气候变化领域集成服务门户(CCPortal): Proximal cretaceous-tertiary boundary impact deposits in the Caribbean

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DOI	10.1126/science.248.4957.843
	Proximal cretaceous-tertiary boundary impact deposits in the Caribbean
	Hildebrand A.R.; Boynton W.V.
发表日期	1990
ISSN	0036-8075
起始页码	843
结束页码	847
卷号	248 期号:4957
英文摘要	Trace element, isotopic, and mineralogic studies indicate that the proposed impact at the Cretaceous-Tertiary (K-T) boundary occurred in an ocean basin, although a minor component of continental material is required. The size and abundance of shocked minerals and the restricted geographic occurrence of the ejecta layer and impact-wave deposits suggest an impact between the Americas. Coarse boundary sediments at sites 151 and 153 in the Colombian Basin and 5- to 450-meter-thick boundary sediments in Cuba may be deposits of a giant wave produced by a nearby oceanic impact. On the southern peninsula of Haiti, a ∼50-centimeter-thick ejecta layer occurs at the K-T boundary. This ejecta layer is ∼25 times as thick as that at any known K-T site and suggests an impact site within ∼1000 kilometers. Seismic reflection profiles suggest that a buried ∼300-km-diameter candidate structure occurs in the Colombian Basin.
英文关键词	Cretaceous/Tertiary boundary; ejecta layer; impact deposit; tsunami deposit; Caribbean; Cuba; Haiti
语种	英语
来源期刊	Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/244010
作者单位	Department of Planetary Sciences, University of Arizona, Tucson, AZ 85721
推荐引用方式 GB/T 7714	Hildebrand A.R.,Boynton W.V.. Proximal cretaceous-tertiary boundary impact deposits in the Caribbean[J],1990,248(4957).
APA	Hildebrand A.R.,&Boynton W.V..(1990).Proximal cretaceous-tertiary boundary impact deposits in the Caribbean.Science,248(4957).
MLA	Hildebrand A.R.,et al."Proximal cretaceous-tertiary boundary impact deposits in the Caribbean".Science 248.4957(1990).