气候变化领域集成服务门户(CCPortal): Global K-Pg Layer Deposited From a Dust Cloud

CCPortal

DOI	10.1029/2019GL086562
	Global K-Pg Layer Deposited From a Dust Cloud
	Artemieva N.; Morgan J.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:6
英文摘要	Although it is widely agreed that the distal K-Pg clay layer contains ejecta from the Chicxulub impact site, no current models can explain how these ejecta travel from the impact site around the globe. A widely accepted hypothesis is that impact spherules and shocked minerals in the layer were ejected from an expanding impact plume and traveled to their final destination on a ballistic path. Shocked minerals, however, are ejected at too low a velocity to reach distal sites, and plausible ballistic ejection models cannot explain the observed ejecta distribution. Using a suite of numerical simulations, we find that intense interactions between the ejecta curtain and atmosphere generate a fast-moving dust cloud traveling at speeds of a few kilometers per second, which carries a substantial fraction of ejecta, including shocked minerals, to distal sites. We conclude that ejecta curtain material must make a major contribution to the formation of the distal K-Pg layer. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Ballistics; Minerals; Models; Chicxulub; Chicxulub impact; crater; Current models; Dust clouds; ejecta; Impact site; Impact spherules; Dust; cloud; crater; dust; ejecta; modeling; numerical model; simulation
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170552
作者单位	Planetary Science Institute, Tucson, AZ, United States; Department of Earth Science and Engineering, Imperial College London, London, United Kingdom
推荐引用方式 GB/T 7714	Artemieva N.,Morgan J.. Global K-Pg Layer Deposited From a Dust Cloud[J],2020,47(6).
APA	Artemieva N.,&Morgan J..(2020).Global K-Pg Layer Deposited From a Dust Cloud.Geophysical Research Letters,47(6).
MLA	Artemieva N.,et al."Global K-Pg Layer Deposited From a Dust Cloud".Geophysical Research Letters 47.6(2020).