Masters Theses

Abstract

"Petrographic, petrochemical and spectrographic studies were completed on selected Precambrian granitic rock samples from Southeastern Missouri. This investigation contributes to a more detailed knowledge of the Precambrian granitic rocks of this part of the state.

Petrographic analysis of forty-four thin sections of granitic rocks from the St. Francois Mountains area revealed six different granite types. These have been named the Fredericktown, Knoblick, Doerun, Graniteville, Klondike and Silvermine granites. These rocks form a large part of a composite batholith. More than one period of granitic intrusion is represented, but differentiation also contributed to the formation of this diversity of the rocks. In the Johannsen classification they are classified as leucogranites, granites, alaskites, kalialaskites, sodaclase granites and adamellites.

The Niggli petrochemical classification of twenty- seven chemical analyses of these granites revealed their petrogenetic relationships. The chemical character of the magma out of which they have formed was acidic, salic, relatively alkali rich and lime poor. The Doerun, Graniteville and Klondike granites are in the aplitgranitic, the Fredericktown granites and granite porphyries in the aplitgranitic and engadinitgranitic, the Knoblick granite in the granodioritic, and the Silvermine granite in the yosemititgranitic magma type. All the rocks belong to the calc-alkalic petrographic province.

Qualitative spectrochemical analysis of forty-four granite samples revealed the presence of the following minor elements: Mg, Sr, Ba, Ti, Zr, V, Cr, Co, Ni, Cu, Ag, Zn, Sn and Pb. Mg, V, Co, Zn, Sn and Pb were selected as index trace elements. The different granite types were characterized according to the relative amounts of these. The Fredericktown granites and granite porphyries, the Knoblick granite and the Silvermine granite contain more Mg, V, and Co, and less Zn, Sn, and Pb than the other granite types. The Doerun, Graniteville and Klondike granites are also relatively high in V and Co. Zn is not always present, but they have more Sn and Pb than the other granite types. Compared with granites from other localities, the Missouri granites are characterized by a consistency of copper, a relatively frequent occurrence of tin, lead and zinc, and a rareness of chromium and silver"--Abstract, pages ii-iii.

Advisor(s)

Proctor, Paul Dean, 1918-1999

Committee Member(s)

James, William Joseph
Kennedy, Richard Ray
James, William Joseph

Department(s)

Geosciences and Geological and Petroleum Engineering

Degree Name

M.S. in Geology

Publisher

Missouri School of Mines and Metallurgy

Publication Date

1960

Pagination

x, 129 pages, 17 plates

Note about bibliography

Includes bibliographical references (pages 126-128).

Geographic Coverage

Missouri

Time Period

Precambrian

Rights

© 1960 Eva Bognar Kisvarsanyi, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Library of Congress Subject Headings

Geology -- Missouri
Geology, Stratigraphic -- Precambrian
Granite

Thesis Number

T 1252

Print OCLC #

5928597

Electronic OCLC #

957593298

Comments

In between pages 8 and 10 are a set of overlays. Overlay #1, Overlay #2, and Figure 2 are shown individually and in combination (Figure 2 with overlay 1, Figure 2 with overlay 2, Figure 2 with overlay 1 and 2).

Included in

Geology Commons

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Thesis Location

 
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