Award Date

1-1-1988

Degree Type

Thesis

Degree Name

Master of Science (MS)

Department

Geoscience

First Committee Member

E. I. Smith

Number of Pages

107

Abstract

The Wilson Ridge pluton is an epizonal calc-alkaline pluton that formed about 13.5 Ma during a period of mid-Miocene extension. The pluton was passively emplaced into a 1.7 to 1.8 Ga Precambrian crystalline terrain. High-angle normal faulting resulted in a series of horsts and grabens that provide windows into deep structural levels of the pluton; The Wilson Ridge pluton is composed of the Teakettle Pass suite, comprised of foliated monzodiorite and quartz monzodiorite, and unfoliated quartz monzonite; and the older Horsethief Canyon diorite; Intermediate rocks of the Teakettle Pass suite contain abundant basalt and diorite enclaves; Field evidence and major and trace element models suggests that the intermediate rocks of the pluton were produced by the commingling of a large volume of mafic magma with a smaller volume of felsic magma (a mafic-felsic ratio of about 70:30) as well as fractional crystallization. Similar open system processes may be responsible for the production of calc-alkaline intermediate rocks in other parts of the Great Basin. (Abstract shortened with permission of author.).

Keywords

Alkaline; Arizona; Calc; Enclaves; Environment; Extensional; Generation; Implications; Intermediate; Northwestern; Origin; Pluton; Ridge; Wilson

Controlled Subject

Geology; Geophysics

File Format

pdf

File Size

9175.04 KB

Degree Grantor

University of Nevada, Las Vegas

Language

English

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