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Volcanic and magmatic evolution of a small trachytic vent complex, north Burro Mesa, Big Bend National Park, Texas

Abstracts with Programs

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Abstract

Volcanic rocks exposed on the northern end of Burro Mesa in Big Bend National Park portray the evolution of an Oligocene central volcanic vent complex that produced two generations of welded block and ash deposits associated with 1) initial dome collapse and 2) subsequent central spine collapse. Peripheral to the vent complex, isolated breccia deposit exposures overlie ignimbrites, tephras, and lavas. These blocks are a few meters to several hundred meters long and 30 m high and consist of monolithic angular and welded trachytic lava clasts in finer-grained matrix. Rheomorphic structures in the breccia deposit show ductile deformation and suggest it formed while above the glass transition temperature.

Geospatial Extents

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Volcanic and magmatic evolution of a small trachytic vent complex, north Burro Mesa, Big Bend National Park, Texas
Series title:
Abstracts with Programs
Volume
41
Issue:
7
Year Published:
2009
Language:
English
Publisher:
Geological Society of America
Contributing office(s):
Central Mineral and Environmental Resources Science Center
Description:
1 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Abstracts with Programs
First page:
366
Last page:
366
Country:
United States
State:
Texas
Other Geospatial:
Burro Mesa;Big Bend National Park