dc.contributor.author |
Weber, Rachel Maria, 1975- |
|
dc.date.accessioned |
2011-11-30T00:09:51Z |
|
dc.date.available |
2011-11-30T00:09:51Z |
|
dc.date.issued |
2010-06 |
|
dc.identifier.uri |
http://hdl.handle.net/1794/11768 |
|
dc.description |
x, 86 p. : ill. A print copy of this thesis is available through the UO Libraries. Search the library catalog for the location and call number. |
en_US |
dc.description.abstract |
High-Mg basaltic andesites and andesites occur in the central
Trans-Mexican Volcanic Belt, primarily in the region south of Mexico
City, and their primitive chemical characteristics suggest equilibration
with mantle peridotite. These lavas may represent either slab melts that
re-equilibrated with peridotite during ascent or hydrous partial melts of a
peridotite source. I have experimentally mapped the liquidus mineralogy
for a high-Mg andesite from the Pelagatos cinder cone as a function of
temperature and H20 content over a range of mantle wedge pressures.
The results,concur with a published thermo barometer for peridotite
melting and suggest that this composition could only be in equilibrium
with a harzburgite residue at relatively high water contents and low
pressures and temperatures. However, numerically adjusting the composition fo r equilibrium with more refractory mantle (Fo92) shifts
these conditions to lower water content s and higher pressures and
temperatures near where geodynamic models indicate peak mantle
wedge temperatures. |
en_US |
dc.description.sponsorship |
Committee in charge: Dr. Paul J. Wallace, Chair;
Dr. A. Dana Johnston;
Dr. Eugene D. Humphreys |
en_US |
dc.language.iso |
en_US |
en_US |
dc.publisher |
University of Oregon |
en_US |
dc.relation.ispartofseries |
University of Oregon theses, Dept. of Geological Sciences, M.S., 2010; |
|
dc.subject |
Andesite -- Mexico -- Transverse Volcanic Range |
|
dc.subject |
Transverse Volcanic Range (Mexico) |
|
dc.title |
Experimental Insights into the Formation of High-Mg Andesites in the Trans-Mexican Volcanic Belt |
en_US |
dc.type |
Thesis |
en_US |