Dating the incision of the Yangtze River gorge at the First Bend using three-nuclide burial ages

Devin McPhillips, Gregory D. Hoke, Jing Liu-Zeng, Paul R. Bierman, Dylan H. Rood, Samuel Niedermann

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

Incision of the Yangtze River gorge is widely interpreted as evidence for lower crustal flow beneath the southeast margin of the Tibetan Plateau. Previous work focused on the onset of incision, but the duration of incision remains unknown. Here we present cosmogenic nuclide burial ages of sediments collected from caves on the walls of the gorge that show the gorge was incised ~1 km sometime between 18 and 9 Ma. Thereafter, incision slowed substantially. We resolve middle Miocene burial ages by using three nuclides and accounting for in situ muogenic production. This approach explains the absolute concentrations of 10Be, 26Al, and 21Ne, as well as 26Al/10Be and 21Ne/10Be ratios. A declining incision rate challenges existing geodynamic interpretations by suggesting that either (1) surface uplift has ceased immediately south of the plateau margin or (2) gorge incision is not a useful proxy for the timing of surface uplift.

Original languageEnglish (US)
Pages (from-to)101-110
Number of pages10
JournalGeophysical Research Letters
Volume43
Issue number1
DOIs
StatePublished - Jan 16 2016

Keywords

  • Tibetan Plateau
  • Yangtze River
  • burial dating
  • cosmogenic nuclide
  • river incision

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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