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When ignimbrite meets water; megascale gas-escape structures formed during welding

Peter W. Lipman
When ignimbrite meets water; megascale gas-escape structures formed during welding
Geology (Boulder) (December 2018) 47 (1): 63-66

Abstract

Diverse welding, crystallization, and structural features develop when a hot ignimbrite encounters external water, depending largely on volatile-rock ratios. Such processes are spectacularly documented by a regional ignimbrite where it ponded within an older caldera in the San Juan Mountains, Colorado (USA). Interaction of hot pyroclastic flows with moist underlying sediments or standing water in a stream valley or shallow-lakeshore environment produced megascale gas-escape structures, quenched adjacent tuff, inhibited welding, and generated nonplanar crystallization zones. This site provides a context for reviewing examples of ignimbrite-water interaction elsewhere.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 47
Serial Issue: 1
Title: When ignimbrite meets water; megascale gas-escape structures formed during welding
Author(s): Lipman, Peter W.
Affiliation: U. S. Geological Survey, Volcano Science Center, Menlo Park, CA, United States
Pages: 63-66
Published: 20181207
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 24
Accession Number: 2019-007034
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: GSA Data Repository item 2019026
Illustration Description: illus. incl. geol. sketch map
N37°58'60" - N37°58'60", W106°42'00" - W106°42'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201906
Program Name: USGSOPNon-USGS publications with USGS authors
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