Widespread Allerod and Boreal trachyandesitic to trachytic tephra layers as stratigraphical markers in the Massif Central, France

E. H. Juvigne, S. B. Kroonenberg, A. Veldkamp, A. El Arabi, G. Vernet

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Abstract

A widespread trachyandesitic tephra deposit of Allerod age occurs in the eastern Limagne Rift valley and in the adjacent Forez Mountains. It is called the Ravel Tephra and was produced by the La Nugere volcano around 11 4000 BP. Microprobe analyses show it to be characterized by aluminous diopside and labradorite. Its lobe is directed towards the SE. The Ravel Tephra may be distinguished from another trachyandesitic tephra layer of Allerod age found in the Cezallier and in the Monts Dore, because the latter has more basic plagioclase, and is about 900 yr younger. At Gerzat, the Ravel Tephra is overlain successively by a thin lacustrine deposit, a trachytic tephra lamina, and another trachyandesitic tephra bed. The trachytic lamina is correlated with the La Taphanel Tephra, which is supposed to be a mixture of the coeval tephras erupted by the Chopine, Kilian and Vasset volcanoes. A trachyandesitic tephra overlying the La Taphanel Tephra, is attributed to the "Nouveau Pariou' volcano. A common age of about 8500 BP is proposed for the trachytic tephra sheets and the trachyandesitic Pariou tephra. -Authors

Original languageEnglish
Pages (from-to)137-146
Number of pages10
JournalQuaternaire
Volume3
Issue number3-4
DOIs
Publication statusPublished - 1 Jan 1992
Externally publishedYes

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