Masters Theses

Abstract

"Careful petrographic study of the ash-flow tuffs in the Indian Peak District of southwestern Utah reveals hydrothermal alteration around the fluorite veins. The alteration minerals themselves and the intensity of alteration vary with distance from the veins. Primary plagioclase has altered to secondary feldspar, calcite, sericite, and traces of epidote and zoisite. Hornblende and biotite have altered to chlorite, calcite, and secondary iron oxide, and traces of epidote and zoisite. Diopside has changed to calcite and secondary iron oxide. An overall picture of the mining district shows that certain minerals increase and others decrease as one nears the veins. Hydrothermal quartz veins and veinlets increase in concentration toward the veins. Epidote and zoisite appear only in trace and small amounts and have no particular trend of concentration. Sericite generally increases toward the vein, but decreases immediately adjacent to it. Secondary feldspar varies very little until immediately near the veins, it decreases, as sericite does. Chlorite generally increases away from the vein. Secondary iron oxide occurs only in small amounts and seems to have no particular general trend. Calcite appears to increase away from the vein. Hydromuscovite appears only near the veins. The primary mineral content decreases toward the veins"--Abstract, page ii.

Advisor(s)

Grant, S. Kerry

Committee Member(s)

Hagni, Richard D.
Day, D. E.

Department(s)

Geosciences and Geological and Petroleum Engineering

Degree Name

M.S. in Geology

Sponsor(s)

V. H. McNutt Memorial Foundation

Publisher

University of Missouri--Rolla

Publication Date

1971

Pagination

ix, 87 pages

Note about bibliography

Includes bibliographical references (pages 109-110).

Geographic Coverage

Utah

Rights

© 1971 Michael Allan Tolley, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Subject Headings

Volcanic ash, tuff, etc. -- Utah
Hydrothermal alteration -- Utah
Fluorspar -- Analysis

Thesis Number

T 2578

Print OCLC #

6034337

Electronic OCLC #

873597832

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