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Late Quaternary weathering, erosion, and deposition in Nahal Yael, Israel: An "impact of climatic change on an arid watershed"?

2012; Geological Society of America; Volume: 124; Issue: 5-6 Linguagem: Inglês

10.1130/b30538.1

1943-2674

Yehouda Enzel, Rivka Amit, Tamir Grodek, Avner Ayalon, Judith Lekach, Naomi Porat, Paul R. Bierman, Joel D. Blum, Yigal Erel,

Isotope Analysis in Ecology

Research Article| May 01, 2012 Late Quaternary weathering, erosion, and deposition in Nahal Yael, Israel: An "impact of climatic change on an arid watershed"1? Yehouda Enzel; Yehouda Enzel † 1The Fredy and Nadine Herrmann Institute of Earth Sciences, The Hebrew University of Jerusalem, Edmond J. Safra Campus, GivatRam, Jerusalem 91904, Israel †E-mails: yenzel@huji.ac.il; rivka@gsi.gov.il; t.grodek@gmail.com; judith@vms.huji.ac.il; naomi.porat@gsi.gov.il; pbierman@uvm.edu; jdblum@umich.edu; yerel@vms.huji.ac.il. Search for other works by this author on: GSW Google Scholar Rivka Amit; Rivka Amit † 2Geological Survey of Israel, 30 Malkhe Israel Street, Jerusalem 95501, Israel †E-mails: yenzel@huji.ac.il; rivka@gsi.gov.il; t.grodek@gmail.com; judith@vms.huji.ac.il; naomi.porat@gsi.gov.il; pbierman@uvm.edu; jdblum@umich.edu; yerel@vms.huji.ac.il. Search for other works by this author on: GSW Google Scholar Tamir Grodek; Tamir Grodek † 3Department of Geography, The Hebrew University of Jerusalem, Mt. Scopus, Jerusalem 91905, Israel †E-mails: yenzel@huji.ac.il; rivka@gsi.gov.il; t.grodek@gmail.com; judith@vms.huji.ac.il; naomi.porat@gsi.gov.il; pbierman@uvm.edu; jdblum@umich.edu; yerel@vms.huji.ac.il. Search for other works by this author on: GSW Google Scholar Avner Ayalon; Avner Ayalon 2Geological Survey of Israel, 30 Malkhe Israel Street, Jerusalem 95501, Israel Search for other works by this author on: GSW Google Scholar Judith Lekach; Judith Lekach † 3Department of Geography, The Hebrew University of Jerusalem, Mt. Scopus, Jerusalem 91905, Israel †E-mails: yenzel@huji.ac.il; rivka@gsi.gov.il; t.grodek@gmail.com; judith@vms.huji.ac.il; naomi.porat@gsi.gov.il; pbierman@uvm.edu; jdblum@umich.edu; yerel@vms.huji.ac.il. Search for other works by this author on: GSW Google Scholar Naomi Porat; Naomi Porat † 2Geological Survey of Israel, 30 Malkhe Israel Street, Jerusalem 95501, Israel †E-mails: yenzel@huji.ac.il; rivka@gsi.gov.il; t.grodek@gmail.com; judith@vms.huji.ac.il; naomi.porat@gsi.gov.il; pbierman@uvm.edu; jdblum@umich.edu; yerel@vms.huji.ac.il. Search for other works by this author on: GSW Google Scholar Paul Bierman; Paul Bierman † 4Geology Department, University of Vermont, Delehanty Hall, 180 Colchester Avenue, Burlington, Vermont 05405, USA †E-mails: yenzel@huji.ac.il; rivka@gsi.gov.il; t.grodek@gmail.com; judith@vms.huji.ac.il; naomi.porat@gsi.gov.il; pbierman@uvm.edu; jdblum@umich.edu; yerel@vms.huji.ac.il. Search for other works by this author on: GSW Google Scholar Joel D. Blum; Joel D. Blum † 5Department of Geological Sciences, University of Michigan, 1100 N University Avenue, Ann Arbor, Michigan 48109, USA †E-mails: yenzel@huji.ac.il; rivka@gsi.gov.il; t.grodek@gmail.com; judith@vms.huji.ac.il; naomi.porat@gsi.gov.il; pbierman@uvm.edu; jdblum@umich.edu; yerel@vms.huji.ac.il. Search for other works by this author on: GSW Google Scholar Yigal Erel Yigal Erel † 1The Fredy and Nadine Herrmann Institute of Earth Sciences, The Hebrew University of Jerusalem, Edmond J. Safra Campus, GivatRam, Jerusalem 91904, Israel †E-mails: yenzel@huji.ac.il; rivka@gsi.gov.il; t.grodek@gmail.com; judith@vms.huji.ac.il; naomi.porat@gsi.gov.il; pbierman@uvm.edu; jdblum@umich.edu; yerel@vms.huji.ac.il. Search for other works by this author on: GSW Google Scholar Author and Article Information Yehouda Enzel † 1The Fredy and Nadine Herrmann Institute of Earth Sciences, The Hebrew University of Jerusalem, Edmond J. Safra Campus, GivatRam, Jerusalem 91904, Israel Rivka Amit † 2Geological Survey of Israel, 30 Malkhe Israel Street, Jerusalem 95501, Israel Tamir Grodek † 3Department of Geography, The Hebrew