DOI: 10.5194/cp-10-1041-2014
Scopus记录号: 2-s2.0-84901410831
论文题名: Volcanic ash layers in Lake El'gygytgyn: Eight new regionally significant chronostratigraphic markers for western Beringia
作者: Van Den Bogaard C. ; Jensen B.J.L. ; Pearce N.J.G. ; Froese D.G. ; Portnyagin M.V. ; Ponomareva V.V. ; Wennrich V.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2014
卷: 10, 期: 3 起始页码: 1041
结束页码: 1062
语种: 英语
Scopus关键词: Beringia
; chronostratigraphy
; core analysis
; explosive volcanism
; lead isotope
; luminescence
; paleoclimate
; paleoenvironment
; Pleistocene
; Pliocene
; tephra
; tephrochronology
; volcanic ash
; volcanic eruption
; Alaska
; Aleutian Islands
; Arctic
; Bering Sea
; Canada
; Chukchi
; Elgygytgyn Lake
; Kamchatka
; Kuril Islands
; Pacific Ocean
; Pacific Ocean (Northwest)
; Russian Far East
; Russian Federation
; Sakhalin
; United States
; Yukon Territory
英文摘要: Ash layers from explosive volcanic eruptions (i.e., tephra) represent isochronous surfaces independent from the environment in which they are deposited and the distance from their source. In comparison to eastern Beringia (nonglaciated Yukon and Alaska), few Plio-Pleistocene distal tephra are known from western Beringia (non-glaciated arctic and subarctic eastern Russia), hindering the dating and correlation of sediments beyond the limit of radiocarbon and luminescence methods. The identification of eight visible tephra layers (T0-T7) in sediment cores extracted from Lake El'gygytgyn, in the Far East Russian Arctic, indicates the feasibility of developing a tephrostratigraphic framework for this region. These tephra range in age from ca 45 ky to 2.2My old, and each is described and characterized by its major-, minor-, trace-element and Pb isotope composition. These data show that subduction-zone-related volcanism from the Kurile-Kamchatka-Aleutian Arc and Alaska Peninsula is the most likely source, with Pb isotope data indicating a Kamchatkan volcanic source for tephra layers T0-T5 and T7, while a source in the Aleutian Arc is possible for tephra T6. The location of Lake El'gygytgyn relative to potential source volcanoes (>1000 km) suggests these tephra are regionally distributed over a large area. These deposits provide a unique opportunity to correlate the highresolution paleoenvironmental records of Lake El'gygytgyn to other terrestrial paleoenvironmental archives from western Beringia and marine records from the western North Pacific and Bering Sea, and to move towards the development of a robust integrated framework between the continuous paleoclimatic records of Lake El'gygytgyn and other terrestrial and marine records in NE Eurasia. © Author(s) 2014. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49263
Appears in Collections: 气候变化与战略
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Recommended Citation:
Van Den Bogaard C.,Jensen B.J.L.,Pearce N.J.G.,et al. Volcanic ash layers in Lake El'gygytgyn: Eight new regionally significant chronostratigraphic markers for western Beringia[J]. Climate of the Past,2014-01-01,10(3)