DOI: 10.1016/j.quascirev.2013.10.033
Scopus记录号: 2-s2.0-84888374720
论文题名: The younger dryas impact hypothesis: A critical review
作者: Van Hoesel A. ; Hoek W.Z. ; Pennock G.M. ; Drury M.R.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 83 起始页码: 95
结束页码: 114
语种: 英语
英文关键词: Iridium
; Lechatelierite
; Magnetic spherules
; Nanodiamonds
; Radiocarbon dating
; Wildfire
; Younger Dryas impact hypothesis
Scopus关键词: Fires
; Iridium
; Quartz
; Lechatelierite
; Magnetic spherules
; Radiocarbon dating
; Wildfire
; Younger Dryas
; Nanodiamonds
; climate variation
; cooling
; critical analysis
; extinction
; impact structure
; iridium
; lechatelierite
; quartz
; radiocarbon dating
; spherule
; wildfire
; Younger Dryas
; Spherules
英文摘要: The Younger Dryas impact hypothesis suggests that multiple extraterrestrial airbursts or impacts resulted in the Younger Dryas cooling, extensive wildfires, megafaunal extinctions and changes in human population. After the hypothesis was first published in 2007, it gained much criticism, as the evidence presented was either not indicative of an extraterrestrial impact or not reproducible by other groups. Only three years after the hypothesis had been presented, a requiem paper was published. Despite this, the controversy continues. New evidence, both in favour and against the hypothesis, continues to be published. In this review we briefly summarize the earlier debate and critically analyse the most recent reported evidence, including magnetic microspherules, nanodiamonds, and iridium, shocked quartz, scoria-like objects and lechatelierite. The subsequent events proposed to be triggered by the impact event, as well as the nature of the event itself, are also briefly discussed. In addition we address the timing of the Younger Dryas impact, a topic which, despite its importance, has not gained much attention thus far. We show that there are three challenges related to the timing of the event: accurate age control for some of the sites that are reported to provide evidence for the impact, linking these sites to the onset of the Younger Dryas and, most importantly, an apparent age discrepancy of up to two centuries between different sites associated with the proposed impact event. We would like to stress that if the markers at different locations have been deposited at different points in time, they cannot be related to the same event. Although convincing evidence for the hypothesis that multiple synchronous impacts resulted in massive environmental changes at ~12,900yrs ago remains debatable, we conclude that some evidence used to support the Younger Dryas impact hypothesis cannot fully be explained at this point in time. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60419
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth Sciences, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, Netherlands; Department of Physical Geography, Utrecht University, Heidelberglaan 2, 3584 CS Utrecht, Netherlands
Recommended Citation:
Van Hoesel A.,Hoek W.Z.,Pennock G.M.,et al. The younger dryas impact hypothesis: A critical review[J]. Quaternary Science Reviews,2014-01-01,83