气候变化领域集成服务门户(CCPortal): Patterns and rates of 103-105 yr denudation in carbonate terrains under subhumid to subalpine climatic gradient, Mount Hermon, Israel

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DOI	10.1130/B31973.1
	Patterns and rates of 103-105 yr denudation in carbonate terrains under subhumid to subalpine climatic gradient, Mount Hermon, Israel
	Avni S.; Joseph-Hai N.; Haviv I.; Matmon A.; Benedetti L.; Aumaître G.; Bourlès D.; Keddadouche K.
发表日期	2019
ISSN	167606
起始页码	899
结束页码	912
卷号	131 期号:2021-05-06
英文摘要	Despite the worldwide ubiquity of carbonate terrains, quantification and understanding of rates and patterns of carbonate erosion are still lacking. Carbonate landscapes are prone to chemical weathering (dissolution) and should therefore be strongly influenced by climatic variables such as precipitation. However, isolating the impact of these variables is difficult, as denudation rates are also influenced by tectonic processes and lithology. This study focused on deciphering 103-105 yr denudation patterns across Mount Hermon, Israel, exploiting its climatic gradient (1500-600 mm/yr) and homogeneous lithology (Jurassic limestone). The concentrations of in situ cosmogenic 36Cl in bedrock and sediment samples were utilized to characterize the spatial distribution of denudation and examine its potential drivers. Our results indicate differential denudation rates of Mount Hermon hilltops. The subalpine region (1700-2200 m, ~1300-1500 mm yr-1, mean annual temperature of 7 °C) yielded an average hilltop denudation rate of 19 ± 5 mm k.y.-1 (n = 5), while hilltops at intermediate altitudes (1000-1600 m, ~900-1200 mm yr-1) seem to erode faster at 42 ± 8 mm k.y.-1 (n = 7). In addition, soil cover seems to enhance denudation rates relative to bare bedrock conditions. This highlights a major difference between carbonates and silicates, where numerous silicates data sets suggest an exponential decrease in bedrock weathering and soil production as the soil thickness increases. Our new 36Cl results, in conjunction with previously measured average hilltop lowering rates within the subhumid Mediterranean climate across the Judean mountain range (500-600 mm yr-1, 19 ± 7 mm k.y.-1), suggest that optimum conditions for carbonate denudation and chemical weathering occur below the tree line, where soil is abundant, pCO2 is higher, and snow cover is scarce. This observation has intriguing implications in terms of long-term landscape evolution-an increase in the elevation of a mountain range above the tree line may provide negative feedback, which will decrease its hilltop erosion rate. © 2018 Geological Society of America.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184911
作者单位	Department of Geological and Environmental Sciences, Ben-Gurion University of the Negev, Beer-Sheva, 84105, Israel; The Fredy and Nadine Herrmann Institute of Earth Sciences, Admond J. Safra Campus, Givat Ram, Jerusalem, 91904, Israel; Aix-Marseille Université, Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Collège de France, UM 34 Centre de Recherche et d'Enseignement de Géosciences de l'Environnement (CEREGE), Technopôle de l'Arbois, BP80, Aix-en-Provence, 13545, France; Centre de Recherche et d'Enseignement de Géosciences de l'Environnement (CEREGE), Technopôle de l'Arbois, BP80, Aix-en-Provence, 13545, France
推荐引用方式 GB/T 7714	Avni S.,Joseph-Hai N.,Haviv I.,et al. Patterns and rates of 103-105 yr denudation in carbonate terrains under subhumid to subalpine climatic gradient, Mount Hermon, Israel[J],2019,131(2021-05-06).
APA	Avni S..,Joseph-Hai N..,Haviv I..,Matmon A..,Benedetti L..,...&Keddadouche K..(2019).Patterns and rates of 103-105 yr denudation in carbonate terrains under subhumid to subalpine climatic gradient, Mount Hermon, Israel.Bulletin of the Geological Society of America,131(2021-05-06).
MLA	Avni S.,et al."Patterns and rates of 103-105 yr denudation in carbonate terrains under subhumid to subalpine climatic gradient, Mount Hermon, Israel".Bulletin of the Geological Society of America 131.2021-05-06(2019).