Arid
DOI10.1016/j.epsl.2016.11.017
Short-lived increase in erosion during the African Humid Period: Evidence from the northern Kenya Rift
Garcin, Yannick1; Schildgen, Taylor F.1,2; Acosta, Veronica Torres1; Melnick, Daniel1,3; Guillemoteau, Julien1; Willenbring, Jane4; Strecker, Manfred R.1
通讯作者Garcin, Yannick
来源期刊EARTH AND PLANETARY SCIENCE LETTERS
ISSN0012-821X
EISSN1385-013X
出版年2017
卷号459页码:58-69
英文摘要

The African Humid Period (AHP) between similar to 15 and 5.5 cal. kyr BP caused major environmental change in East Africa, including filling of the Suguta Valley in the northern Kenya Rift with an extensive (similar to 2150 km(2)), deep (similar to 300 m) lake. Interfingering fluvio-lacustrine deposits of the Baragoi paleo-delta provide insights into the lake-level history and how erosion rates changed during this time, as revealed by delta-volume estimates and the concentration of cosmogenic Be-10 in fluvial sand. Erosion rates derived from delta-volume estimates range from 0.019 to 0.03 mm yr(-1). Be-10-derived paleo-erosion rates at similar to 11.8 cal. kyr BP ranged from 0.035 to 0.086 mm yr(-1), and were 2.7 to 6.6 times faster than at present. In contrast, at similar to 8.7 cal. kyr BP, erosion rates were only 1.8 times faster than at present. Because Be-10-derived erosion rates integrate over several millennia; we modeled the erosion-rate history that best explains the 10Be data using established non-linear equations that describe in situ cosmogenic isotope production and decay. Two models with different temporal constraints (15-6.7 and 12-6.7 kyr) suggest erosion rates that were 25 to 300 times higher than the initial erosion rate (pre-delta formation). That pulse of high erosion rates was short (similar to 4 kyr or less) and must have been followed by a rapid decrease in rates while climate remained humid to reach the modern Be-10-based erosion rate of,similar to 0.013 mm yr(-1). Our simulations also flag the two highest Be-10-derived erosion rates at 11.8 kyr BP related to nonuniform catchment erosion. These changes in erosion rates and processes during the AHP may reflect a strong increase in precipitation, runoff, and erosivity at the arid-to-humid transition either at 15 or similar to 12 cal. kyr BP, before the landscape stabilized again, possibly due to increased soil production and denser vegetation. (C) 2016 Elsevier B.V. All rights reserved.


英文关键词northern Kenya Rift Baragoi paleo-delta African Humid Period erosion Be-10
类型Article
语种英语
国家Germany ; Chile ; USA
收录类别SCI-E
WOS记录号WOS:000393006500006
WOS关键词COSMOGENIC NUCLIDES ; VEGETATION COVER ; DENUDATION RATES ; CLIMATE-CHANGE ; EAST-AFRICA ; HALF-LIFE ; SEDIMENT ; BE-10 ; BASIN ; SUGUTA
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/198324
作者单位1.Univ Potsdam, Inst Erd & Umweltwissensch, Karl Liebknecht Str 24,Haus 27, D-14476 Potsdam, Germany;
2.Helmholtz Zentrum Potsdam, Deutsch GeoForschungsZentrum GFZ, Telegrafenberg Potsdam, Germany;
3.Univ Austral Chile, Inst Ciencias Tierra, Casilla 567, Valdivia, Chile;
4.Univ Calif San Diego, Scripps Inst Oceanog, Earth Div, La Jolla, CA 92093 USA
推荐引用方式
GB/T 7714
Garcin, Yannick,Schildgen, Taylor F.,Acosta, Veronica Torres,et al. Short-lived increase in erosion during the African Humid Period: Evidence from the northern Kenya Rift[J],2017,459:58-69.
APA Garcin, Yannick.,Schildgen, Taylor F..,Acosta, Veronica Torres.,Melnick, Daniel.,Guillemoteau, Julien.,...&Strecker, Manfred R..(2017).Short-lived increase in erosion during the African Humid Period: Evidence from the northern Kenya Rift.EARTH AND PLANETARY SCIENCE LETTERS,459,58-69.
MLA Garcin, Yannick,et al."Short-lived increase in erosion during the African Humid Period: Evidence from the northern Kenya Rift".EARTH AND PLANETARY SCIENCE LETTERS 459(2017):58-69.
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