DOI: 10.1016/j.quascirev.2016.04.014
Scopus记录号: 2-s2.0-84963894312
论文题名: West Coast volcanic ashes provide a new continental-scale Lateglacial isochron
作者: Pyne-O'Donnell S.D.F. ; Cwynar L.C. ; Jensen B.J.L. ; Vincent J.H. ; Kuehn S.C. ; Spear R. ; Froese D.G.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 142 起始页码: 16
结束页码: 25
语种: 英语
英文关键词: Geochemical correlation
; Glacier Peak
; Lateglacial
; Mount St Helens
; North America
; Tephra
Scopus关键词: Atmospheric chemistry
; Plants (botany)
; Stratigraphy
; Volcanoes
; Geochemical correlation
; Lateglacial
; Mount St Helens
; North America
; Tephra
; Glacial geology
; chronology
; climate effect
; coastal zone
; geochemical survey
; Holocene
; ice sheet
; interglacial
; Last Glacial
; paleoenvironment
; tephra
; volcanic ash
; Cascade Range
; Glacier Peak
; Mount Saint Helens
; United States
; Washington [United States]
; Animalia
英文摘要: The 'Lateglacial' period (~14.7-11.7 cal ka BP) eruptions of Mount St Helens and Glacier Peak in the Cascade Range deposited ash layers (tephras) within a short time span across much of western North America where they form event-stratigraphic marker layers or isochrons. They were deposited at a time which has long been of interest because it represents the transition between two fundamental states of the climate system: the late Pleistocene glacial world when ice sheets were widespread, and the modern interglacial Holocene world. This transition was marked by rapid changes in the distribution of plants, animals and humans on the landscape, and is characterised by short, rapid climate reversals in the warming trend. Yet despite the importance of understanding this period for many areas of palaeoclimatology, palaeobotany and archaeology it remains one of the most difficult for which to develop accurate chronologies because of fluctuations in atmospheric radiocarbon concentration. Hence, the occurrences of distinctive tephra isochrons are valuable for chronological control. Here, we report the first detection of the Mount St Helens set J and Glacier Peak tephras as closely-spaced 'cryptotephra' layers (not visible in stratigraphy to the naked eye) in three eastern seaboard lakes and dated to 13.74-13.45 cal ka BP. The presence of these tephras >4000 km from their sources affords an opportunity for continent-wide correlations by providing a high-precision chronological benchmark that is otherwise often lacking in North American studies of palaeoenvironmental change and deglaciation, megafaunal extinction and palaeoindian colonisation. © 2016 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59587
Appears in Collections: 过去全球变化的重建
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作者单位: School of Geography, Archaeology and Palaeoecology, Queen's University Belfast, Belfast, United Kingdom; Department of Biology, University of New Brunswick, Fredericton, NB, Canada; Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB, Canada; Department of Physical Science, Concord University, Athens, WV, United States; Department of Biology, State University of New York at Geneseo, 1 College Circle, Geneseo, NY, United States; Royal Alberta Museum, Edmonton, AB, Canada
Recommended Citation:
Pyne-O'Donnell S.D.F.,Cwynar L.C.,Jensen B.J.L.,et al. West Coast volcanic ashes provide a new continental-scale Lateglacial isochron[J]. Quaternary Science Reviews,2016-01-01,142