华北东部橄榄岩岩石化学特征及其岩石圈地幔演化意义

Translated title of the contribution: Peridotitic petrochemistry of the eastern north China: Significance for lithospheric mantle evolution

Jian Ping Zheng*, Feng Xiang Lu, Chun Mei Yu, Xiao Ping Yuan, Rui Sheng Zhang

*Corresponding author for this work

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

A petrochemical analysis was undertaken of peridotitic xenoliths in volcanic rocks that erupted from the Paleozoic to the Cenozoic within the eastern part of the North China craton, and the peridotites as tectonic intrusive in the Early Mesozoic from the Sulu orogen. The results show that the cratonic mantle, which was refractory and existed when the kimberlites intruded in the Paleozoic, had almost been replaced by the newly accreted fertile lithospheric mantle during the Mesozoic-Cenozoic. The erosion, metasomatism and intermingling caused by the accreted asthenospheric material acting on the craton mantle along the weak zone and deep fault (such as the Tanlu fault) in the existing lithosphere resulted in the lithosphere thinning at a larger scale of 100 Ma ago (but later than 178 Ma). The largest thinning would be in the Eogene. The upwelling asthenospheric material transformed into accreted lithospheric mantle due to the asthenospheric temperature falling in the Neogene (leading to relatively slight lithospheric incrassation), and finally accomplished mantle replacement. The peridotitic body in the Sulu orogen represents the products spread from the modified cratonic lithospheric mantle.

Original languageChinese
Pages (from-to)49-56
Number of pages8
JournalDiqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences
Volume31
Issue number1
Publication statusPublished - Jan 2006
Externally publishedYes

Keywords

  • Eastern North China
  • Mantle replacement
  • Peridotite
  • Petrochemistry

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