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

Marta Lucia Calvache V. and Stanley N. Williams
Lithic-dominated pyroclastic flows at Galeras Volcano, Colombia; an unrecognized volcanic hazard
Geology (Boulder) (June 1992) 20 (6): 539-542

Abstract

Yellow, hydrothermally altered, lithic-dominated pyroclastic breccia deposits, having only a minor juvenile component, at Galeras volcano, Colombia, 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. Recognition of the mode of origin of these deposits is important in terms of understanding Vulcanian-type eruption and flow- emplacement mechanisms. Failure to recognize the explosive eruption origin of these deposits at Galeras and other volcanoes could result in serious underestimation of potential hazards.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 20
Serial Issue: 6
Title: Lithic-dominated pyroclastic flows at Galeras Volcano, Colombia; an unrecognized volcanic hazard
Affiliation: Ariz. State Univ., Dep. Geol., Tempe, AZ, United States
Pages: 539-542
Published: 199206
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 28
Accession Number: 1992-034405
Categories: Igneous and metamorphic petrologyEnvironmental geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch map
N01°13'60" - N01°13'60", W77°22'00" - W77°22'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1992
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