湘南-桂东北地区寒武-奥陶纪沉积岩碎屑锆石U-Pb年代学特征及其地质意义

Translated title of the contribution: U-Pb geochronology of detrital zircons from the parametamorphic rocks of the Zhoutan Group, central Jiangxi Province

Xiao Lei Wang, Jin Hai Yu, Xujie Shu, Cheng Hu Tang, Guang Fu Xing

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

LA-ICP-MS zircon U-Pb dating work was carried out for the detrital zircons from the Zhoutan Group, central Jiangxi Province. Detrital zircons from three samples, including two garnet biotite schist and one biotite schist, show the youngest age peaks of 834 ± UMa, 830 ± HMa and 809 ± 15Ma, respectively. The age spectrum and maximum depositional ages of detrital zircons from the para-metamorphic rocks of the Zhoutan Group is similar to those for the Lengjiaxi Group and its equivalent sequences in the Jiangnan orogen, suggesting that the Zhoutan Group should have similar formation history, sources and tectonic settings with those sequences. Therefore, the Zhoutan Group, similar to the Shuangqiaoshan and Lengjiaxi groups, should have affinity with the Yangtze Block, rather than the Cathaysia Block, during the amalgamation between the two blocks. The metamorphic rims of the detrital zircons from the biotite schists yielded mean age of 444 ± 11 Ma and 438 ± 11 Ma, respectively. The metamorphic ages suggest that the metamorphism of the Zhoutan Group happened at Caledonian age, similar to other amphibolite-facies metamorphic rocks in the Cathaysia Block, but rather different from the coeval Shuangqiaoshan and Lengjiaxi groups along the Jiangnan orogen. It probably suggest that the rifting might have taken place at the central Jiangxi Province after the Neoproterozoic assembling between the Yangtze and Cathaysia blocks, which finally led to the different metamorphic process between the Zhoutan Group and the above two adjacent sequences (the Shuangqiaoshan and Lengjiaxi groups).

Original languageChinese
Pages (from-to)801-811
Number of pages11
JournalActa Petrologica Sinica
Volume29
Issue number3
Publication statusPublished - 2013
Externally publishedYes

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Keywords

  • Jiangnan orogen
  • Neoproterozoic
  • Para-metamorphic rocks
  • Zhoutan Group
  • Zircon U-Pb dating

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