DOI: 10.1016/j.quascirev.2014.01.003
Scopus记录号: 2-s2.0-84893508169
论文题名: Late Quaternary alluvial fans at the eastern end of the San Bernardino Mountains, Southern California
作者: Owen L.A. ; Clemmens S.J. ; Finkel R.C. ; Gray H.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 87 起始页码: 114
结束页码: 134
语种: 英语
英文关键词: Alluvial fans
; American Southwest
; Be-10 terrestrial cosmogenic dating
; Climate change
; Erosion
; Sedimentation
Scopus关键词: Alluvial fans
; American Southwest
; Cosmogenic dating
; Marine isotope stages
; Sediment transfers
; Southern California
; Surface exposure dating
; Terrestrial cosmogenic nuclides
; Climate change
; Debris
; Deposition
; Erosion
; Faulting
; Glacial geology
; Isotopes
; Rivers
; Sedimentation
; Sediments
; Landforms
; alluvial fan
; climate change
; drainage
; erosion
; flash flood
; geomorphology
; Holocene
; Last Glacial Maximum
; Quaternary
; sediment transport
; sedimentation
; sedimentology
; succession
; California
; San Bernardino
; United States
; Whitewater River
英文摘要: Alluvial fans at the eastern end of the San Bernardino Mountains in Southern California provide a record of climate modulated sediment transfer and erosion, and are deformed and displaced in places by active faults. Alluvial fans within two study areas, the Mission Creek and the Whitewater River drainages, were examined using geomorphic, sedimentological, and 10Be terrestrial cosmogenic nuclide (TCN) surface exposure methods to define the timing of alluvial fan formation and erosion, and to examine the role of climatic, tectonic and autocyclic processes. These alluvial fan complexes were studied because they are amongst the best-preserved successions of alluvial fans in southern California and they are located at the mouths of two of the largest drainages, Whitewater River and Mission Creek, in the San Bernardino Mountains and traverse major faults, the Mission Creek and Banning. The alluvial fans comprise bouldery debris deposits that represent deposition dominated by flash flood and debris flow events. TCN surface exposure dating indicates that abandonment/incision of alluvial fan surfaces date to early in the Last Glacial or more likely the penultimate glacial cycle, to marine isotope stage (MIS) 4, and to the Holocene. The lack of alluvial fan ages during the latter part of the Last Glacial (MIS 2 and 3) suggests that there has been little alluvial fan lobe deposition/incision during that time. This is similar to findings for many other alluvial fans throughout the American Southwest, and supports the view that there is a strong climatic control on alluvial fan formation throughout this region. Furthermore, the oldest alluvial fan surfaces in the Mission Creek region are beheaded by the Whitewater River drainage, showing that the oldest alluvial fans in the Mission Creek region underwent significant capture by the Whitewater River drainage. This shows the autocyclic controls are also important on alluvial fan evolution in this region; but the importance of these processes to alluvial fan development in other regions of the American Southwest needs to be more fully assessed. The alluvial fans in the Mission Creek area traverse the Mission Creek fault, but are not deformed by it, which suggests that there may have been little if any movement along this fault since at least MIS 4. In contrast, alluvial fans in the Whitewater River study are displaced by active faults highlighting the influence of tectonism on alluvial fan development in this region. In addition to illustrating the importance of climatic controls on the development of alluvial fans in the American Southwest, a classic region for alluvial fan studies, this study illustrates the complex mixture of autocyclic and allocyclic factors that force alluvial fan development in tectonically active settings. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60365
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geology, University of Cincinnati, Cincinnati, OH 45221, United States; Science Department, Welsh Government, Rhodfa Padarn, Llanbadarn Fawr, Aberystwyth, Ceredigion SY23 3UR, United Kingdom; Department of Earth and Planetary Sciences, University of California, Berkeley, CA 94720, United States
Recommended Citation:
Owen L.A.,Clemmens S.J.,Finkel R.C.,et al. Late Quaternary alluvial fans at the eastern end of the San Bernardino Mountains, Southern California[J]. Quaternary Science Reviews,2014-01-01,87