Reconciling tectonic shortening, sedimentation and spatial patterns of erosion from 10Be paleo-erosion rates in the Argentine Precordillera

Pedro Val, Gregory Dean Hoke, Julie C. Fosdick, Hella Wittmann

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

The temporal evolution of erosion over million-year timescales is key to understand the development of mountain ranges and adjacent fold-and-thrust belts. While models of orogenic wedge dynamics predict an instantaneous response of erosion to pulses of rock uplift, stream-power based models predict that catchment-wide erosion maxima significantly lag behind a pulse of rock uplift. Here, we explore the relationships between rock uplift, erosion, and sediment deposition in the Argentine Precordillera fold-and-thrust belt at 30°S. Using a combination of 10Be-derived paleo-erosion rates, constraints on re-exposure using 26Al/10Be ratios, geomorphic observations and detrital zircon provenance, we demonstrate that the attainment of maximum upland erosion rates lags the maximum rate of deformation over million-year timescales. The magnitudes and causes of the erosional delays shed new light on the catchment erosional response to tectonic deformation and rock uplift in orogenic wedges.

Original languageEnglish (US)
Pages (from-to)173-185
Number of pages13
JournalEarth and Planetary Science Letters
Volume450
DOIs
StatePublished - Sep 15 2016

Keywords

  • Be paleo-erosion rates
  • Andes
  • compressional mountain range
  • detrital zircon provenance
  • rock uplift
  • time-lag

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

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