Award Date
1-1-1989
Degree Type
Thesis
Degree Name
Master of Science (MS)
Department
Geoscience
First Committee Member
E. I. Smith
Number of Pages
77
Abstract
Geochemical, isotopic, paleomagnetic, and geochronological studies of Late Miocene to Pliocene alkalic basalt in the upper Grand Wash Trough, Arizona and at Gold Butte, Nevada may place constraints on the petrogenetic history of the basalt and on the geometry of the crustal structures that may have served as conduits; Geochemical modelling suggests that type B basalt can be derived from independent batch melts of spinel peridotite with limited fractionation (5 to 9% olivine plus Fe-Ti oxide); The Sr, Nd and Pb isotopic data confirm the geochemical models and indicate that all three magma types are mantle derived; The restricted range in geochemical diversity, the lack of extensive fractionation suggested by geochemical modelling, combined with a similarity of paleomagnetic poles and a lack of paleosols or uncomformities in the flow stacks of type B basalt flows, suggests that the eruptive episode for type B lavas was short lived. (Abstract shortened with permission of author.).
Keywords
Alkalic; Arizona; Basalt; Basin; Boundary; Cenozoic; Eastern; Petrogenesis; Range; Grand Wash Trough; Gold Butte; Nevada
Controlled Subject
Geology
File Format
File Size
3031.04 KB
Degree Grantor
University of Nevada, Las Vegas
Language
English
Permissions
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Repository Citation
Cole, Erin D, "Petrogenesis of Late Cenozoic alkalic basalt near the eastern boundary of the Basin-and-Range: Upper Grand Wash Trough, Arizona and Gold Butte, Nevada" (1989). UNLV Retrospective Theses & Dissertations. 45.
http://dx.doi.org/10.25669/uilu-4lw7
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