Volcano List
About Alaska's Volcanoes Hazards from Alaska's Volcanoes
Map & Alphabetical List Interactive Map
Eruption Search Volcano Search
|
Text Description: Breccia, altered matrix with small pebbles. Blocks are up to 30 cm^3. Blocks are either vesicular and aphyric or with large equant plag xtals (pheno or clot flow?). Could this be remnant of T-vent collapse? 3 pieces of breccia, one with matrix and pheno-rich clast, 2 other pieces of pheno-poor clasts. References:  Volcanism on Unimak Island, Alaska, USA: a special focus on Shishaldin and Fisher volcanoes |
This website is supported by the U.S. Geological Survey under Cooperative Agreement Grant G22AC00137
Mention of trade names or commercial products does not constitute their endorsement by the U.S. Geological Survey.
Operations
Response
Staff
Fields of Study
Geology
Color Code Definitions
Webcams
Webicorders
RSAM
Great Sitkin
Trident
Glossary
Recent Images
Browse Images
