干旱区生态环境知识资源中心(Arid): Climate control on Early Cenozoic denudation of. the Namibian margin as deduced from new thermochronological constraints

Arid

DOI	10.1016/j.epsl.2019.115779
	Climate control on Early Cenozoic denudation of. the Namibian margin as deduced from new thermochronological constraints
	Margirier, Audrey 1,2,3; Braun, Jean 1,2; Gautheron, Cecile 4; Carcaillet, Julien 5; Schwartz, Stephane 5; Jamme, Rosella Pinna 4; Stanley, Jessica 1
通讯作者	Margirier, Audrey
来源期刊	EARTH AND PLANETARY SCIENCE LETTERS
ISSN	0012-821X
EISSN	1385-013X
出版年	2019
卷号	527
英文摘要	The 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.
英文关键词	climate Early Eocene Climatic Optimum apatite (U-Th-Sm)/He thermochronology denudation weathering Namibian passive margin
类型	Article
语种	英语
国家	Germany ; USA ; France
收录类别	SCI-E
WOS记录号	WOS:000491609700006
WOS关键词	APATITE FISSION-TRACK ; ETENDEKA IGNEOUS PROVINCE ; SOUTH-AFRICA ; (U-TH)/HE THERMOCHRONOMETRY ; AR-40/AR-39 GEOCHRONOLOGY ; CONTINENTAL-MARGIN ; RADIATION-DAMAGE ; ATLANTIC MARGIN ; UPLIFT HISTORY ; EVOLUTION
WOS类目	Geochemistry & Geophysics
WOS研究方向	Geochemistry & Geophysics
EI主题词	2019-12-01
来源机构	University of Arizona ; French National Research Institute for Sustainable Development
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/311352
作者单位	1.GFZ German Res Ctr Geosci, Helmholtz Ctr Potsdam, Telegrafenberg Bldg A27, D-14473 Potsdam, Germany; 2.Univ Potsdam, Inst Erd & Umweltwissensch, D-14476 Potsdam, Germany; 3.Univ Arizona, Dept Geosci, 1040 East 4th St, Tucson, AZ 85721 USA; 4.Univ Paris Saclay, Univ Paris Sud, GEOPS, CNRS, F-91405 Orsay, France; 5.Univ Savoie Mt Blanc, Univ Grenoble Alpes, ISTerre, CNRS,IRD,IFSTTAR, F-38000 Grenoble, France
推荐引用方式 GB/T 7714	Margirier, Audrey,Braun, Jean,Gautheron, Cecile,et al. Climate control on Early Cenozoic denudation of. the Namibian margin as deduced from new thermochronological constraints[J]. University of Arizona, French National Research Institute for Sustainable Development,2019,527.
APA	Margirier, Audrey.,Braun, Jean.,Gautheron, Cecile.,Carcaillet, Julien.,Schwartz, Stephane.,...&Stanley, Jessica.(2019).Climate control on Early Cenozoic denudation of. the Namibian margin as deduced from new thermochronological constraints.EARTH AND PLANETARY SCIENCE LETTERS,527.
MLA	Margirier, Audrey,et al."Climate control on Early Cenozoic denudation of. the Namibian margin as deduced from new thermochronological constraints".EARTH AND PLANETARY SCIENCE LETTERS 527(2019).