内蒙古狼山巴音前达门地区黑云斜长片麻岩年代学研究及板块归属
DOI:
作者:
作者单位:

天津地质矿产研究所

作者简介:

通讯作者:

中图分类号:

基金项目:

国家青年自然科学基金项目(编号40902021)


Chronology and Plate Attribution of Biotite Plagiogneiss in Bayinqiandamen Area, Langshan, Inner Mongolia
Author:
Affiliation:

Tianjin Institute of Geology and Mineral Resources

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    内蒙古西部狼山地区的构造归属争议较大,一直以来没有直接证据证明狼山地区属于华北陆块。本文对内蒙古狼山巴音前达门地区(含石榴子石)黑云斜长片麻岩进行了年代学研究,利用LA- ICP- MS方法进行U- Pb同位素测年,所测试锆石均为岩浆锆石,锆石年龄为1946±9 Ma和1940±12 Ma,代表其原岩的形成年龄,说明狼山地区存在古元古代晚期岩浆作用。从锆石Hf同位素来看,εHf(t) 从-1.3~6.4,其Hf同位素源区既有当时华北克拉通基底物质,又有地幔的贡献,2442Ma的模式年龄指示源岩来源于早元古代地壳增生事件,可能与华北克拉通基底的形成有关。这进一步表明狼山地区同华北陆块中部地区一样,该地区存在有早元古代岩体。对宝音图群碎屑锆石的研究同样说明了狼山地区宝音图群与华北克拉通更具亲缘性,狼山地区在构造属性上可能属于华北陆块一部分。

    Abstract:

    Different perspectives exist in the structural attribution of Langshan, western Inner Mongolia.No direct evidence pointing this region belonged to North China Craton has been found. In this paper, detailed chronology study is applied to Biotite Plagiogneiss (garnet- contain) from Bayinqiandamen, Langshan, Inner Mongolia. According to the result derived from LA- ICP- MS U- Pb isotope dating, all samples were magmatic zircon, 1946±9Ma and 1918±11Ma indicating the crystallization age of protolith. This result proved magmatism occurred in Langshan in the late stage of Paleoproterozoic era. According zircon Hf isotope, epsilon Hf(t) ranges from -1.3 to 6.4.The Hf isotope source area contains both North China Craton’s basement material and contribution from mantle. The model age of 2442Ma indicates that the source rock originated from the early Proterozoic crustal accretion event, which may be related to the formation of North China craton basement. Therefore, similar to central North China Craton, this region also contained Magmatic from early Proterozoic. The study of detrital zircon in Baoyintu Group as well implied the affinity between Baoyintu Group in Langshan and North China Craton, suggesting Langshan structure should belong to North China Craton.

    参考文献
    相似文献
    引证文献
引用本文

初航,王惠初,魏春景,常青松,相振群,张晋瑞.2018.内蒙古狼山巴音前达门地区黑云斜长片麻岩年代学研究及板块归属[J].地质学报,92(12):2410-2419.
CHU Hang, WANG Huichu, WEI Chunjing, CHANG Qingsong, XIANG Zhenqun, ZHANG Jinrui.2018. Chronology and Plate Attribution of Biotite Plagiogneiss in Bayinqiandamen Area, Langshan, Inner Mongolia[J]. Acta Geologica Sinica,92(12):2410-2419.

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2015-07-15
  • 最后修改日期:2018-04-24
  • 录用日期:2018-05-01
  • 在线发布日期: 2018-12-19
  • 出版日期: