Award Date

1-1-1991

Degree Type

Thesis

Degree Name

Master of Science (MS)

Department

Geoscience

First Committee Member

Eugene I. Smith

Number of Pages

190

Abstract

The west-dipping Cyclopic-Salt Spring Wash-Lakeside Mine fault system marks the easternmost boundary of the extensional allochthon in the Basin and Range Province and the eastern limit of exposure of mid-Tertiary igneous rocks at the latitude of Lake Mead. The upper plate of this fault system is exposed only in the northern White Hills, Mohave County, Arizona. The upper plate contains east-tilted mid-Tertiary volcanic and sedimentary rocks, cut by down-to-the-west normal faults; Mafic volcanic rocks were erupted from three coeval Miocene volcanic centers. Three distinct types of mafic magma suggest similar degrees of partial melting of different K-rich sources. Each magma type evolved by fractionation in conjunction with periodic recharge by new batch melts. The volcanic section is correlated with Miocene volcanic sections in the Eldorado and Black Mountains on the basis of stratigraphic position, geochemistry and petrography.

Keywords

Arizona; Basin; County; Eastern; Extensional; Mohave; Northern; Province; Range; Style; Tectonic; Volcanism

Controlled Subject

Geology

File Format

pdf

File Size

12390.4 KB

Degree Grantor

University of Nevada, Las Vegas

Language

English

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