Lithic-dominated pyroclastic flows at Galeras volcano, Colombia - an unrecognized volcanic hazard

M. L. Calvache V., Stanley Williams

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

Yellow, hydrothermally altered, lithic-dominated pyroclastic breccia deposits, having only a minor juvenile component contain evidence that they were emplaced as hot, fluidized, true pyroclastic flows. The distribution of the flows around the caldera rim, their transport mechanisms inferred from grain-size analyses, and the presence of charcoal and coarse channel and fine overbank facies indicate that these deposits were emplaced as true pyroclastic flows. These deposits are the result of a regularly repeated eruption sequence, involving clearing of vent material as a prelude to more typical pumiceous pyroclastic flows. -from Authors

Original languageEnglish (US)
Pages (from-to)539-542
Number of pages4
JournalGeology
Volume20
Issue number6
DOIs
StatePublished - Jan 1 1992

ASJC Scopus subject areas

  • Geology

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