Rheological controls on the emplacement of extremely high-grade ignimbrites

Extremely high-grade, lava-like welded ignimbrites are produced by many large explosive eruptions with volumes typically 101-103 km3. However, understanding of the physical properties of these unusual deposits, and their transport and depositional mechanisms, is incomplete. The lava-like and rheomor...

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Bibliographic Details
Published in:Geology (Boulder) 2013-09, Vol.41 (9), p.1031-1034
Main Authors: Robert, Genevieve, Andrews, Graham D. M, Ye, Jiyang, Whittington, Alan G
Format: Article
Language:English
Subjects:
Cenozoic
Deborah number
Deformation
Density
Deposition
ductile deformation
emplacement
experimental studies
Explosive welding
Geology
Grey's Landing Ignimbrite
Heating
high-grade metamorphism
Idaho
igneous and metamorphic rocks
igneous rocks
ignimbrite
laboratory studies
metamorphism
Miocene
Neogene
one-dimensional models
Petrology
Physical properties
pyroclastics
Rheological properties
rheology
Rogerson Formation
Shear zone
Snake River plain
Strain
Strain rate
Temperature
Tertiary
tuff
United States
viscosity
volcanic rocks
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Summary:Extremely high-grade, lava-like welded ignimbrites are produced by many large explosive eruptions with volumes typically 101-103 km3. However, understanding of the physical properties of these unusual deposits, and their transport and depositional mechanisms, is incomplete. The lava-like and rheomorphic Grey's Landing ignimbrite, Idaho (western United States), provides abundant field evidence supporting the upward migration of a transient,
ISSN:0091-7613
1943-2682
DOI:10.1130/G34519.1