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现代地质 ›› 2014, Vol. 28 ›› Issue (3): 472-477.

• 岩石学与矿床学 • 上一篇    下一篇

内蒙古东乌旗莫合尔图石炭纪闪长岩的发现:来自锆石U-Pb年代学的证据

杨俊泉1,2 ,张素荣2 ,刘永顺2 ,程银行2 ,滕学建2,李艳锋2 ,彭丽娜2   

  1. (1中国地质大学(北京)地球科学与资源学院,北京100083;2天津地质矿产研究所,天津300170)
  • 出版日期:2014-06-12 发布日期:2014-06-15
  • 通讯作者: 张素荣,女,高级工程师,1981年出生,地球化学专业,主要从事基础地质的综合研究。
  • 作者简介:杨俊泉,男,助理研究员,博士研究生,1980年出生,矿物学、岩石学、矿床学专业,主要从事地质矿产调查工作。Email:dap-yangjunquan@163.com。
  • 基金资助:

    国土资源部地质大调查项目“内蒙古1∶5万敖包查干幅、多钦乌拉幅、宾巴勒查干幅、满都胡宝力格幅、1252高地幅区调”(1212010881218)。

Discovery of Carboniferous Diorite from Moheertu in Dongwuqi Area, Inner Mongolia: Evidence from Zircon U-Pb Geochronology

YANG Jun-quan1,2, ZHANG Su-rong2, LIU Yong-shun2, CHENG Yin-hang2, TENG Xue-jian2, LI Yan-feng2, PENG Li-na2   

  1. (1School of Earth Sciences and Resources, China University of Geosciences, Beijing100083,China; 2Tianjin Institute of Geology and Mineral Resources, Tianjin300170, China)
  • Online:2014-06-12 Published:2014-06-15

摘要:

大地构造位置隶属乌里雅思太活动大陆边缘的内蒙古东乌旗地区,是中亚造山带的重要组成部分,其内发育有大量的岩浆岩,侵入岩时代以二叠纪及晚中生代为主,鲜有早期岩体的报道。对该区莫合尔图一带的闪长岩进行锆石LA-MC-ICP-MS U-Pb同位素测定,结果显示,24个测点的年龄值比较集中,加权平均值为(337.1±1.9) Ma(MSWD=1.3),所测锆石具岩浆锆石的特征,表明岩体应形成于石炭纪。结合区域地质资料,认为东乌旗地区可能存在时限为337~310 Ma的构造-热事件。

关键词: 锆石U-Pb年龄, 石炭纪, 闪长岩, 东乌旗, 内蒙古, 中亚造山带

Abstract:

Dongwuqi area in Inner Mongolia, which lies in Uliastai active continental margin, is a part of Central Asian orogenic belt. Numerous magmatites are exposed in this area. The intrusive rocks mainly formed in Permian and Late Mesozoic, and seldom formed in the other period according to report. Diorite was discovered in Moheertu of this area during the 1∶50,000 regional geological surveys. By LA-MC-ICP-MS U-Pb isotopic dating for 24 zircons, weighted mean age of (337.1±1.9) Ma (MSWD=1.3) was obtained from the diorite. The characteristics of these zircons accord with magmatic zircon, and the results can represent the diagenetic age of diorite. Combined with regional geology, we concluded that a tectonothermal event occurred during 337-310 Ma in Dongwuqi area.

Key words: zircon U-Pb dating, Carboniferous, diorite, Dongwuqi, Inner Mongolia, Central Asian orogenic belt

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