Publication Date

1983

Document Type

Dissertation/Thesis

First Advisor

McGinnis, Lyle D. (Lyle David), 1931-2017

Degree Name

M.S. (Master of Science)

Legacy Department

Department of Geology

LCSH

Geology--Antarctica--McMurdo Sound

Abstract

Results of several reversed refraction profiles and a gravity profile were used in the crustal modelling beneath McMurdo Sound. A depth to the Moho surface of 21 km was calculated from a 195.7 km refraction profile shot subparallel to the strike of the Transantarctic Mountains. Gravity modelling shows the subducted Moho surface to descend beneath the Transantarctic Mountains. Refraction data were used to construct a basement structure map, isopach maps of various sedimentary layers, and two geologic profiles. Trough-like depressions in the basement surface and overlying sediment layer surfaces are found to extend from the major valleys of the Dry Valley system, suggesting similar origins. Formation of these linear depressions were probably the result of block faulting and/or glacial scour. Thickening of the sedimentary layer*s overlying layer surface depressions may indicate the formation of these depressions before the infilling of sediments.

Comments

Bibliography: pages 45-50.

Extent

viii, 197 pages

Language

eng

Publisher

Northern Illinois University

Rights Statement

In Copyright

Rights Statement 2

NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

Media Type

Text

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