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塔里木板块东南缘多坝沟金矿区花岗岩类年代学、地球化学特征及找矿意义

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王玉玺, 第鹏飞, 陈万峰, 王金荣, 张渊, 沙鑫, 王怀涛. 塔里木板块东南缘多坝沟金矿区花岗岩类年代学、地球化学特征及找矿意义[J]. 西北地质, 2017, 50(1): 134-150.
引用本文: 王玉玺, 第鹏飞, 陈万峰, 王金荣, 张渊, 沙鑫, 王怀涛. 塔里木板块东南缘多坝沟金矿区花岗岩类年代学、地球化学特征及找矿意义[J]. 西北地质, 2017, 50(1): 134-150.
shu
WANG Yuxi, DI Pengfei, CHEN Wanfeng, WANG Jinrong, ZHANG Yuan, SHA Xin, WANG Huaitao. Geochemical Characteristics and Prospecting Significance of the Granites from the Duobagou Gold Deposit in the Southeast Tarim Basin[J]. Northwestern Geology, 2017, 50(1): 134-150.
Citation: WANG Yuxi, DI Pengfei, CHEN Wanfeng, WANG Jinrong, ZHANG Yuan, SHA Xin, WANG Huaitao. Geochemical Characteristics and Prospecting Significance of the Granites from the Duobagou Gold Deposit in the Southeast Tarim Basin[J]. Northwestern Geology, 2017, 50(1): 134-150.
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塔里木板块东南缘多坝沟金矿区花岗岩类年代学、地球化学特征及找矿意义

  • 1.

    兰州大学地质科学与矿产资源学院, 甘肃省西部矿产资源重点实验室(兰州大学), 甘肃 兰州 730000;甘肃省地质调查院, 甘肃 兰州 730000

  • 2.

    兰州大学地质科学与矿产资源学院, 甘肃省西部矿产资源重点实验室(兰州大学), 甘肃 兰州 730000;甘肃省矿产资源储量评审中心, 甘肃 兰州 730000

  • 3.

    兰州大学地质科学与矿产资源学院, 甘肃省西部矿产资源重点实验室(兰州大学), 甘肃 兰州 730000

  • 4.

    甘肃省地质调查院, 甘肃 兰州 730000

  • 基金项目: 中国地质调查局地质调查项目“中国矿产地质与成矿规律综合集成和服务（矿产地质志）”（DD2016036），甘肃省省级基础地质调查项目“甘肃省多坝沟地区1∶5万矿产远景调查”（20151616），甘肃省地质勘查基金项目“甘肃省阿克塞县多坝沟多金属矿普查”（20151306）

Geochemical Characteristics and Prospecting Significance of the Granites from the Duobagou Gold Deposit in the Southeast Tarim Basin

  • 1.

    School of Earth Sciences of Lanzhou University, Key Laboratory of Mineral Resources in Western China, Lanzhou 730000, Gansu, China;Geological Survey of Gansu Province, Lanzhou 730000, Gansu, China

  • 2.

    School of Earth Sciences of Lanzhou University, Key Laboratory of Mineral Resources in Western China, Lanzhou 730000, Gansu, China;Gansu Assessment Center of Mineral Resources Reserves, Lanzhou 730000, Gansu, China

  • 3.

    School of Earth Sciences of Lanzhou University, Key Laboratory of Mineral Resources in Western China, Lanzhou 730000, Gansu, China

  • 4.

    Geological Survey of Gansu Province, Lanzhou 730000, Gansu, China

    摘要
  • 多坝沟金矿是近年来塔里木盆地东南缘新发现的一处具有一定规模的金矿床，矿区内出露的英云闪长岩侵入闪长岩中，金矿体主要赋存在英云闪长岩体内部的构造蚀变带中。笔者对矿区闪长岩、英云闪长岩和金矿石进行了岩石学和地球化学研究，闪长岩具有埃达克型花岗岩特征，英云闪长岩具有喜马拉雅型花岗岩特征，全岩δ18OV-SMOW‰为11.0‰~13.4‰。通过金矿石的LA-ICP-MS锆石U-Pb测年，获得具有多期峰值的变质年龄，206Pb/238U年龄值在422~1 284 Ma，这组年龄显示出闪长岩形成年龄为（497±13）Ma，英云闪长岩的形成年龄为（435.9±6.6）Ma，伴随构造热液活动的年龄，成矿年龄稍晚于英云闪长岩的年龄，矿区的2期岩浆活动与塔里木东南缘-阿尔金北缘早古生代2期主要成矿阶段一致，多坝沟金矿成矿阶段主要集中在第二阶段，表明在塔里木盆地东南缘寻找与早古生代形成的埃达克型和喜马拉雅型花岗岩有关金铜矿床具有一定的潜力。
    The Duobagou gold deposithas been newly discovered in the southeastern margin of Tarim Basin witha certain scale, and the gold orebodies were mainly occurred in the tectonic alteration zone of tonalite that intrude into the diorite.In this paper, the petrological and geochemical features of diorite, tonalite and gold ore have been studied.The results show that the diorite has the properties of adakitic rocks, while the tonalite has the characteristics of the Himalayan type granite, and the δ18OV-SMOW values of whole rocks range from 11.0‰ to 13.4‰. The LA-ICP-MS zircon U-Pb dating for gold ore has revealed multiphase peak metamorphism age, the obtained 206Pb/238U ages vary from 422 Ma to 1284 Ma, suggesting that the diorite and tonalite were formed at (497±13)Ma and (435.9±6.6)Ma, respectively. Followed the age of the tectonic hydrothermal activity, the metallogenetic age is later than the formation age of tonalite. The ages of two-phases magma activities in this mining area are consistent with two main metallogenic stages of Southeast Tarim-North Alty in Early Paleozoic.The formation of Duobagou gold deposit had correlation with the second metallogenic stages, indicating that there is certainly potential to discover Au-Cu deposits related adakitic and Himalayan-type granites in Southeast Tarim Basin.
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收稿日期:  2016-11-12
修回日期:  2016-11-25
刊出日期:  2017-03-15

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