Doctoral Dissertations

Abstract

"The Boss iron-copper deposit is the only deposit of the Southeast Missouri Iron Metallogenic Province known to contain appreciable copper sulfide mineralization. Major lithologies of Boss West Dome were characterized by petrologic, petrographic and geochemical methods. Previous lithologic classifications inaccurately characterized numerous rock units. Alteration assemblages at West Dome were also characterized and described; those assemblages had not previously been defined. Comparisons of West Dome to other deposits in the Southeast Missouri Iron Metallogenic Province and in the Gawler Province, South Australia, as well as to criteria set forth for Olympic Dam-type deposits, clearly places Boss West Dome in this family of iron-copper-gold deposits.

Rhyolites are the earliest lithology, and they are associated with a proposed collapsed caldera complex. Trachytes represent a shallow intrusive that post-dates the rhyolites. Both lithologies exhibit potassium enrichments and secondary quartz emplacement related to a potassic alteration assemblage. A Rb-Sr isotope date of 1.136 Ga ± 0.170 Ga may represent the potassic alteration event. Granitic dikes post-date rhyolites and trachytes. The dikes lack potassium enrichment, suggesting that they were in equilibrium with, or post-dated, potassium alteration.

Propylitic, phyllic and hematitic assemblages altered rhyolites, trachytes and granites. Assay values for propylitized core suggest that sulfur associated with this alteration assemblage resulted in additional chalcopyrite mineralization. The phyllic alteration assemblage is one of the most extensive present at West Dome. The extent is unusual in the province. Hematitic alteration may be related to the previously noted assemblages. The assemblages suggest that the Boss deposit formed at shallow depths"--Abstract, page iii.

Advisor(s)

Hagni, Richard D.

Committee Member(s)

Gregg, Jay M.
Laudon, Robert C.
Oboh-Ikuenobe, Francisca
Miller, F. Scott, 1956-

Department(s)

Geosciences and Geological and Petroleum Engineering

Degree Name

Ph. D. in Geology and Geophysics

Publisher

University of Missouri--Rolla

Publication Date

Spring 2003

Pagination

xv, 139 pages

Note about bibliography

Includes bibliographical references (pages 127-138).

Geographic Coverage

Iron County (Mo.)
Dent County (Mo.)

Rights

© 2003 Cheryl Marie Seeger, All rights reserved.

Document Type

Dissertation - Restricted Access

File Type

text

Language

English

Library of Congress Subject Headings

Geology -- Missouri -- Iron County
Geology -- Missouri -- Dent County
Petrology -- Missouri -- Iron County
Petrology -- Missouri -- Dent County

Thesis Number

T 8278

Print OCLC #

53959987

Electronic OCLC #

905907197

Link to Catalog Record

Electronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.

http://laurel.lso.missouri.edu/record=b5037534~S5

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