Arid
DOI10.1016/S0341-8162(99)00049-1
Response of alluvial fan systems to the late Pleistocene to Holocene climatic transition: contrasts between the margins of pluvial Lakes Lahontan and Mojave, Nevada and California, USA
Harvey, AM; Wigand, PE; Wells, SG
通讯作者Harvey, AM
来源期刊CATENA
ISSN0341-8162
出版年1999
卷号36期号:4页码:255-281
英文摘要

Dated shorelines of late Pleistocene pluvial Lakes Lahontan (Great Basin Desert, northwest Nevada) and Mojave (Mojave Desert, eastern California) provide timelines for the assessment of alluvial fan sedimentation at the lake margins during the late Pleistocene to early Holocene. Two sets of alluvial fan systems have been mapped: the Stillwater fans, feeding Lake Lahontan; and the Zzyzx fans, feeding Lake Mojave. Their contrasting morphologies suggest different responses of the two fan systems to late Pleistocene to early Holocene climatic change. At the time the Stillwater fan systems underwent minimal sedimentation, with the catchment hillslopes apparently stable. The Zzyzx fans experienced major changes in water and sediment supply from the catchment hillslopes. There was a major phase of hillslope debris-flow activity, followed by fanhead trenching and distal fan progradation. Both areas were wetter and colder in the late Pleistocene than they are today, but during the transition to the Holocene the Zzyzx area was more likely to experience intense rains associated with the monsoonal penetration of warm moist tropical air into the Southwest. Vegetation reconstructions for the late Pleistocene to the early Holocene suggest that catchment hillslopes in the Mojave supported a desert shrub vegetation, but those in the Stillwaters supported juniper woodland and grasses at low elevations and pine at higher elevations. Contrasts in hillslope vegetation cover together with storm activity may account for the different responses of the alluvial fans to climatic change during the Pleistocene to Holocene climatic transition. After the fails in lake levels of Lakes Lahontan and Mojave in the early Holocene, both areas underwent aridification, resulting in reductions in hillslope vegetation cover. Increased storm runoff led to fanhead trenching and distal progradation of the alluvial fans. Variations in fan style at that time may relate primarily to base-level conditions resulting from different gradients on the exposed lake shores. (C) 1999 Published by Elsevier Science B.V. All rights reserved.


英文关键词alluvial fans pluvial Lake Lahontan pluvial Lake Mojave late Pleistocene climates palaeovegetation
类型Article
语种英语
国家England ; USA
收录类别SCI-E
WOS记录号WOS:000081022700001
WOS关键词SOUTHWESTERN UNITED-STATES ; GREAT-BASIN ; PEDOGENIC PROCESSES ; DESERT PIEDMONT ; QUATERNARY ; PAVEMENTS ; AGE ; EVOLUTION ; SURFACES ; DYNAMICS
WOS类目Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向Geology ; Agriculture ; Water Resources
来源机构Desert Research Institute
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/137100
作者单位(1)Univ Liverpool, Dept Geog, Liverpool L69 3BX, Merseyside, England;(2)Univ Nevada, Desert Res Inst, Quaternary Sci Ctr, Reno, NV 89506 USA
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GB/T 7714
Harvey, AM,Wigand, PE,Wells, SG. Response of alluvial fan systems to the late Pleistocene to Holocene climatic transition: contrasts between the margins of pluvial Lakes Lahontan and Mojave, Nevada and California, USA[J]. Desert Research Institute,1999,36(4):255-281.
APA Harvey, AM,Wigand, PE,&Wells, SG.(1999).Response of alluvial fan systems to the late Pleistocene to Holocene climatic transition: contrasts between the margins of pluvial Lakes Lahontan and Mojave, Nevada and California, USA.CATENA,36(4),255-281.
MLA Harvey, AM,et al."Response of alluvial fan systems to the late Pleistocene to Holocene climatic transition: contrasts between the margins of pluvial Lakes Lahontan and Mojave, Nevada and California, USA".CATENA 36.4(1999):255-281.
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