DOI: 10.1016/j.gloplacha.2015.12.016
论文题名: A new Eemian record of Antarctic tephra layers retrieved from the Talos Dome ice core (Northern Victoria Land)
作者: Narcisi B. ; Petit J.R. ; Langone A. ; Stenni B.
刊名: Global and Planetary Change
ISSN: 0921-8181
出版年: 2016
卷: 137 起始页码: 69
结束页码: 78
语种: 英语
英文关键词: Antarctic ice cores
; Glass shard microanalysis
; Last Interglacial
; Northern Victoria Land volcanism
; Tephra layers
; Tephrostratigraphy
Scopus关键词: Domes
; Geochemistry
; Glacial geology
; Glass
; Particle size
; Stratigraphy
; Volcanoes
; Antarctic ice core
; Glass shards
; Last interglacial
; Northern Victoria Land volcanism
; Tephra layers
; Tephrostratigraphy
; Ice
英文摘要: Polar ice sheets are remarkable repositories of tephra layers. The Talos Dome ice core (72°49'S, 159°11'E), drilled at the edge of the East Antarctic Plateau, close to Late Quaternary volcanoes, offers considerable potential to extend the current tephra time-stratigraphic framework. A tephrochronological study was undertaken of the ice core sections related to the Last Interglacial and the transition to the subsequent glacial period. Thirteen macroscopically visible layers, interpreted to be related to primary deposition of fallout tephra, have been analysed for quantitative grain size and glass shard geochemistry. The layers, precisely framed within the climate (δ18O) record for the core, span in age from 111.6±1.9 to 123.3±2.2ka. Coarse particle size suggests origin from regional sources. Indeed, the vast majority of the samples display an alkaline affinity and trachytic composition that are both typical geochemical features of rifting Antarctic volcanism. Using subtle differences in the geochemical signatures and the comparison with data from previous studies, a few layers are attributed to known coeval Mt. Melbourne eruptions. Another sample subset is consistent with derivation from The Pleiades and Mt. Rittmann volcanoes. One peculiar trachytic glass population appears to be related to activity of the more distant Marie Byrd Land volcanoes. The newly detected tephras provide stratigraphic markers that could facilitate future synchronisation and dating of palaeoclimatic records. The Talos Dome tephra inventory also contributes significantly to the reconstruction of the Northern Victoria Land explosive volcanism, for which chronostratigraphic data for the Last Interglacial temporal segment are poor. © 2015 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84953299441&doi=10.1016%2fj.gloplacha.2015.12.016&partnerID=40&md5=5b60a81e27bd960ae500fb477acb33cb
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11719
Appears in Collections: 全球变化的国际研究计划 气候变化与战略
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作者单位: ENEA, C.R. Casaccia, Roma, Italy
Recommended Citation:
Narcisi B.,Petit J.R.,Langone A.,et al. A new Eemian record of Antarctic tephra layers retrieved from the Talos Dome ice core (Northern Victoria Land)[J]. Global and Planetary Change,2016-01-01,137.