Electronic Theses and Dissertations

Identifier

6417

Date

2019

Date of Award

4-29-2019

Document Type

Thesis

Degree Name

Master of Science

Major

Earth Sciences

Concentration

Geology

Committee Chair

Roy B. Van Arsdale

Committee Member

Daniel Larsen

Committee Member

Randel T. Cox

Abstract

The Meeman-Shelby fault (~8 km from Memphis) and the Joiner Ridge horst (~54 km from Memphis) are two blind structures in the Mississippi River floodplain of northeastern Arkansas that have no modern seismicity but do have reported Quaternary displacement. Cores collected on the down-thrown sides of both a Meeman-Shelby fault and east-bounding fault of Joiner Ridge show upward fining alluvium and top-of-Eocene at depths of 36.5 m and 35.5 m, respectively. Seismic reflection profiles and radiometrically dates permitted the calculation of slip rates on two faults. A fault within the Meeman-Shelby fault zone has 4-m of displacement at a depth of 10-m on sediment dated at 11,250 ± 50 ka thus indicating a Holocene slip rate of 0.4 mm/yr. The Joiner Ridge east-bounding fault has 12-m of displacement at a depth of 40-m on sediment dated at 20,320 ± 63 ka thus indicating a Quaternary slip rate of 0.6 mm/yr.

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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