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Denudation rates for the southern Drakensberg Escarpment, SE Africa, derived from in-situ-produced cosmogenic (super 36) Cl; initial results

A. Fleming, M. A. Summerfield, J. O. Stone, L. K. Fifield and R. G. Cresswell
Denudation rates for the southern Drakensberg Escarpment, SE Africa, derived from in-situ-produced cosmogenic (super 36) Cl; initial results
Journal of the Geological Society of London (March 1999) 156, Part 2: 209-212

Abstract

Cosmogenic (super 36) Cl concentrations in basalt samples from the Drakensberg escarpment on the SE African passive margin give quantitative estimates of denudation and scarp retreat rates. Over the 10 (super 4) -10 (super 6) year timespan addressed by these data, the calculated escarpment retreat rate has been 50-95 m Ma (super -1) and the average summit denudation rate 6 m Ma (super -1) . The scarp retreat rate is an order of magnitude less than previously suggested. The rate of summit lowering is sufficient to prevent the long-term intact survival of erosion cycle surfaces formed in the Mesozoic that were previously inferred for this region.


ISSN: 0016-7649
EISSN: 2041-479X
Coden: JGSLAS
Serial Title: Journal of the Geological Society of London
Serial Volume: 156, Part 2
Title: Denudation rates for the southern Drakensberg Escarpment, SE Africa, derived from in-situ-produced cosmogenic (super 36) Cl; initial results
Affiliation: University of Edinburgh, Department of Geography, Edinburgh, United Kingdom
Pages: 209-212
Published: 199903
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 23
Accession Number: 1999-030535
Categories: GeomorphologyIsotope geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: 1 table, sketch map
S30°40'00" - S28°34'60", E27°00'00" - E29°30'00"
Secondary Affiliation: Australian National University, AUS, Australia
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 199911
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