Arid
DOI10.1016/j.epsl.2017.04.009
Surface vitrification caused by natural fires in Late Pleistocene wetlands of the Atacama Desert
Roperch, Pierrick1; Gattacceca, Jerome2; Valenzuela, Millarca3; Devouard, Bertrand2; Lorand, Jean-Pierre4; Arriagada, Cesar5; Rochette, Pierre2; Latorre, Claudio6,7,8; Beck, Pierre9
通讯作者Roperch, Pierrick
来源期刊EARTH AND PLANETARY SCIENCE LETTERS
ISSN0012-821X
EISSN1385-013X
出版年2017
卷号469页码:15-26
英文摘要

We describe extended occurrences of unusual silicate glass surface layers from the Atacama Desert (Chile). These glasses, found near the town of Pica at four localities separated by up to 70 km, are neither fulgurites, nor volcanic glasses, nor metallurgical slags related to anthropic activity, but show close similarities to other glasses that have been previously attributed to large airbursts created by meteoroids entering the Earth’s atmosphere. The glasses are restricted to specific Late Pleistocene terrains: paleo-wetlands and soils rich in organic matter with SiO2-rich plant remains, salts and carbonates. C-14 dating and paleomagnetic data indicate that the glasses were formed during at least two distinct periods. This rules out the hypothesis of a single large airburst as the cause of surface melting. Instead, burning of organic-rich soils in dried-out grassy wetlands during climate oscillations between wet and dry periods can account for the formation of the Pica glasses. Large oases did indeed form in the hyperarid Atacama Desert due to elevated groundwater tables and increased surface discharge during the Central Andean Pluvial Event (roughly coeval with the Mystery interval and Younger Dryas). Finally, we discuss the implications of our results for the other surface glasses previously attributed to extraterrestrial events. (C) 2017 Elsevier B.V. All rights reserved.


英文关键词silicate glass airburst wetland pyrometamorphism Younger Dryas Atacama Desert
类型Article
语种英语
国家France ; Chile
收录类别SCI-E
WOS记录号WOS:000402444700002
WOS关键词SOUTHERN BOLIVIAN ALTIPLANO ; DRYAS IMPACT HYPOTHESIS ; GEOMAGNETIC-FIELD ; WESTERN DESERT ; HYPERARID CORE ; AERIAL BURSTS ; GLASS ; PALEOINTENSITY ; VOLCANISM ; DISCHARGE
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
来源机构French National Research Institute for Sustainable Development ; E17
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/198334
作者单位1.Univ Rennes 1, CNRS INSU, Geosci Rennes, Rennes, France;
2.Aix Marseille Univ, CNRS, IRD, Coll France,CEREGE, Aix En Provence, France;
3.Pontificia Univ Catolica Chile, Inst Astrofis, Ave Vicuna Mackenna 4860, Santiago, Chile;
4.Univ Nantes, CNRS UMR 6112, Lab Planetol & Geodynam, 2 Rue Houssiniere, F-44322 Nantes, France;
5.Univ Chile, Fac Ciencas Fis & Matemat, Dept Geol, Plaza Ercilla 803, Santiago, Chile;
6.Pontificia Univ Catolica Chile, Ctr UC Desierto Atacama, Alameda 340, Santiago, Chile;
7.Pontificia Univ Catolica Chile, Dept Ecol, Alameda 340, Santiago, Chile;
8.IEB, Santiago, Chile;
9.IPAG, 414,Rue Piscine,Domaine Univ, F-38400 St Martin Dheres, France
推荐引用方式
GB/T 7714
Roperch, Pierrick,Gattacceca, Jerome,Valenzuela, Millarca,et al. Surface vitrification caused by natural fires in Late Pleistocene wetlands of the Atacama Desert[J]. French National Research Institute for Sustainable Development, E17,2017,469:15-26.
APA Roperch, Pierrick.,Gattacceca, Jerome.,Valenzuela, Millarca.,Devouard, Bertrand.,Lorand, Jean-Pierre.,...&Beck, Pierre.(2017).Surface vitrification caused by natural fires in Late Pleistocene wetlands of the Atacama Desert.EARTH AND PLANETARY SCIENCE LETTERS,469,15-26.
MLA Roperch, Pierrick,et al."Surface vitrification caused by natural fires in Late Pleistocene wetlands of the Atacama Desert".EARTH AND PLANETARY SCIENCE LETTERS 469(2017):15-26.
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