大别造山带早白垩世基性岩的同位素特征及下地壳物质对岩浆源区的贡献

Translated title of the contribution: The isotopic characteristics of the Early-Cretaceous mafic rocks from Dabie Orogenic Belt and the contribution of the lower crust to the magma source

Quan Zhong Li*, Zhi Xie, Xi Sheng Xu, Jiang Feng Chen, Tian Shan Gao

*Corresponding author for this work

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Studies on Sr-Nd isotopic ratios and element compositions for the mafic rocks from Jiaoziyan plutons and Pb isotopic ratios for the mafic rocks from Jiaoziyan and Shacun plutons show that(87Sr/86 Sr)i = 0.7072 - 0.7075, εNd(t) = - 10.4- - 11.9, (206Pb/204Pb)i = 16.464 - 17.394, (207Pb/204Pb)i = 15.349 - 15.453, (208Pb/204Pb)i = 37.338 - 37.976. These isotopic compositions imply that the contribution of the lower crust to the mantle source is very important; especially that Pb isotope composition indicates that the contribution come from Dabie lower crust itself. The mechanism of addition of the lower crustal material into the mantle maybe relate to delamination.

Original languageChinese
Pages (from-to)1771-1781
Number of pages11
JournalActa Petrologica Sinica
Volume24
Issue number8
Publication statusPublished - 2008
Externally publishedYes

Keywords

  • Early-Cretaceous
  • Lower crust
  • Mafic rocks
  • North Dabie
  • Pb-Sr-Nd isotope

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