Electronic Theses and Dissertations

Identifier

771

Date

2012

Date of Award

11-29-2012

Document Type

Thesis

Degree Name

Master of Science

Major

Earth Sciences

Concentration

Geology

Committee Chair

Mervin J. Bartholomew

Abstract

Paleoseismites occur throughout the Campanian package exposed in the Elk Basin anticline. Within marine units convolute-bedding typically involves single sandstone beds with vertical to overturned strata on either side of a near-vertical vent, whereas the non-marine Eagle Formation contains planar clastic dikes derived from liquefied sand-source beds. Liquefied sand was injected upward and laterally across mudstone and/or coal along pre-existing planar, near-vertical, near-surface joints. Orientations of 145 sandstone-dikes were compared with 61 previously reported Laramide joint-orientations. Although dike- and joint-trends are similar, dikes preferentially fill cross-joints whereas strike-joints are the dominant later Laramide joint-set. Dike orientations are consistent with their formation during earliest Laramide deformation in non-lithified sediments, whereas, previously measured joints formed later at greater burial depths in lithified strata. Paleoseismite distribution in the Eagle Formation is consistent with a segment boundary along the major thrust between the northern (N70W-trending) and central (N30W-trending) portions of the anticline.

Comments

Data is provided by the student.

Library Comment

dissertation or thesis originally submitted to the local University of Memphis Electronic Theses & dissertation (ETD) Repository.

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