks in this area, the intermediate-acid rock mass may be the main source for iron-copper polymetallic deposit; therefore, the intrusive body formation age, in the search for skarn type iron-copper polymetallic deposit, not only has important theoretical significance, but also has important practical significance.