Nd isotopic characteristics of post-Archean sediments from the Eastern Nanling Range

Evidence for crustal evolution

Weizhou Shen*, Jinhai Yu, Lei Zhao, Zelin Chen, Hengcai Lin

*Corresponding author for this work

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

A systematic Sm-Nd isotopic study was carried out for sediments and metasediments of different ages from Mesoproterozoic to early Mesozoic era in southwestern Fujian, Eastern Nanling Range. The results show that Nd model age (tDM) and εNd(t) value of most sediments are closely similar to those of Paleoproterozoic Mayuan Group, indicating that they may mainly be the recycling product of Paleoproterozoic crustal materials. However, the Nd model age significantly decreases with a corresponding increase in the εNd(t) value at Neoproterozoic (ca. 0.8-0.7 Ga) and Late Paleozoic (ca. 0.25 Ga), respectively. This is manifested by prominent vales and apexes on the diagrams of tDM vs. tStr. (stratum age) and εNd(t) vs. tStr. The decrease in tDM and the increase in εNd(t) are explained as a result of the significant incorporation of juvenile crustal materials that originated from depleted mantle due to strong lithospheric extension during both periods. It appears that tectonic magmatism in the Neoproterozoic and the Late Paleozoic is of prominent importance in affecting the geochemical nature of sediments in South China.

Original languageEnglish
Pages (from-to)1679-1685
Number of pages7
JournalChinese Science Bulletin
Volume48
Issue number16
DOIs
Publication statusPublished - 2003
Externally publishedYes

Keywords

  • Eastern Nanling
  • Nd model age
  • Sediments and metasediments
  • Sm-Nd isotopes

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