西昌昔格达组物质组成及源区分析

Translated title of the contribution: Geochemical characteristics of Xigeda lacustrine sediments, underlying fluvial gravels and its constraints on provenance related to Xigeda paleo-lake in Panzhihua area, Sichuan Province

Yong Zheng*, Yajun Wang, Ping Kong

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Lacustrine sediments and underlying fluvial gravels related with Xigeda paleo-lake outcrop in the Panzhihua area, west of Yangtze platform. High concentrations of SiO2 and high SiO2/ A12O 3 ratios with the lacustrine sediments suggest high maturity and long distance transportation. The geochemical characteristics of major, REE and trace elements allocate the provenance of lacustrine sediments to a continental island-arc environment, and most probably derived from the granitoid region of Yidun island arc in the Songpan-Ganze orogenic belt. Eu/La-Yb/La signatures and Zr/Y ratios provide further information on the provenance of the lacustrine sediments, from both catchments of the Jinsha River and the Yalong River. This suggests that the upstream of Jinsha River was captured during the period of Xigeda paleo-lake formation. The geochemical characteristics of REE and trace elements in the fluvial gravels underlying Xigeda lacustrine sediments suggest formation in a tectonic setting of passive continental margin, and most probably in the west part of Yangtze platform, in the catchment of Yalong River. The different provenance features between the lacustrine sediments and the underlying fluvial gravels imply a significant change of the course of the Jingsha River in the period of Xigeda paleo-lake formation.

Original languageChinese
Pages (from-to)1036-1051
Number of pages16
JournalScientia Geologica Sinica
Volume44
Issue number3
Publication statusPublished - 2009
Externally publishedYes

Keywords

  • Fluvial gravel
  • Jinsha River
  • Panzhihua
  • Provenance
  • Xigeda formation

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    Zheng, Y., Wang, Y., & Kong, P. (2009). 西昌昔格达组物质组成及源区分析. Scientia Geologica Sinica, 44(3), 1036-1051.