Depositional Age, Provenance Characteristics and Tectonic Setting of the Ailaoshan Group in the Southwestern South China Block
作者:
作者单位:

作者简介:

通讯作者:

中图分类号:

基金项目:


Depositional Age, Provenance Characteristics and Tectonic Setting of the Ailaoshan Group in the Southwestern South China Block
Author:
Affiliation:

Fund Project:

The research was supported by the National Natural Science Foundation of China (Project No. 91855206, 41802072 and 41372069), the national key research and development plan (Project No. 2016YFC0600310), and China Postdoctoral Science Foundation (Project No. 2017M620853). We thank Profs. Qunke Xia and Chaohui Liu for their constructive comments.

  • 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:

    Abstract:

    The depositional and metamorphic ages and provenances of the Ailaoshan (ALS) Group in the Ailaoshan-Red River (ALS-RR) shear zone, southwestern South China Block (SCB), were investigated to constrain the tectonic history of the southwestern SCB. In this study, we use petrology, geochemical analysis, zircon cathodoluminescence imaging and U-Pb geochronology to analyse samples of quartzite, garnet-bearing two-mica schist and metapelite. The age spectra of detrital zircon grains from these metasediments show two dominant age peaks at 550–424 Ma and 876–730 Ma and two subordinate peaks at 970–955 Ma and ~2450 Ma. The youngest peak, corresponding to the early Palaeozoic, accounts for more than 20% of the total dates and constrains the deposition of the ALS Group to the Palaeozoic rather than the Palaeoproterozoic as traditionally thought. Moreover, two peaks of metamorphic ages corresponding to the Permo-Triassic and Cenozoic were also identified, and these ages document the tectonothermal events associated with the Indosinian collision between the Indochina Block and the SCB and the Himalayan collision between the Indian and Asian plates. Geochemical data suggest that the provenances of the ALS Group were dominated by continental arc and recycled metasedimentary rocks. The comparison of probability density distribution plots of the detrital zircon U-Pb age data indicates that the Neoproterozoic?detritus in the ALS Group was probably derived from the arc-related Neoproterozoic intrusive bodies in the northwestern and southwestern SCB. Furthermore, the early Palaeozoic detritus might have been sourced from eroded early Palaeozoic strata and magmatic plutons in Cathaysia and volcanic rocks in the western Indochina Block.

    参考文献
    相似文献
    引证文献
引用本文

JI Lei, LIU Fulai, WANG Fang, TIAN Zhonghua.2019. Depositional Age, Provenance Characteristics and Tectonic Setting of the Ailaoshan Group in the Southwestern South China Block[J]. ACTA GEOLOGICA SINICA(English edition),93(6):1687~1710

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:2019-02-25
  • 最后修改日期:2019-04-08
  • 录用日期:
  • 在线发布日期: 2019-12-24
  • 出版日期: