globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1904368116
论文题名:
Australasian impact crater buried under the Bolaven volcanic field; Southern Laos
作者: 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.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期:3
起始页码: 1346
结束页码: 1353
语种: 英语
英文关键词: Australasian ; Crater ; Impact ; Lao ; Tektite
Scopus关键词: iridium ; Article ; astronomy ; crater ; geochemical analysis ; geochemistry ; gravity ; Laos ; priority journal ; sediment ; volcano
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163501
Appears in Collections:气候变化与战略

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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 Mineral Resources, Ministry of Natural Resources and Environment, Ratchatewi, Bangkok, 10400, Thailand; Charusiri, P., Department of Geology, Chulalongkorn University, Khet Pathumwan, Bangkok, 10330, Thailand

Recommended Citation:
Sieh K.,Herrin J.,Jicha B.,et al. Australasian impact crater buried under the Bolaven volcanic field; Southern Laos[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(3)
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