Quantifying passive margin denudation and landscape development using a combined fission-track thermochronology and cosmogenic isotope analysis approach

Details Quantifying passive margin denudation and landscape development using a combined fission-track thermochronology and cosmogenic isotope analysis approach Quantifying passive margin denudation and landscape development using a combined fission-track thermochronology and cosmogenic isotope analysis approach

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000e%26psl.179..429c&link_type=abstract

Earth and Planetary Science Letters, Volume 179, Issue 3-4, p. 429-435.

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21

Scientific paper

A new approach to empirically constraining numerical models of denudation and landscape development across passive continental margins is presented involving a combination of apatite fission-track thermochronology and cosmogenic isotope analysis. This integrated strategy is applied to the Namibian sector of the south-west African margin where the conventional landscape evolution model of inland retreat of an escarpment initiated at the coast at break-up implies a mean rate of retreat of ~1 km Ma-1. The thermochronological and cosmogenic isotope data are incompatible with a simple escarpment retreat model since they show that denudation rates oceanward of the present escarpment position have been low (<20 m Ma-1) since the end of the Eocene, and the estimated rate of escarpment retreat has been only ~10 m Ma-1. This low rate of retreat is, however, consistent with numerical landscape evolution models where the escarpment is pinned at an inland drainage divide.

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