DOI: 10.1016/j.quascirev.2016.03.011
Scopus记录号: 2-s2.0-84977126596
论文题名: Do peatlands or lakes provide the most comprehensive distal tephra records?
作者: Watson E.J. ; Swindles G.T. ; Lawson I.T. ; Savov I.P.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 139 起始页码: 110
结束页码: 128
语种: 英语
英文关键词: Basalt
; Cryptotephra
; Holocene
; Northern Europe
; Tephrochronology
Scopus关键词: Basalt
; Catchments
; Fallout
; Stratigraphy
; Wetlands
; Chemical alteration
; Cryptotephra
; Holocenes
; Mid to late Holocene
; Northern Europe
; Stratigraphic sequences
; Tephrochronology
; Tephrostratigraphy
; Lakes
; arctic environment
; basalt
; geological record
; Holocene
; lacustrine deposit
; peatland
; sequence stratigraphy
; tephra
; tephrochronology
; Sweden
英文摘要: Despite the widespread application of tephra studies for dating and correlation of stratigraphic sequences ('tephrochronology'), questions remain over the reliability and replicability of tephra records from lake sediments and peats, particularly in sites >1000 km from source volcanoes. To address this, we examine the tephrostratigraphy of four pairs of lake and peatland sites in close proximity to one another (<10 km), and evaluate the extent to which the microscopic (crypto-) tephra records in lakes and peatlands differ. The peatlands typically record more cryptotephra layers than nearby lakes, but cryptotephra records from high-latitude peatlands can be incomplete, possibly due to tephra fallout onto snow and subsequent redistribution across the peatland surface by wind and during snowmelt. We find no evidence for chemical alteration of glass shards in peatland or lake environments over the time scale of this study (mid-to late- Holocene). Instead, the low number of basaltic cryptotephra layers identified in distal peatlands reflects the capture of only primary tephra-fall, whereas lakes concentrate tephra falling across their catchments which subsequently washes into the lake, adding to the primary tephra fallout received in the lake. A combination of records from both lakes and peatlands must be used to establish the most comprehensive and complete regional tephrostratigraphies. We also describe two previously unreported late Holocene cryptotephras and demonstrate, for the first time, that Holocene Icelandic ash clouds frequently reached Arctic Sweden. © 2016 The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59613
Appears in Collections: 过去全球变化的重建
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作者单位: School of Geography, University of Leeds, Leeds, United Kingdom; Department of Geography and Sustainable Development, University of St Andrews, St Andrews, United Kingdom; School of Earth and Environment, University of Leeds, Leeds, United Kingdom
Recommended Citation:
Watson E.J.,Swindles G.T.,Lawson I.T.,et al. Do peatlands or lakes provide the most comprehensive distal tephra records?[J]. Quaternary Science Reviews,2016-01-01,139