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Quantifying denudation rates on inselbergs in the central Namib Desert using in situ–produced cosmogenic 10Be and 26Al

1999; Geological Society of America; Volume: 27; Issue: 5 Linguagem: Inglês

10.1130/0091-7613(1999)027 2.3.co;2

1943-2682

H. A. P. Cockburn, Michele A. Seidl, M Summerfield,

Geochemistry and Geologic Mapping

Research Article| May 01, 1999 Quantifying denudation rates on inselbergs in the central Namib Desert using in situ–produced cosmogenic 10Be and 26Al Hermione A. P. Cockburn; Hermione A. P. Cockburn 1Department of Geography, University of Edinburgh, Drummond Street, Edinburgh EH8 9XP, UK Search for other works by this author on: GSW Google Scholar Michele A. Seidl; Michele A. Seidl 2Department of Geological Sciences, Rutgers University, New Brunswick, New Jersey 08903, USA Search for other works by this author on: GSW Google Scholar Michael A. Summerfield Michael A. Summerfield 1Department of Geography, University of Edinburgh, Drummond Street, Edinburgh EH8 9XP, UK Search for other works by this author on: GSW Google Scholar Author and Article Information Hermione A. P. Cockburn 1Department of Geography, University of Edinburgh, Drummond Street, Edinburgh EH8 9XP, UK Michele A. Seidl 2Department of Geological Sciences, Rutgers University, New Brunswick, New Jersey 08903, USA Michael A. Summerfield 1Department of Geography, University of Edinburgh, Drummond Street, Edinburgh EH8 9XP, UK Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1999) 27 (5): 399–402. https://doi.org/10.1130/0091-7613(1999)027 2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Hermione A. P. Cockburn, Michele A. Seidl, Michael A. Summerfield; Quantifying denudation rates on inselbergs in the central Namib Desert using in situ–produced cosmogenic 10Be and 26Al. Geology 1999;; 27 (5): 399–402. doi: https://doi.org/10.1130/0091-7613(1999)027 2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract In situ–produced cosmogenic isotope concentrations in bedrock surfaces provide valuable estimates of site-specific, long-term rates of denudation and provide constraints for numerical landscape-evolution models. Measurements of cosmogenic 10Be and 26Al from granite inselbergs in the arid to hyperarid central Namib Desert, Namibia, indicate a mean rate of summit lowering of 5.07 ± 1.1 m/m.y. over the past ≥ 105 yr. The persistence of an arid climate in the region suggests that a similar rate may have prevailed for the past ∼10 m.y. and possibly throughout much of the Cenozoic. Some samples have complex exposure histories that can be explained by the mode of inselberg weathering and mass wasting. The denudation rates estimated here are an order of magnitude higher than those reported for inselbergs in a significantly more humid environment in South Australia. This difference may largely be due to active salt weathering in the central Namib as a result of high levels of coastal fog precipitation. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.