Masters Theses

Abstract

"Diagenesis designates all modifications which a sediment undergoes during and following deposition and prior to complete lithification, metamorphism, deep burial, and orogenesis.

Probably the dolomites of the Jefferson City Formation resulted from alteration at, or below the sea floor or the depositional interface and during diagenesis. Diagenetic dolomitization or penecontemporaneous alteration presumably involves a reaction between the calcium carbonate sediments at/or below the sea floor or the depositional interface and magnesium salts in solution or suspension in the basal layer of contacting sea water, or in the initial pr connate water trapped in the sediment.

The cherts of the Jefferson City Formation are believed to have originated with the original sediments. Euhedral dolomite crystals, dolomolds, and pyrite grains in the chert, and the concentric banding of the cherts suggests a penecontemporaneous origin. The pyrite of the Jefferson City Formation probably resulted from the reduction of sulphates below the base of the sea floor, or the depositional interface, during diagenesis. The authigenic formation of pyrite during diagenesis involves the formation of hydrotroilite first, and the subsequent modification to pyrite, during compaction, via melnikovite secondly.

The formation of dolomite, in particular, and the formation of chert and pyrite, as well, during diagenesis is favored by a shallow marine environment. Such an environment, i. e., a shallow, marine, open-sea, predominantly intermittently agitated environment, was established for the Jefferson City Formation"--Abstract, p. xiii

Advisor(s)

Proctor, Paul Dean, 1918-1999

Committee Member(s)

Morgan, Ray E., 1908-1997
Rupert, Gerald B., 1930-2016
Ash, Richard L.

Department(s)

Geosciences and Geological and Petroleum Engineering

Degree Name

M.S. in Geology

Publisher

Missouri School of Mines and Metallurgy

Publication Date

1963

Pagination

xiii, 264 pages

Note about bibliography

Includes bibliographical references (pages 254-263)

Rights

© 1963 Erik Hans Schot, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Thesis Number

T 1544

Print OCLC #

5954996

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