Abstract/Details

Postcollapse volcanism in the Valles Caldera, New Mexico: The transition from large volume explosive to small volume effusive eruptions


2007 2007

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Abstract (summary)

Deer Canyon, Redondo Creek, and Del Medio rhyolites were erupted in the Valles Caldera within 54 ka following caldera collapse. Postcollapse rhyolites and Bandelier Tuff magmas are compositionally distinct, and Deer Canyon is heterogeneous between individual flows. 238U/206Pb zircon dating shows that Redondo Creek zircons were derived from the residual Bandelier Tuff crystal mush system whereas Deer Canyon zircons were derived from remelting of a pluton at depth. Electron microprobe analyses of feldspars reveal complex zonation caused by interactions between mafic magmas and silicic melts of residual crystal mush as well as between distinct melts from the crystal mush. Each postcollapse rhyolite was produced by independent melting events in the residual Bandelier Tuff crystal mush, interactions between these melts and heat-providing mafic magmas, and magma arriving from deeper in the crust. They are not comagmatic with each other, nor with the preceding Bandelier Tuff magmas.

Indexing (details)


Subject
Geology;
Mineralogy;
Geochemistry
Classification
0372: Geology
0411: Mineralogy
0996: Geochemistry
Identifier / keyword
Earth sciences
Title
Postcollapse volcanism in the Valles Caldera, New Mexico: The transition from large volume explosive to small volume effusive eruptions
Author
Gibler, Kati
Number of pages
195
Publication year
2007
Degree date
2007
School code
0506
Source
MAI 46/02M, Masters Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780549240600
Advisor
Hanson, Andrew
University/institution
University of Nevada, Las Vegas
University location
United States -- Nevada
Degree
M.S.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
1448398
ProQuest document ID
304755607
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/304755607
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