Cosmogenic 10BE and 26AL studies of the rising star site, Cradle of Humankind, South Africa: mystery of the true denudation rates

Makhubela, Tebogo V., Kramers, J.D., Scherler, D., Wittmann, H., Dirks, P.H.G.M., and Winkler, S.R. (2017) Cosmogenic 10BE and 26AL studies of the rising star site, Cradle of Humankind, South Africa: mystery of the true denudation rates. In: Geological Society of America, Abstracts with programs (49). From: 129th Meeting of the Geological Society of America, 22-25 October 2017, Seattle, WA, USA.

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Abstract

Based on 10Be denudation rates previously found (3.6 m/Ma, [2]; 3.44 m/Ma, [1]), the landscape across the CoH is considered old and eroding slowly. High erosion rates similar to our results (5.13 - 15.02 m/Ma) for chert bedrock are ascribed to fast river incision or a recent partial collapse event [1,2]. In contrast, we think our high outcrop erosion rates reflect true denudation and low apparent values from soil samples indicate long retention of quartz on surface, while dolomite is largely removed in solution. The quartz then experiences periods of burial and reworking in caves and river terraces, resulting in low 26Al/10Be ratios.

Item ID: 52697
Item Type: Conference Item (Abstract / Summary)
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ISSN: 0016-7592
Date Deposited: 01 Mar 2018 02:08
FoR Codes: 04 EARTH SCIENCES > 0403 Geology > 040303 Geochronology @ 70%
04 EARTH SCIENCES > 0403 Geology > 040310 Sedimentology @ 30%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970104 Expanding Knowledge in the Earth Sciences @ 100%
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