地学前缘 ›› 2010, Vol. 17 ›› Issue (2): 178-184.

• 论文 • 上一篇    下一篇

再论内蒙古阿拉善朱拉扎嘎金矿的成矿时代:来自锆石SHRIMP U-Pb年龄的新证据

李俊建, 翟裕生, 杨永强, 王彦斌, 李承东, 崔来旺, 周红英, 刘晓阳, 刘晓雪, 李生   

  1. 1中国地质大学(北京) 地质过程与矿产资源国家重点实验室, 北京 100083
    2中国地质调查局 天津地质调查中心, 天津 300170
    3中国地质科学院 北京离子探针中心, 北京 100037
    4内蒙古自治区地质调查院, 内蒙古 呼和浩特 010020
  • 收稿日期:2010-01-10 修回日期:2010-01-30 出版日期:2010-03-15 发布日期:2010-04-05
  • 作者简介:李俊建(1962—),男,博士,研究员,主要从事区域成矿学研究与矿产勘查工作。E-mail: junjianl@163.com
  • 基金资助:

    中国地质大学(北京)地质过程与矿产资源国家重点实验室资助课题(200630,200624);中国地质调查局地质大调查项目(200110200038,1212010781028,1212010811061);科学技术部专项资金项目(200811010)

Re-discussion on the metallogenic age of Zhulazaga gold deposit in Alashan Area, Inner Mongolia: Evidence from zircon U-Pb SHRIMP age.

LI  Dun-Jian, DI  Yu-Sheng, YANG  Yong-Jiang, WANG  Pan-Bin, LI  Cheng-Dong, CUI  Lai-Wang, ZHOU  Gong-Yang, LIU  Xiao-Yang, LIU  Xiao-Xue, LI  Sheng   

  1. 1State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences(Beijing), Beijing 100083, China
    2Tianjin Center, China Geological Survey, Tianjin 300170, China
    3Beijing SHRIMP Center,  Chinese Academy of Geological Sciences, Beijing 100037, China
    4Institute of Geological Survey of Inner Mongolia Autonomous Region, Huhhot  010020, China
  • Received:2010-01-10 Revised:2010-01-30 Online:2010-03-15 Published:2010-04-05

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摘要：

内蒙古阿拉善地区朱拉扎嘎金矿是新近发现的特大型层控改造型金矿床,该矿床以产于中元古界地层中和巨大的找矿潜力而引人注目。容矿岩石主要为钙质粉砂岩、粉砂质板岩。曾采用颗粒锆石U-Pb法和40Ar/39Ar法对成矿期花岗斑岩、成矿后期闪长玢岩和含金石英硫化物矿体进行了年龄测定,获得成矿期花岗斑岩锆石U-Pb年龄为(304±5) Ma,成矿后期闪长玢岩为(2586±57) Ma,金矿体中石英的40Ar/39Ar年龄为(282.3±0.9) Ma。现采用SHRIMP锆石UPb法对成矿期花岗斑岩和成矿后期闪长玢岩进行了重新测年,结果表明花岗斑岩的形成时代为(280±6) Ma,闪长玢岩的形成时代为(279.7±5.2) Ma,两者的年龄差仅0.3 Ma,从而限定了朱拉扎嘎金矿的形成年龄,非常接近于280 Ma(279.7~280 Ma)。

关键词: 花岗斑岩, 闪长玢岩, 锆石SHRIMP UPb年龄, 朱拉扎嘎金矿

Abstract:

Zhulazaga gold deposit is a super large strataboundreconstructive gold  deposit that has been found in recent years in Alashan area, Inner Mongolia. The gold deposit occurs in Mesoproterozoic strata and has great ore prospecting potential; so many people are interested in it. The host rocks mainly are calcareous siltstone and silty slate. Single zircon UPb and quartz 40Ar/39Ar methods are applied to determining the UPb ages of metallogenic periods graniteporphyry and postmetallogenic periods dioriteporphyrite, and the 40Ar/39Ar age of Aubearing quartzsulfide ore body in 2006. The measurements on the zircons showed (304±5) Ma from the metallogenic periods graniteporphyry and (2586±57) Ma from the postmetallogenic periods dioriteporphyrite. The measurement on the quartz from the Aubearing quartzsulfide ore body showed (2823±0.9) Ma. Zircon SHRIMP UPb dating of graniteporphyry and dioriteporphyrite in this study showed that the metallogenic periods graniteporphyry has an emplacement age of (280±6) Ma,and the postmetallogenic periods dioriteporphyrite has an emplacement age of (279.7±5.2) Ma. The time difference between the ages of graniteporphyry and dioriteporphyrite is only 0.3 Ma,thus providing a precise metallogenic age of Zhulazaga gold deposit close to 280 Ma(279.7280 Ma).

Key words: graniteporphyry, dioriteporphyrite, zircon SHRIMP UPb age, Zhulazaga gold deposit

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