A cryptotephra from the Upper Pleistocene volcanism of the Bas-Vivarais in the sedimentary infilling of the Chauvet-Pont d’Arc cave (Ardèche, France)

IF 2 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Comptes Rendus Geoscience Pub Date : 2021-05-04 DOI:10.5802/CRGEOS.52

J. Pastre, É. Debard, Catherine Ferrier, M. Fialin, B. Gély, Bertrand Kervazo, Frédéric Maksud, F. Mokadem, S. Nomade, N. Rividi, Ségolène Saulnier-Copard

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引用次数: 1

Abstract

A cryptotephra belonging to the Upper Pleistocene volcanism of the Bas-Vivarais was identified for the first time in the sedimentary infilling of the entrance area of the Chauvet-Pont d’Arc cave. This slightly reworked tephra fall is characterized by its heavy minerals assemblage, among which magnesian olivine, enstatite, and chromian diopside issued from peridotites and olivine and diopside of basaltic origin. This composition likely refers to a phreatomagmatic eruption of a maar crater. The 14C datings of the cryptotephra beds are contemporaneous with the Aurignacian settlement and paintings, that is, an age slightly older or close to 36 ka. Among the maar craters from the Bas-Vivarais, the Ray-Pic maar have the closest 40Ar/39Ar age (36.2±11.3/32.2±11.1 ka). By contrast, the Vestide du Pal, the biggest maar crater of this country, seems to have a younger age, but the 40Ar/39Ar dating was measured on a basalt which could have occurred later and been the source of the tephra fall, since its tephras contain the same minerals of unknown origin as those found in Chauvet cave. This discovery strengthens the previous hypothesis according to which the humans living in the Chauvet-Pont d’Arc area during the Upper Paleolithic have witnessed eruptions from the Bas-Vivarais volcanic field and

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下维瓦莱地区上更新世火山活动中的一种隐孢子虫(法国ard区)

在Chauvet-Pont d’arc岩洞入口的沉积充填中，首次发现了下维瓦莱地区上更新世火山活动的隐层。这片经过轻微改造的毛毡落具有重矿物组合的特点，其中镁质橄榄石、顽辉石、铬质透辉石来自橄榄岩，而橄榄石和透辉石则来自玄武岩。这种成分可能是指一个maar火山口的呼吸岩浆喷发。隐毯层的14C测年与奥里尼亚纪的聚落和绘画是同时期的，即年龄稍早或接近36ka。其中，Ray-Pic陨石坑具有最接近的40Ar/39Ar年龄(36.2±11.3/32.2±11.1 ka)。相比之下，这个国家最大的马尔陨石坑Vestide du Pal似乎有一个更年轻的年龄，但40Ar/39Ar的年代测定是在玄武岩上进行的，该玄武岩可能是后来发生的，并且是tephra坠落的来源，因为它的tephras含有与Chauvet洞穴中发现的相同的未知来源的矿物质。这一发现加强了先前的假设，即旧石器时代晚期生活在肖韦-阿克桥地区的人类目睹了下维瓦莱火山场和火山喷发

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来源期刊

Comptes Rendus Geoscience 地学-地球科学综合

CiteScore

2.80

自引率

14.30%

发文量

审稿时长

5.9 weeks

期刊介绍： Created in 1835 by physicist François Arago, then Permanent Secretary, the journal Comptes Rendus de l''Académie des sciences allows researchers to quickly make their work known to the international scientific community. It is divided into seven titles covering the range of scientific research fields: Mathematics, Mechanics, Chemistry, Biology, Geoscience, Physics and Palevol. Each series is led by an editor-in-chief assisted by an editorial committee. Submitted articles are reviewed by two scientists with recognized competence in the field concerned. They can be notes, announcing significant new results, as well as review articles, allowing for a fine-tuning, or even proceedings of symposia and other thematic issues, under the direction of invited editors, French or foreign.