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| 題名: | Quaternary morphotectonic mapping of the Wadi Araba and implications for the tectonic activity of the southern Dead Sea fault |
| 作者: | 波玫琳;Le Béon, Maryline;Klinger, Yann;Mériaux, Anne-Sophie;Al-Qaryouti, Mahmoud;Finkel, Robert C.;Mayyas, Omar;Tapponnier, Paul |
| 貢獻者: | 地球科學學院應用地質研究所 |
| 關鍵詞: | 10Be;Dead Sea fault;Earth Sciences;fault slip rate;Geological time;geomorphology;Plate tectonics;Pleistocene;Quaternary;Sciences of the Universe;Wadi Araba |
| 日期: | 2012-10-01 |
| 上傳時間: | 2026-04-23 15:00:41 (UTC+8) |
| 出版者: | Wiley-Blackwell;Washington: Blackwell Publishing Ltd |
| 摘要: | 摘要： The Dead Sea strike‐slip fault accommodates the northward motion of Arabia relative to Sinai at a rate of ∼5 mm/yr. The southern segment of the fault, the Wadi Araba fault, runs along a valley blanketed in Quaternary sediments. We first focused on understanding the relative and absolute timing of emplacement of the alluvial surfaces. We then determined the probable source of the sediments before assessing their lateral offset to constrain the late Pleistocene fault slip rate. Seven successive morphostratigraphic levels were identified. At two sites, we recognized an alluvial sequence of five to seven successive levels with ages getting younger northward, a pattern consistent with the western block moving southward relative to two fixed feeding channels located to the east. Surface samples were collected for10Be cosmogenic radionuclide dating. Fans F3 and F5 were found to be synchronous from site to site, at 102 ± 26 ka and 324 ± 22 ka, respectively, while F4 could be dated at 163 ± 19 ka at one site only. These are minimum ages, assuming no erosion of the alluvial surfaces. At least two of these periods are correlated with wet periods that are regionally well documented. Further analyses of tectonic offsets are affected in most cases by large uncertainties due to the configuration of the sites. They indicate maximum offsets of ∼5.5 km for the oldest, possibly ∼1 Ma old, surfaces. They lead to bracketing of the fault slip rate between 5 and 12 mm/yr, with preferred values of 5–7 mm/yr, for the last 300 ka. Key Points We established relative and absolute timing of emplacement of large alluvial surfaces We determined tentative but consistent tectonic offsets Our new data together with previous studies favor a fault slip rate of 5‐7 mm/yr
其他題名： Tectonics
出版者： Washington: Blackwell Publishing Ltd
出版日期： 2012-10
出處： Tectonics (Washington, D.C.), 2012-10, Vol.31 (5), p.n/a
資源來源： Wiley Online Library All Journals
版權： Published in 2012 by the American Geophysical Union
版權： licence_http://creativecommons.org/publicdomain/zero
識別號： ISSN: 0278-7407
識別號： ISSN: 1944-9194
識別號： EISSN: 1944-9194
識別號： DOI: 10.1029/2012TC003112
識別號： CODEN: TCTNDM |
| 顯示於類別: | [應用地質研究所] 期刊論文
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