气候变化领域集成服务门户(CCPortal): Australasian impact crater buried under the Bolaven volcanic field; Southern Laos

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DOI	10.1073/pnas.1904368116
	Australasian impact crater buried under the Bolaven volcanic field; Southern Laos
	Sieh K.; Herrin J.; Jicha B.; Angel D.S.; Moore J.D.P.; Banerjee P.; Wiwegwin W.; Sihavong V.; Singer B.; Chualaowanich T.; Charusiri P.
发表日期	2020
ISSN	0027-8424
起始页码	1346
结束页码	1353
卷号	117 期号:3
英文摘要	The crater and proximal effects of the largest known young meteorite impact on Earth have eluded discovery for nearly a century. We present 4 lines of evidence that the 0.79-Ma impact crater of the Australasian tektites lies buried beneath lavas of a long-lived, 910-km3 volcanic field in Southern Laos: 1) Tektite geochemistry implies the presence of young, weathered basalts at the site at the time of the impact. 2) Geologic mapping and 40Ar-39Ar dates confirm that both pre- and postimpact basaltic lavas exist at the proposed impact site and that postimpact basalts wholly cover it. 3) A gravity anomaly there may also reflect the presence of a buried ∼;17 × 13-km crater. 4) The nature of an outcrop of thick, crudely layered, bouldery sandstone and mudstone breccia 10-20 km from the center of the impact and fractured quartz grains within its boulder clasts support its being part of the proximal ejecta blanket. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Australasian; Crater; Impact; Lao; Tektite
语种	英语
scopus关键词	iridium; Article; astronomy; crater; geochemical analysis; geochemistry; gravity; Laos; priority journal; sediment; volcano
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160321
作者单位	Sieh, K., Earth Observatory of Singapore, Nanyang Technological University, Singapore, 639798, Singapore; Herrin, J., Earth Observatory of Singapore, Nanyang Technological University, Singapore, 639798, Singapore; Jicha, B., Department of Geoscience, University of Wisconsin-Madison, Madison, WI 53706, United States; Angel, D.S., Earth Observatory of Singapore, Nanyang Technological University, Singapore, 639798, Singapore; Moore, J.D.P., Earth Observatory of Singapore, Nanyang Technological University, Singapore, 639798, Singapore; Banerjee, P., Earth Observatory of Singapore, Nanyang Technological University, Singapore, 639798, Singapore; Wiwegwin, W., Department of Mineral Resources, Ministry of Natural Resources and Environment, Ratchatewi, Bangkok, 10400, Thailand; Sihavong, V., Department of Geology and Mines, Ministry of Energy and Mines, Vientiane, Laos; Singer, B., Department of Geoscience, University of Wisconsin-Madison, Madison, WI 53706, United States; Chualaowanich, T., Department of Minera...
推荐引用方式 GB/T 7714	Sieh K.,Herrin J.,Jicha B.,et al. Australasian impact crater buried under the Bolaven volcanic field; Southern Laos[J],2020,117(3).
APA	Sieh K..,Herrin J..,Jicha B..,Angel D.S..,Moore J.D.P..,...&Charusiri P..(2020).Australasian impact crater buried under the Bolaven volcanic field; Southern Laos.Proceedings of the National Academy of Sciences of the United States of America,117(3).
MLA	Sieh K.,et al."Australasian impact crater buried under the Bolaven volcanic field; Southern Laos".Proceedings of the National Academy of Sciences of the United States of America 117.3(2020).