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Middle to late Pleistocene shift in eolian silts contribution into Mediterranean soils at the fringe of the Negev loess, Israel

Crouvi, Onn and Barzilai, Omry and Goldsmith, Yonaton and Amit, Rivka and Matskevich, Zinovi and Porat, Naomi and Enzel, Yehouda (2018) Middle to late Pleistocene shift in eolian silts contribution into Mediterranean soils at the fringe of the Negev loess, Israel. Quaternary Science Reviews, 191 . pp. 101-117. ISSN 0277-3791. https://resolver.caltech.edu/CaltechAUTHORS:20180529-103443692

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Abstract

A common spatial feature within loess deposits worldwide is a downwind decrease in thickness and grain size, trends that are powerful tools for reconstructing paleowinds and past atmospheric circulation. Although such trends have been identified, there is limited knowledge of similar trends farther downwind from the loess region, where eolian influx can influence soil formation and hydrological processes. To examine these impacts we studied Quaternary sequences in prehistoric sites in Jerusalem, located only ∼50 km downwind from the edge of the Negev loess. All sequences are composed of two units separated by an unconformity. The lower unit is of middle Pleistocene age, it is composed of unimodal clay to silty clay dust deposits with chert clasts and Lower-Middle Paleolithic artifacts. A non-deposition interval characterized the middle to late Pleistocene transition, when dust accumulation rates were low. The upper unit age is late Pleistocene to Holocene; it is composed of bimodal silty clay to silty clay loam. Quartz, K-feldspars, and plagioclase contents together with the location and amplitude of grain-size coarse mode increase up-sequence. The addition of coarse silts to the upper unit of the sequences was coeval with episodes of loess accretion in the Negev. These silts were generated most likely by eolian abrasion of sand grains in the upwind dunes. Similar to the Negev, the addition of silts resulted in burial of the drainage network and reduced runoff and soil erosion rates. We stress the importance of desert loess in determining soil composition and surficial hydrology in wetter areas located in adjacent downwind regions.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.quascirev.2018.04.030DOIArticle
ORCID:
AuthorORCID
Barzilai, Omry0000-0002-7564-392X
Goldsmith, Yonaton0000-0003-0398-9005
Porat, Naomi0000-0002-5900-2460
Enzel, Yehouda0000-0001-8367-9255
Additional Information:© 2018 Elsevier Ltd. Received 6 December 2017, Revised 11 April 2018, Accepted 27 April 2018, Available online 26 May 2018.
Subject Keywords:Loess; Dust; Soil; Desert; Mediterranean
Record Number:CaltechAUTHORS:20180529-103443692
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180529-103443692
Official Citation:Onn Crouvi, Omry Barzilai, Yonaton Goldsmith, Rivka Amit, Zinovi Matskevich, Naomi Porat, Yehouda Enzel, Middle to late Pleistocene shift in eolian silts contribution into Mediterranean soils at the fringe of the Negev loess, Israel, Quaternary Science Reviews, Volume 191, 1 July 2018, Pages 101-117, ISSN 0277-3791, https://doi.org/10.1016/j.quascirev.2018.04.030. (https://www.sciencedirect.com/science/article/pii/S0277379117310120)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:86657
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:29 May 2018 17:49
Last Modified:03 Oct 2019 19:46

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