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Publication Detail
Erosion rates in the source region of an ancient sediment routing system: Comparison of depositional volumes with thermochronometric estimates
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Journal Article
  • Authors:
    Michael NA, Carter A, Whittaker AC, Allen PA
  • Publication date:
  • Pagination:
    401, 412
  • Journal:
    Journal of the Geological Society
  • Volume:
  • Issue:
  • Status:
  • Print ISSN:
Calculation of the total depositional volume of an ancient source-to-sink system, combined with estimates of the area of catchments acting as source regions using provenance methods, is used to evaluate average catchment erosion rates on a million year time scale. These rates are compared with values derived from thermochronological methods. Using the mid- to late Eocene (33.9-41.6 Ma) Escanilla palaeo-sediment routing system from the south-central Pyrenean orogenic wedge-top zone as an example, c. 3500 ± 300 km3 of solid particulate sediment was derived from two catchments in the south-central Pyrenees over a 7.7 myr period, equivalent to a mean erosion rate of c. 0.15-0.18 mm a-1. Average exhumation rates in contributing catchments over the same time interval are estimated at 0.2-0.3 mm a-1 based on apatite fission-track analysis of pebbles in proximal conglomerates, and 0.23-0.34 mm a-1 from fission-track analysis of detrital apatites sampling a wider range of grain size. Sediment supply progressively increased during the mid- to late Eocene time period, at least in part driven by catchment expansion deep into the Pyrenean Axial Zone at c. 39 Ma. The consistency of the rates of catchment-averaged erosion calculated from different methods builds confidence that source areas have been connected to depositional sinks correctly. © 2014 The Geological Society of London.
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