University of Jerusalem, Mt. Scopus, Jerusalem 91905, Israel Avner Ayalon 2Geological Survey of Israel, 30 Malkhe Israel Street, Jerusalem 95501, Israel Judith Lekach † 3Department of Geography, The Hebrew University of Jerusalem, Mt. Scopus, Jerusalem 91905, Israel Naomi Porat † 2Geological Survey of Israel, 30 Malkhe Israel Street, Jerusalem 95501, Israel Paul Bierman † 4Geology Department, University of Vermont, Delehanty Hall, 180 Colchester Avenue, Burlington, Vermont 05405, USA Joel D. Blum † 5Department of Geological Sciences, University of Michigan, 1100 N University Avenue, Ann Arbor, Michigan 48109, USA Yigal Erel † 1The Fredy and Nadine Herrmann Institute of Earth Sciences, The Hebrew University of Jerusalem, Edmond J. Safra Campus, GivatRam, Jerusalem 91904, Israel †E-mails: yenzel@huji.ac.il; rivka@gsi.gov.il; t.grodek@gmail.com; judith@vms.huji.ac.il; naomi.porat@gsi.gov.il; pbierman@uvm.edu; jdblum@umich.edu; yerel@vms.huji.ac.il. Publisher: Geological Society of America Received: 08 May 2011 Revision Received: 22 Sep 2011 Accepted: 25 Sep 2011 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2012 Geological Society of America GSA Bulletin (2012) 124 (5-6): 705–722. https://doi.org/10.1130/B30538.1 Article history Received: 08 May 2011 Revision Received: 22 Sep 2011 Accepted: 25 Sep 2011 First Online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Yehouda Enzel, Rivka Amit, Tamir Grodek, Avner Ayalon, Judith Lekach, Naomi Porat, Paul Bierman, Joel D. Blum, Yigal Erel; Late Quaternary weathering, erosion, and deposition in Nahal Yael, Israel: An "impact of climatic change on an arid watershed"?. GSA Bulletin 2012;; 124 (5-6): 705–722. doi: https://doi.org/10.1130/B30538.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract In their seminal paper in 1979, Bull and Schick proposed a conceptual model for the geomorphic response to Pleistocene to Holocene climate change, based on the hyperarid Nahal Yael watershed in the southern Negev Desert. In this model, the change from semiarid late Pleistocene to hyperarid early Holocene climates reduced vegetation cover, increased the yield of sediment from slopes, and accelerated aggradation of terraces and alluvial fans. The model is now over 30 yr old, and during this time, chronologic, paleoenvironmental, and hydrogeomorphic research has advanced. Here, we reevaluate the model using data acquired in Nahal Yael over the 30yr since the original model was proposed. Recent studies indicate that the late Pleistocene climate was hyperarid, and a transition from semiarid to hyperarid climates did not occur. The revised chronology reveals a major 35–20 ka episode of accelerated late Pleistocene sediment production on slopes (with lower rates probably already at ca. 50ka) due to increased frequency of wetting-drying cycles caused by frequent extreme storms and floods between 35 and 27 ka. Without lag time, these sediments were transported and aggraded in depositional landscape components (fluvial terraces and alluvial fans). This intensified sediment production and delivery phase is unrelated to the Pleistocene-Holocene transition. The depositional landforms were rapidly incised between 20 and 18 ka. Since and/or soon after this Last Glacial Maximum (LGM) incision, most material leaving the basin originated from sediments stored in depositional landforms and was not produced from bedrock.Using these new data, we propose a revision to the Bull and Schick model in this hyperarid environment. Our revision suggests that the model should include the frequent storms and floods responsible for a late Pleistocene pulse of intense weathering due to numerous cycles of wetting and drying on slopes and coeval sediment transport to fluvial terraces and alluvial fans. We also discuss the common use and pitfalls of using the Bull and Schick conceptual model to explain observations in diverse arid environments, usually without sufficient data on basin-specific stratigraphic, chronologic, paleoenvironmental, and paleoclimatic information. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.