Arid
DOI10.1016/j.epsl.2014.09.008
Styles and rates of long-term denudation in carbonate terrains under a Mediterranean to hyper-arid climatic gradient
Ryb, U.1; Matmon, A.1; Erel, Y.1; Haviv, I.2; Benedetti, L.3; Hidy, A. J.4
通讯作者Ryb, U.
来源期刊EARTH AND PLANETARY SCIENCE LETTERS
ISSN0012-821X
EISSN1385-013X
出版年2014
卷号406页码:142-152
英文摘要

Carbonate minerals, unlike silicates, have the potential to dissolve almost completely and with high efficiency. Thus, in carbonate terrains denudation rate and style (the governing process of denudation, mechanical or chemical) should be more sensitive to climatic forcing. Using Cl-36 measurements in 39 carbonate bedrock and sediment samples, we calculate long-term denudation rates across a sharp climatic gradient from Mediterranean to hyper-arid conditions. Our samples were collected along the Arugot watershed, which drains the eastern flank of the Judea Range (central Israel) to the Dead Sea and is characterized by a pronounced rain shadow. Denudation rates of flat-lying bedrock outcrops sampled along interfluves differ by an order of magnitude from similar to 20 mm ka(-1) in the Mediterranean zone to 1-3 mm ka(-1) in the hyper-arid zone. These rates are strongly correlated with precipitation, and thus reflect the importance of carbonate mineral dissolution in the overall denudation process. In contrast, denudation rates of steep bedrock surfaces depend on the hillslope gradient, but only in the hyper-arid climate zone, indicating that mechanical processes dominate the overall hillslope denudation within this zone. The dominance of slope-dependent mechanical erosion in the hyper-arid zone is also reflected by an increase in spatially-average denudation rates from 17-19 mm ka(-1) in the Mediterranean-semi-arid zones to 21-25 mm ka(-1) in the hyper-arid zone. These higher rates are attributed to clast contribution from steep slopes under arid climate. This suggests an increased importance of mechanical processes to the overall denudation in the hyper-arid zone.


We demonstrate that the transition between chemically-dominated denudation to mechanically-dominated denudation occurs between 100 and 200 mm of mean annual precipitation. Long-term denudation rates across the Judea Range indicate that between Mediterranean and hyper-arid climates, chemical weathering rates are limited by precipitation. Nevertheless, in more humid climates, chemical weathering rates are apparently limited by the rates of carbonate mineral dissolution. This study demonstrates that carbonate terrains have the capacity to shift between mechanically and chemically dominated denudation in response to changes in precipitation. Similar transitions in response to changes in temperature or the level of tectonic activity have been previously reported. We suggest that the abrupt nature of such transitions can be primarily attributed to the efficiency of carbonate dissolution processes and the competition between surface and subsurface drainage systems in carbonate terrains. (C) 2014 Elsevier B.V. All rights reserved.


英文关键词denudation chemical weathering erosion carbonate terrains climatic gradient Cl-36
类型Article
语种英语
国家Israel ; France ; USA
收录类别SCI-E
WOS记录号WOS:000344211200015
WOS关键词CHEMICAL-WEATHERING RATES ; SITU-PRODUCED BE-10 ; COSMOGENIC NUCLIDES ; EROSION RATES ; CL-36 ; LIMESTONE ; EVOLUTION ; BEDROCK ; SCALE ; ACCUMULATION
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
来源机构Ben-Gurion University of the Negev ; 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/2XILL650/181587
作者单位1.Fredy & Nadine Herrmann Inst Earth Sci, IL-91904 Jerusalem, Israel;
2.Ben Gurion Univ Negev, Dept Geol & Environm Sci, IL-84105 Beer Sheva, Israel;
3.Aix Marseille Univ, Ctr Rech & Enseignement Gosci Environm CEREGE, Inst Rech Dev, Coll France,Technopole Arbois,CNRS,UM 34, F-13545 Aix En Provence, France;
4.Lawrence Livermore Natl Lab, CAMS, Livermore, CA 94550 USA
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GB/T 7714
Ryb, U.,Matmon, A.,Erel, Y.,et al. Styles and rates of long-term denudation in carbonate terrains under a Mediterranean to hyper-arid climatic gradient[J]. Ben-Gurion University of the Negev, French National Research Institute for Sustainable Development,2014,406:142-152.
APA Ryb, U.,Matmon, A.,Erel, Y.,Haviv, I.,Benedetti, L.,&Hidy, A. J..(2014).Styles and rates of long-term denudation in carbonate terrains under a Mediterranean to hyper-arid climatic gradient.EARTH AND PLANETARY SCIENCE LETTERS,406,142-152.
MLA Ryb, U.,et al."Styles and rates of long-term denudation in carbonate terrains under a Mediterranean to hyper-arid climatic gradient".EARTH AND PLANETARY SCIENCE LETTERS 406(2014):142-152.
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