Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/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
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ISSN | 0341-8162 |
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 |
推荐引用方式 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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