Publication Date

1-1-1990

Document Type

Dissertation/Thesis

First Advisor

Walker, James Allen, 1952-

Degree Name

B.S. (Bachelor of Science)

Legacy Department

Department of Geology and Environmental Geosciences

Abstract

In the Transition zone of southwestern Utah, basaltic lavas are geochemically defined as a subduction suite and a plume suite. These predominantly basic lavas are late Cenozoic (<17 Ma) in age, with the two suites related in time and space. This paper suggests a two layer upper mantle model, an upper metasomatized lithospheric layer underlain by an asthenospheric layer, with both alkali basaltic and olivine tholeiitic magmas being generated by varying degrees of partial melting of spinel lherzolite in each individual layer. Due to the greater depth at which asthenospheric magmas are derived, mixing occurs between the alkali basaltic and the olivine tholeiitic magmas during ascent through the lithosphere. Since lithosphere-derived magmas ascend to the crust soon after generation, significantly less mixing occurs, if at all. Time-space relations support such a model.

Comments

Includes bibliographical references.

Extent

27 pages

Language

eng

Publisher

Northern Illinois University

Rights Statement

In Copyright

Rights Statement 2

NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

Media Type

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