Arid
DOI10.1017/S0954102000000171
Sedimentology and geochemistry of a perennially ice-covered epishelf lake in Bunger Hills Oasis, East Antarctica
Doran, PT; Wharton, RA; Lyons, WB; Des Marais, DJ; Andersen, DT
通讯作者Doran, PT
来源期刊ANTARCTIC SCIENCE
ISSN0954-1020
出版年2000
卷号12期号:2页码:131-140
英文摘要

A process-oriented study was carried out in White Smoke lake, Bunger Hills, East Antarctica, a perennially ice-covered (1.8 to 2.8 m thick) epishelf (tidally-forced) lake. The lake water has a low conductivity and is relatively well mixed. Sediments are transferred from the adjacent glacier to the lake when glacier ice surrounding the sediment is sublimated at the surface and replaced by accumulating ice from below. The lake bottom at the west end of the lake is mostly rocky with a scant sediment cover. The east end contains a thick sediment profile. Grain size and delta(13)C increase with sediment depth, indicating a more proximal glacier ill the past. Sedimentary Pb-210 and Cs-137 signals are exceptionally strong, probably a result of the focusing effect of the large glacial catchment area. The post-bomb and pre-bomb radiocarbon reservoirs are c. 725 C-14 yr and c. 1950 C-14 yr, respectively. Radiocarbon dating indicates that the east end of the lake is >3 ka sp, while photographic evidence and the absence of sediment cover indicate that the west end has formed only over the last century. Our results indicate that the southern ice edge of Bunger Hills has been relatively stable with only minor fluctuations (on the scale of hundreds of metres) over the last 3000 years.


英文关键词Antarctic geochemistry isotopes lake radiocarbon sedimentology
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000087775400002
WOS关键词MCMURDO DRY VALLEYS ; HOARE ; SEDIMENTATION ; DEGLACIATION ; LIFE ; SNOW
WOS类目Environmental Sciences ; Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向Environmental Sciences & Ecology ; Physical Geography ; Geology
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/2XILL650/138553
作者单位(1)Univ Illinois, Chicago, IL 60607 USA;(2)Univ Nevada, Desert Res Inst, Ctr Biol Sci, Reno, NV 89506 USA;(3)Univ Alabama, Dept Geol, Tuscaloosa, AL 35487 USA;(4)NASA, Ames Res Ctr, Moffett Field, CA 94035 USA
推荐引用方式
GB/T 7714
Doran, PT,Wharton, RA,Lyons, WB,et al. Sedimentology and geochemistry of a perennially ice-covered epishelf lake in Bunger Hills Oasis, East Antarctica[J]. Desert Research Institute,2000,12(2):131-140.
APA Doran, PT,Wharton, RA,Lyons, WB,Des Marais, DJ,&Andersen, DT.(2000).Sedimentology and geochemistry of a perennially ice-covered epishelf lake in Bunger Hills Oasis, East Antarctica.ANTARCTIC SCIENCE,12(2),131-140.
MLA Doran, PT,et al."Sedimentology and geochemistry of a perennially ice-covered epishelf lake in Bunger Hills Oasis, East Antarctica".ANTARCTIC SCIENCE 12.2(2000):131-140.
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