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现代地质 ›› 2014, Vol. 28 ›› Issue (6): 1161-1169.

• 岩石学与地球化学 • 上一篇    下一篇

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

宋忠宝1,张雨莲1,贾群子1,陈向阳1,江磊1,李东生2,何书跃2,李金超1,杨涛1,全守村1,栗亚芝1,张晓飞1   

  1. (1.西安地质矿产研究所,陕西 西安710054;2.青海省第三地质矿产勘查院,青海 西宁810012)
  • 出版日期:2014-12-27 发布日期:2015-01-30
  • 作者简介:宋忠宝,男,研究员,1963年出生,构造学专业,主要从事青藏高原地区岩石矿产及同位素地质年代学研究。 Email:szhongbao@163.com。
  • 基金资助:

    中国地质调查局地质大调查项目“青海省地质调查综合研究”(1212010918044);中国地质调查局地质大调查项目“青海省岩浆岩时空分布与成矿作用研究”(1212011121089)。

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

SONG Zhong-bao1, ZHANG Yu-lian1, JIA Qun-zi1, CHEN Xiang-yang1, JIANG Lei1, LI Dong-sheng2, HE Shu-yue2, LI Jin-chao1, YANG Tao1, QUAN Shou-cun1, LI Ya-zhi1, ZHANG Xiao-fei1   

  1. (1.Xi’an Institute of Geology and Mineral Resources, Xi’an, Shaanxi710054, China;
    2.The Third Geological and Mineral Exploration Academy of Qinghai Province, Xining, Qinghai810012, China)
  • Online:2014-12-27 Published:2015-01-30

摘要:

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。

关键词: 花岗闪长岩, 成岩时代, 铁铜矿床, 野马泉, 祁漫塔格, 东昆仑

Abstract:

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.

Key words: granodiorite, diagenetic age, Fe-Cu deposit, Yemaquan, Qimantage, Eastern Kunlun

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