Re-Os Isotopic Dating of Molybdenite Separated from the Bainaimiao Copper Deposit, Inner Mongolia and Its Geological Significance
详细信息
- 责任者：Zhao Yun (State Key Laboratory of Geological Processes and Mineral Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Wang Jianping
- 刊名：Earth Science Frontiers
- 出版年：2013
- 卷期：20(4)
- 关键词：铜矿 ; copper ores ; 铼—锇计时 ; Re-Os dating ; 内蒙古 ; Inner Mongolia
- 页码：p.361-368
- 图表：illus., 1 table, 26 refs.
- 分类号：1001
- issnNo：ISSN1005-2321
- isbnNo：CN11-3370/P
摘要
The Bainaimiao copper deposit of Inner Mongolia is located in the copper polymetallic belt of the Ondor Sum Caledonian accretion zone in Xing’an-Mongolia orogenic belt.The deposit is comprised of the northern and the southern ore belts.The host rock of the southern ore belt is greenschist,whereas the orebodies in the northern belt mainly occurred in the Caledonian granodiorite porphyry.Because of its complicated process of mineralization,the metallogenesis of this deposit is rather debatable and the study of this deposit is of great significance.The present paper is the first time to report accurate Re-Os isotopic data acquired from 7 crystals of molybdenite separated from this deposit.The Re-Os isotopic model age ranges from(439.6±6.4) Ma to(450.0±6.6) Ma and weighted average age is(446.5±3.5) Ma.The Re-Os isotope analysis also gives an isochronal age of(451.2±3.5) Ma and the MSWD is 1.3.Combined with the geological features of the deposit,it is concluded that the deposit is a porphyry copper deposit produced by island arc granodioritic porphyry on the basis of the primitive exhalative sedimentary mineralization under a subduction environment.Therefore,the metallogenesis of the deposit should belong to the multiple superimposed mineralizations.
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