DOI: 10.5194/cp-9-1933-2013
Scopus记录号: 2-s2.0-84882747043
论文题名: Petrophysical characterization of the lacustrine sediment succession drilled in Lake El'gygytgyn, Far East Russian Arctic
作者: Gebhardt A.C. ; Francke A. ; Kück J. ; Sauerbrey M. ; Niessen F. ; Wennrich V. ; Melles M.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2013
卷: 9, 期: 4 起始页码: 1933
结束页码: 1947
语种: 英语
Scopus关键词: bedrock
; biogenic deposit
; clastic sediment
; diagram
; drilling
; interglacial
; lacustrine deposit
; mass movement
; meteorite
; petrology
; physicochemical property
; redox conditions
; Chukchi
; Elgygytgyn Lake
; Russian Federation
英文摘要: Seismic profiles of Far East Russian Lake El'gygytgyn, formed by a meteorite impact some 3.6 million years ago, show a stratified sediment succession that can be separated into subunits Ia and Ib at approximately 167 m below lake floor (Combining double low line∼3.17 Ma). The upper (Ia) is well-stratified, while the lower is acoustically more massive and discontinuous. The sediments are intercalated with frequent mass movement deposits mainly in the proximal areas, while the distal region is almost free of such deposits at least in the upper part. In spring 2009, a long core drilled in the lake center within the framework of the International Continental Scientific Drilling Program (ICDP) penetrated the entire lacustrine sediment succession down to ∼320 m below lake floor and about 200 m farther into the meteorite-impact-related bedrock. Downhole logging data down to 390 m below lake floor show that the bedrock and the lacustrine part differ significantly in their petrophysical characteristics. The contact between the bedrock and the lacustrine sediments is not abrupt, but rather transitional with a variable mixture of impact-altered bedrock clasts in a lacustrine matrix. Physical and chemical proxies measured on the cores can be used to divide the lacustrine part into five different statistical clusters. These can be plotted in a redox-condition vs. input-type diagram, with total organic carbon content and magnetic susceptibility values indicating anoxic or oxic conditions and with the Si/Ti ratio representing more clastic or more biogenic input. Plotting the clusters in this diagram allows identifying clusters that represent glacial phases (cluster I), super interglacials (cluster II), and interglacial phases (clusters III and IV). © Author(s) 2013. 资助项目: DFG, Deutsche Forschungsgemeinschaft
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49402
Appears in Collections: 气候变化与战略
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Recommended Citation:
Gebhardt A.C.,Francke A.,Kück J.,et al. Petrophysical characterization of the lacustrine sediment succession drilled in Lake El'gygytgyn, Far East Russian Arctic[J]. Climate of the Past,2013-01-01,9(4)