globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2021.117049
论文题名:
A 650 km2 Miocene strewnfield of splash-form impact glasses in the Atacama Desert, Chile
作者: Gattacceca J.; Devouard B.; Barrat J.-A.; Rochette P.; Balestrieri M.L.; Bigazzi G.; Ménard G.; Moustard F.; Dos Santos E.; Scorzelli R.; Valenzuela M.; Gounelle M.; Debaille V.; Beck P.; Bonal L.; Reynard B.; Warner M.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 569
语种: 英语
中文关键词: Atacama Desert ; impact glasses ; tektites
英文关键词: Fission products ; Fission reactions ; Geometry ; Iron ; Landforms ; Atacama Desert ; Glasses In ; High-temperature melting ; Hypervelocity impacts ; Impact craters ; Impact glass ; Impact process ; Impactors ; Miocene ; Tektite ; Glass ; aerodynamics ; ejecta ; fission track dating ; formation mechanism ; heterogeneity ; impact ; impact structure ; iron meteorite ; Miocene ; tektite ; water content ; Atacama Desert ; Chile ; Atacama
英文摘要: Glassy ejecta are associated to a limited number of impact craters, and yet hold key information about hypervelocity impact processes. Here we report on the discovery of a ∼650 km2 impact glass strewnfield in the Central Depression of the Atacama Desert. These cm-sized splash-form objects, that we refer to as atacamaites, are essentially composed of a dacitic glass formed by high-temperature melting of local magmatic rocks, with the addition of a variable iron meteorite contamination, 5 wt.% on average. The most likely nature for the impactor is the IIAB iron group. The fission-track plateau method, on two samples, yielded a mean formation age of 7.83±0.26 Ma. No associated impact crater has been discovered so far, suggesting it may be a relatively small, km-sized crater. The glassy nature, aerodynamic shapes, elevated formation temperature, and low water content are reminiscent of tektites. However, their small size, heterogeneity, oxidation state, significant contamination by the impactor, and likely more proximal provenance distinguish them from tektites. Atacamaites have no equivalent among the few known terrestrial ejected impact glasses, and increase the intriguing diversity of such products that we propose to name “tektoids”. © 2021 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165477
Appears in Collections:气候变化与战略

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作者单位: CNRS, Aix Marseille Univ, IRD, INRAE, CEREGE, Aix-en-Provence, 13545, France; Univ Brest, CNRS, IRD, Ifremer, LEMAR, Plouzané, F-29280, France; CNR, Institute of Geosciences and Earth Resources, Pisa, 56124, Italy; Instituto de Ciência e Tecnologia, Universidade Federal dos Vales do Jequitinhonha e Mucuri UFVJM, Diamantina, MG 39100-000, Brazil; Centro Brasileiro de Pesquisas Físicas, CBPF, Rio de Janeiro, RJ 22290-180, Brazil; Departamento de Ciencias Geológicas, Universidad Católica del Norte, Av. Angamos 0610, Antofagasta, Chile; Millennium Institute of Astrophysics, Av. Vicuña Mackenna, Macul, Santiago 4860, Chile; Muséum national d'Histoire naturelle, Sorbonne Universités, CNRS, IMPMC, Paris, 75005, France; Laboratoire G-Time, Université Libre de Bruxelles, Brussels, 1050, Belgium; Univ. Grenoble Alpes, CNRS, IPAG, Grenoble, 38400, France; Univ Lyon, ENSL, UCBL, CNRS, LGL-TPE, Lyon, 69342, France; NSF National Optical-Infrared Astronomy Research Laboratory, Avda Juan Cisternas, La Serena, 1500, Chile

Recommended Citation:
Gattacceca J.,Devouard B.,Barrat J.-A.,et al. A 650 km2 Miocene strewnfield of splash-form impact glasses in the Atacama Desert, Chile[J]. Earth and Planetary Science Letters,2021-01-01,569
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