Cosmogenic nuclide burial ages and provenance of Late Cenozoic deposits in the Sichuan Basin: Implications for Early Quaternary glaciations in east Tibet

Ping Kong*, Yong Zheng, Bihong Fu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

Collision between the Indian and the Eurasian plates since the early Cenozoic produces one of the world's most remarkable continental escarpments between the Tibetan Plateau and the adjacent Sichuan Basin. Yet Tertiary sediments are rare in the Sichuan Basin; the oldest preserved Late Cenozoic deposits called Dayi conglomerates directly overlie the Cretaceous or Jurassic red beds. Using cosmogenic 10Be and 26Al burial dating, we obtain deposition ages of ∼2.0 Ma and catchment erosion rates of ∼400 mm/ka for the Dayi conglomerates. Zircon U-Pb age distributions suggest derivation of these conglomerates from the Songpan-Ganzi flysch, the Pengguan complex and Late Permian and Triassic granite plutons in the headwater regions of the Min Jiang (Jiang, a Chinese term, means river). The formation of the poorly-sorted, sub-angular to sub-rounded and tens-centimeter-sized deposits in the western margin of the Sichuan Basin, after long distance transportation, is best explained by glacial activity ∼2.0 Ma ago in east Tibet.

Original languageEnglish
Pages (from-to)304-312
Number of pages9
JournalQuaternary Geochronology
Volume6
Issue number3-4
DOIs
Publication statusPublished - Jun 2011
Externally publishedYes

Keywords

  • Cosmogenic nuclide
  • Dayi conglomerate
  • Glaciations
  • Longmen Shan
  • Min Jiang
  • Zircon U-Pb age

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