Doctoral Dissertations

Abstract

"The dissertation area lies on the western flank of the Ozark uplift between Lebanon and Camdenton, Missouri. In the northwestern corner of the study area a portion of the Decaturville cryptoexplosive structure is exposed. The dominant structure outside the disturbed zone is a northwest-trending asymmetrical anticline with a subsidiary normal fault dipping southwest on the steeper southwest limb.

The area is mapped in considerable detail in order to describe subtle structural features. To overcome a problem of poor exposures, new key beds are defined which greatly increase structural control. Significant structures recognized as a result are the Dry Auglaize anticline, the Dry Auglaize fault and the outer acruate anticline and syncline of the Decaturville structure.

Interesting aeromagnetic anomalies occur in the study area. Pre- cambrian topography inadequately explains the dominant magnetic anomaly. The origin of this anomaly is considered to be a plate roughly 2,300 feet thick with the susceptibility of diorite on the upthrown side of the Dry Auglaize fault zone.

The Decaturville structure is an astrobleme. It has no clear relationship to regional structure, exhibits a circular symmetry, and shows a unique style of brecciation and internal structures that are difficult to reconcile by normal tectonic means. Other corroborative evidence is the presence of shatter cones, crystal lattice degradation, and the absence of volcanic rock"--Abstract, page iii.

Advisor(s)

Spreng, Alfred C., 1923-2012

Committee Member(s)

Gentile, Richard J.
Beveridge, Thomas R. (Thomas Robinson), 1918-1978
Grant, S. Kerry
Proctor, Paul Dean, 1918-1999

Department(s)

Geosciences and Geological and Petroleum Engineering

Degree Name

Ph. D. in Geology

Comments

Three plates, folded in the back pocket of the manuscript, are provided here as supplemental files. Due to their large size, these files may take more time to download.

Publisher

University of Missouri--Rolla

Publication Date

1977

Pagination

vii, 140 pages

Note about bibliography

Includes bibliographical references (pages 116-123).

Geographic Coverage

Stoutland, Missouri

Rights

© 1977 Chester Encell Nichols, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Thesis Number

T 4260

Print OCLC #

5995641

Nichols_Plate_1.tif (324518 kB)
Areal Geology

Nichols_Plate_2.tif (326238 kB)
Structure

Nichols_Plate_3.tif (219781 kB)
Aeromagnetic Contour Map

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Geology Commons

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