气候变化领域集成服务门户(CCPortal): Paleogene initiation of the Western Branch of the East African Rift: The uplift history of the Rwenzori Mountains, Western Uganda

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DOI	10.1016/j.epsl.2020.116593
	Paleogene initiation of the Western Branch of the East African Rift: The uplift history of the Rwenzori Mountains, Western Uganda
	Jess S.; Koehn D.; Fox M.; Enkelmann E.; Sachau T.; Aanyu K.
发表日期	2020
ISSN	0012821X
卷号	552
英文摘要	The two branches of the East African Rift System (EARS) are believed to have initiated diachronously. However, a growing body of work continues to suggest the onset of rifting in the Western Branch occurred in the Paleogene, coeval to the Eastern Branch. Due to a lack of pre-Miocene stratigraphy, attempts to resolve the geological history of the Western Branch must study the uplift and erosional histories of the modern rift topography. In this study, the rock uplift history of the Rwenzori Mountains, Western Uganda, is resolved to better our understanding of the tectonic history of the Western Branch of the EAR. Through the application of low-temperature thermochronology, χ-mapping and the modelling of river profiles, we show that rock uplift of the Rwenzori dates back to the Oligocene, with thermal history models suggesting uplift induced exhumation may date back as far as the Eocene. This provides tangible evidence that extension began in the region in the Paleogene, coeval with the Eastern Branch, and not the late Neogene. These results have broad implications for the tectonic evolution of the entire East African Rift System and suggest our current understanding of the region's rift history remains incomplete. © 2020 Elsevier B.V.
关键词	East African Rift rifting river profile thermochronology uplift Western Branch
英文关键词	Stratigraphy; Tectonics; Temperature; Topography; East African Rift; Geological history; Low temperatures; Tangible evidence; Tectonic evolution; Tectonic history; Thermal history; Thermochronology; Geologic models; Paleogene; rifting; stratigraphy; tectonic evolution; thermochronology; topography; uplift; East African Rift; Rwenzori Mountains; Uganda
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202676
作者单位	University of Calgary, Department of Geoscience, Calgary, AB T2N 1N4, Canada; Geo-Zentrum Nordbayern, University Erlangen-Nuremberg, Erlangen, Germany; Department of Earth Sciences, University College London, London, United Kingdom; Department of Geosciences, Eberhard Karls University Tübingen, Tübingen, Germany; Department of Geology and Petroleum Studies, College of Natural Sciences, Makerere University, P.O. Box 7062, Kampala, Uganda
推荐引用方式 GB/T 7714	Jess S.,Koehn D.,Fox M.,et al. Paleogene initiation of the Western Branch of the East African Rift: The uplift history of the Rwenzori Mountains, Western Uganda[J],2020,552.
APA	Jess S.,Koehn D.,Fox M.,Enkelmann E.,Sachau T.,&Aanyu K..(2020).Paleogene initiation of the Western Branch of the East African Rift: The uplift history of the Rwenzori Mountains, Western Uganda.Earth and Planetary Science Letters,552.
MLA	Jess S.,et al."Paleogene initiation of the Western Branch of the East African Rift: The uplift history of the Rwenzori Mountains, Western Uganda".Earth and Planetary Science Letters 552(2020).