DOI: 10.5194/cp-10-467-2014
Scopus记录号: 2-s2.0-84896109828
论文题名: Inorganic geochemistry data from Lake El'gygytgyn sediments: Marine isotope stages 6-11
作者: Minyuk P.S. ; Borkhodoev V.Y. ; Wennrich V.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2014
卷: 10, 期: 2 起始页码: 467
结束页码: 485
语种: 英语
Scopus关键词: chemical composition
; concentration (composition)
; data set
; drilling
; environmental change
; glacial deposit
; glaciation
; interglacial
; lacustrine deposit
; marine isotope stage
; sediment chemistry
; sedimentation
; Chukchi
; Elgygytgyn Lake
; Lake Baikal
; Russian Federation
; Siberia
英文摘要: Geochemical analyses were performed on sediments recovered by deep drilling at Lake El'gygytgyn in central Chukotka, northeastern Russia (67 30' N; 172 05' E). Major and rare element concentrations were determined using X-ray fluorescence spectroscopy (XRF) on the < 250 μm fraction from 617 samples dated to ca. 440 and 125 ka, which approximates marine isotope stages (MIS) 11 to 6. The inorganic geochemistry indicates significant variations in elemental composition between glaciations and interglaciations. Interglacial sediments are characterized by high contents of SiO2, Na2O, CaO, K 2O, and Sr and are depleted in Al2O3, Fe2O 3, TiO2, and MgO. An extreme SiO2 enrichment during MIS 11.3 and 9.3 was caused by an enhanced flux of biogenic silica (BSi). The geochemical structure of MIS 11 shows similar characteristics as seen in MIS 11 records from Lake Baikal (southeastern Siberia) and Antarctic ice cores, thereby arguing for the influence of global forcings on these records. High sediment content of TiO2, Fe2O3, MgO, Al 2O3, LOI, Ni, Cr, and Zr typifies glacial stages, with the most marked increases during MIS 7.4 and 6.6. Reducing conditions during glacial times are indicated by peaks in the Fe2O3 content and coinciding low Fe2O3/MnO ratios. This conclusion also is supported by P2O5 and MnO enrichment, indicating an increased abundance of authigenic, fine-grained vivianite. Elemental ratios (CIA, CIW, PIA, and Rb/Sr) indicate that glacial sediments are depleted in mobile elements, like Na, Ca, K and Sr. This depletion was caused by changes in the sedimentation regime and thus reflects environmental changes. © 2014 Author(s). 资助项目: NSF, National Science Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49301
Appears in Collections: 气候变化与战略
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Recommended Citation:
Minyuk P.S.,Borkhodoev V.Y.,Wennrich V.. Inorganic geochemistry data from Lake El'gygytgyn sediments: Marine isotope stages 6-11[J]. Climate of the Past,2014-01-01,10(2)