Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.geomorph.2016.02.020 |
Controls on aggradation and incision in the NE Negev, Israel, since the middle Pleistocene | |
Matmon, A.1; Elfassi, S.1; Hidy, A.1,2; Geller, Y.1; Porat, N.3 | |
通讯作者 | Matmon, A. |
来源期刊 | GEOMORPHOLOGY |
ISSN | 0169-555X |
EISSN | 1872-695X |
出版年 | 2016 |
卷号 | 261页码:132-146 |
英文摘要 | We investigated the mid-Pleistocene to recent aggradation-incision pattern of two drainage systems (Nahal Peres and Nahal Tahmas) in the hyperarid north eastern Negev desert, southern Israel. Although these drainage systems drain into the tectonically active Dead Sea basin, lake level fluctuations cannot account for the aggradation-incision pattern as bedrock knickpoints disconnect the investigated parts of these drainage systems from base level influence. We applied geomorphic mapping, soil stratigraphy, optically stimulated luminescence (OSL) and costnogenic (in situ Be-10) exposure dating to reconstruct cycles of aggradation and incision of alluvial terraces and to study their temporal association with regional periods of humidity and aridity and global glacial interglacial cycles. The spatial and temporal relationships between the alluvial units suggest changes in the drainage system behavior since the middle Pleistocene, and show a pattern in which prolonged periods of sediment aggradation alternated with short periods of rapid and intense degradation through erosion and incision into sediment and bedrock. We obtain ages for several Pleistocene-Holocene periods of incision:similar to 1.1 Ma,similar to 300 ka, similar to 120 ka,similar to 20 ka,similar to 12 ka and similar to 2 ka. Although broadly synchronous, the Nahal Peres and Nahal Tahmas systems exhibit temporal differences in aggradation and incision. Hyperarid conditions have persisted in the region at least since the middle Pleistocene, as evidenced by gypsicsalic soils that ubiquitously cap the investigated alluvial terraces. This observation is consistent with other observations throughout the Negev indicating prolonged aridity. Thus, alternation between sediment aggradation and degradation cannot be correlated in a simple and straightforward way to climatic changes. We explain the temporal differences in aggradation and incision between Nahal Peres and Nahal Tahmas as resulting from the differences in stream gradient, basin hypsometry, and drainage basin area (which influences the amount of water passing through-the system). Regardless of humidity source (tropical plumes, Red Sea trough or Mediterranean fronts) and the frequency and intensity of rainfall in the region, our study shows that: 1) unlike other climatic proxies, such as speleothems, the evolution of alluvial terraces, which involves many stages (sediment generation, transport, deposition, and subsequent incision), results in a significant time gap between the actual ages of terraces and the timing of external triggers such as climatic fluctuations, and 2) such time-gaps may vary, even within nearby drainage systems, due to differences in drainage systems specific characteristics, and thus result in asynchronicity (or at least poor synchronicity) of alluvial terrace deposition and incision. (C) 2016 Elsevier B.V. All rights reserved. |
英文关键词 | Alluvial terraces Aggradation Incision Negev desert |
类型 | Article |
语种 | 英语 |
国家 | Israel ; USA ; France |
收录类别 | SCI-E |
WOS记录号 | WOS:000374624300010 |
WOS关键词 | PLUVIAL EPISODES ; EXPOSURE AGES ; DESERT ; RATES ; EVOLUTION ; EROSION ; RIFT ; LUMINESCENCE ; ESCARPMENT ; SEDIMENT |
WOS类目 | Geography, Physical ; Geosciences, Multidisciplinary |
WOS研究方向 | Physical Geography ; Geology |
来源机构 | French National Research Institute for Sustainable Development ; Hebrew University of Jerusalem |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/193247 |
作者单位 | 1.Hebrew Univ Jerusalem, Inst Earth Sci, IL-91904 Jerusalem, Israel; 2.Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, Livermore, CA 94550 USA; 3.Geol Survey Israel, 30 Malkhe Yisrael St, IL-95501 Jerusalem, Israel; 4.Aix Marseille Univ, CNRS, UMR CNRS 6635, CEREGE, BP 80, F-13545 Aix En Provence 4, France |
推荐引用方式 GB/T 7714 | Matmon, A.,Elfassi, S.,Hidy, A.,et al. Controls on aggradation and incision in the NE Negev, Israel, since the middle Pleistocene[J]. French National Research Institute for Sustainable Development, Hebrew University of Jerusalem,2016,261:132-146. |
APA | Matmon, A.,Elfassi, S.,Hidy, A.,Geller, Y.,&Porat, N..(2016).Controls on aggradation and incision in the NE Negev, Israel, since the middle Pleistocene.GEOMORPHOLOGY,261,132-146. |
MLA | Matmon, A.,et al."Controls on aggradation and incision in the NE Negev, Israel, since the middle Pleistocene".GEOMORPHOLOGY 261(2016):132-146. |
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