气候变化领域集成服务门户(CCPortal): Marker tephra in Haukadalsvatn lake sediment: A key to the Holocene tephra stratigraphy of northwest Iceland

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DOI	10.1016/j.quascirev.2019.07.019
	Marker tephra in Haukadalsvatn lake sediment: A key to the Holocene tephra stratigraphy of northwest Iceland
	Harning D.J.; Thordarson T.; Geirsdóttir Á.; Ólafsdóttir S.; Miller G.H.
发表日期	2019
ISSN	0277-3791
起始页码	154
结束页码	170
卷号	219
英文摘要	Emerging lake sediment records are rapidly improving Iceland‘s Holocene tephra stratigraphy and chronology. Here, we expand upon these recent developments with a securely-dated tephrochronological record from the lake Haukadalsvatn in West Iceland. We capitalize on the existing paleomagnetic secular variation (PSV) age model, which uses 54 ties points to synchronize Haukadalsvatn‘s high-resolution lake sediment record to a well-dated PSV master chronology from North Iceland Shelf marine core MD99-2269. Major element composition permits the identification of 38 tephra layers over the last 10500 years. Of these tephra, 15 can be traced to tephra found on the Vestfirðir peninsula and represent a series of well-dated marker tephra for West and Northwest Iceland that feature precise geochemical fingerprints. Based on these premises, and in contrast to recent assertations, there is no firm evidence for the presence of the presumed Middle Holocene „Hekla Ö tephra” in West or Northwest Iceland. Despite their close geographical locations, comparison of Haukadalsvatn‘s tephra layer frequency record to that of Northwest Iceland‘s reveals different trends. This regional disparity is likely the result of predominately small eruptions that featured narrower ash plumes. We argue that Haukadalsvatn serves as an important template for the tephrochronology of West Iceland and for future studies investigating the tephra records in more distal regions of the northwest North Atlantic, such as Greenland. © 2019 Elsevier Ltd
英文关键词	Holocene; Iceland; Lake sediment; PSV; Tephra
语种	英语
scopus关键词	Sediments; Stratigraphy; Geochemical fingerprints; Geographical locations; Holocenes; Icelands; Lake sediments; Lake-sediment records; Paleomagnetic secular variations; Tephra; Lakes; biomarker; historical record; Holocene; lacustrine deposit; secular variation; stratigraphy; tephra; tephrochronology; Arctic; Atlantic Ocean; Atlantic Ocean (North); Greenland; Haukadalsvatn; Iceland; Iceland Shelf; Vestfirdir
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151816
作者单位	Faculty of Earth Sciences, University of Iceland, Reykjavík, Iceland; INSTAAR and Department of Geological Sciences, University of Colorado BoulderCO, United States
推荐引用方式 GB/T 7714	Harning D.J.,Thordarson T.,Geirsdóttir Á.,et al. Marker tephra in Haukadalsvatn lake sediment: A key to the Holocene tephra stratigraphy of northwest Iceland[J],2019,219.
APA	Harning D.J.,Thordarson T.,Geirsdóttir Á.,Ólafsdóttir S.,&Miller G.H..(2019).Marker tephra in Haukadalsvatn lake sediment: A key to the Holocene tephra stratigraphy of northwest Iceland.Quaternary Science Reviews,219.
MLA	Harning D.J.,et al."Marker tephra in Haukadalsvatn lake sediment: A key to the Holocene tephra stratigraphy of northwest Iceland".Quaternary Science Reviews 219(2019).