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dc.contributor.authorMargirier, Audrey
dc.contributor.authorBraun, Jean
dc.contributor.authorGautheron, Cecile
dc.contributor.authorCarcaillet, Julien
dc.contributor.authorSchwartz, Stephane
dc.contributor.authorJamme, Rosella Pinna
dc.contributor.authorStanley, Jessica
dc.date.accessioned2019-12-05T23:00:38Z
dc.date.available2019-12-05T23:00:38Z
dc.date.issued2019-09-10
dc.identifier.citationMargirier, A., Braun, J., Gautheron, C., Carcaillet, J., Schwartz, S., Jamme, R. P., & Stanley, J. (2019). Climate control on Early Cenozoic denudation of the Namibian margin as deduced from new thermochronological constraints. Earth and Planetary Science Letters, 527, 115779.en_US
dc.identifier.issn0012-821X
dc.identifier.doi10.1016/j.epsl.2019.115779
dc.identifier.urihttp://hdl.handle.net/10150/636273
dc.description.abstractThe processes that control long term landscape evolution in continental interiors and, in particular, along passive margins such as in southern Africa, are still the subject of much debate (e.g. Braun, 2018). Although today the Namibian margin is characterized by an arid climate, it has experienced climatic fluctuations during the Cenozoic and, yet, to date no study has documented the potential role of climate on its erosion history. In western Namibia, the Brandberg Massif, an erosional remnant or inselberg, provides a good opportunity to document the Cenozoic denudation history of the margin using the relationship between rock cooling or exhumation ages and their elevation. Here we provide new apatite (UThSm)/He dates on the Brandberg Inselberg that range from 151 +/- 12 to 30 +/- 2 Ma. Combined with existing apatite fission track data, they yield new constraints on the denudation history of the margin. These data document two main cooling phases since continental break-up 130 Myr ago, a rapid one (similar to 10 degrees C/Myr) following break-up and a slower one (similar to 12 degrees C/Myr) between 65 and 35 Ma. We interpret them respectively to be related to escarpment erosion following rifting and continental break-up and as a phase of enhanced denudation during the Early Eocene Climatic Optimum. We propose that during the Early Eocene Climatic Optimum chemical weathering was important and contributed significantly to the denudation of the Namibian margin and the formation of a pediplain around the Brandberg and enhanced valley incision within the massif. Additionally, aridification of the region since 35 Ma has resulted in negligible denudation rates since that time. (C) 2019 Elsevier B.V. All rights reserved.en_US
dc.description.sponsorshipHeDiff project [ANR-12-BS06-0005]en_US
dc.language.isoenen_US
dc.publisherELSEVIERen_US
dc.rightsCopyright © 2019 Elsevier B.V. All rights reserved.en_US
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectclimateen_US
dc.subjectEarly Eocene Climatic Optimumen_US
dc.subjectapatite (U-Th-Sm)/He thermochronologyen_US
dc.subjectdenudationen_US
dc.subjectweatheringen_US
dc.subjectNamibian passive marginen_US
dc.titleClimate control on Early Cenozoic denudation of the Namibian margin as deduced from new thermochronological constraintsen_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizona, Dept Geoscien_US
dc.identifier.journalEARTH AND PLANETARY SCIENCE LETTERSen_US
dc.description.note24 month embargo; published online: 10 September 2019en_US
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en_US
dc.eprint.versionFinal accepted manuscripten_US


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