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Présence de ponces dans les éruptions de janvier 1987 au Pacaya (Guatémala)

Other titlePumice bearing lavas from the January 1987 Pacaya eruption
First online date1989
Abstract

The Pacaya is one of the many volcanoes forminb the Coastal Range of Guatemala resulting from the subduction of the Pacific Plate under the American Plates. During its January 1987 eruption, the Pacaya produced large bombs, many of thes having a pseudo-pumice core of dacitic composition. A potassium-argon dating of this pumice yields an age of 25 M.a. The most probable origin of the cores is to be found in the volcano-sedimentary basement of the Pacaya, rather than regarding them as transformed diatomites.

freeng
NoteNote présentée par Maurice Roques
Citation (ISO format)
BECHON, France et al. Présence de ponces dans les éruptions de janvier 1987 au Pacaya (Guatémala). In: [Comptes rendus des séances de l’Académie des sciences Série 2, Mécanique, Physique, Chimie, Sciences de la Terre, Sciences de l’univers], 1989, vol. 309, p. 1203–1206.
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Article (Published version)
accessLevelPublic
Identifiers
  • PID : unige:155192
ISSN of the journal0249-6305
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59downloads

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