DOI: 10.1016/j.quascirev.2019.02.014
Scopus记录号: 2-s2.0-85062012658
论文题名: 40 Ar/ 39 Ar dating of the Thorsmork ignimbrite and Icelandic sub-glacial rhyolites
作者: Guillou H. ; Scao V. ; Nomade S. ; Van Vliet-Lanoë B. ; Liorzou C. ; Guðmundsson Á.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2019
卷: 209 起始页码: 52
结束页码: 62
语种: 英语
英文关键词: 40 Ar/ 39 Ar
; Geochronology
; Rhyolite
; Rhyolite
; Sub-glacial volcanism
; Thorsmork
Scopus关键词: Geochronology
; Glacial geology
; Granite
; Ice
; Numerical methods
; Stratigraphy
; Submarine geology
; Trace elements
; Accuracy and precision
; Major and trace elements
; Rhyolite
; Rhyolitic eruptions
; Stratigraphic markers
; Sub-glacial volcanism
; Thorsmork
; ^40Ar/^39Ar
; Sediments
英文摘要: Robust correlation of paleoclimatic archives (e.g. marine sediments, ice, speleothems) necessitates an increase of the number of independent and accurately dated stratigraphic markers using numerical methods. Icelandic rhyolitic volcanism has a strong chronological interest because these products are found as tephra in the North Atlantic marine archives as well as in Greenland ice cores. In this study, we have dated, using the 40 Ar/ 39 Ar method, subglacial rhyolites of the Tindfjallajökull, Kerlingarfjöll and Torfajökull volcanoes which are the main sources of rhyolitic tephra identified in marine and glaciological records. The Thorsmork ignimbrite (Tindfjallajökull) which correlates with the rhyolitic component (II-RHY-1) of the North Atlantic Ash Zone II (NAAZ II) layer is dated at 55.6 ± 2.4 ka, an age that agrees with the ones given by the ice core chronologies (GICC05: 55.4 ± 1.2 ka). The eruptions of Rauðfossafjöll and Fannborg are respectively dated at 77.0 ± 3.0 ka and 149.3 ± 3.4 ka. These new ages along with the published ones confirm, as already concluded by Flude et al. (2010) that there is no clear evidence, at least at the latitude of Iceland, that climate warming is the main mechanism that triggered rhyolitic eruptions. Combining major and trace element compositions with our new age determinations, it appears that the Rauðfossafjöll and the Snaefell rhyolitic eruptions have not yet been discovered in marine sediment cores. Nevertheless, given the accuracy and precision of our dating, these rhyolitic eruptions have the potential to become chronostratigraphic markers, once tephra shards corresponding to these eruptions are discovered in ice and or marine sediment records. The Fannborg eruption might be recorded in the marine core LINK 16 during MIS 6 prior to the transition to MIS5e. © 2019 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117356
Appears in Collections: 气候变化与战略
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Recommended Citation:
Guillou H.,Scao V.,Nomade S.,et al. 40 Ar/ 39 Ar dating of the Thorsmork ignimbrite and Icelandic sub-glacial rhyolites[J]. Quaternary Science Reviews,2019-01-01,209