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Date Permissions Signed

2-21-2018

Date of Award

Spring 1995

Document Type

Masters Thesis

Degree Name

Master of Science (MS)

Department

Geology

First Advisor

Beck, Myrl E.

Second Advisor

Babcock, R. Scott (Randall Scott)

Third Advisor

Burmester, Russell F.

Abstract

Paleomagnetic techniques were used to determine crustal rotations at two locations along the Liquine Ofqui fault zone (LOFZ) in southern Chile, South America. East of the fault zone, near the town of Lago Verde, twelve sites drilled in intermediate volcanic rocks and diorite yielded a paleomagnetic pole at 82°S, 210.8°E (A95=8.3°), which, when compared to a Late Cretaceous reference pole (the mean of Butler et al. (1991) and Somoza (1994) poles) implies 17.7° ± 11.1° of in situ, clockwise rotation. At Cocotue Beach, west of the fault zone on Isla Chiloe, seven sites drilled in middle Tertiary basalts yielded a paleomagnetic pole at 54.9°S, 349°E (A95=15.4°) that implies 45° ± 18.7° of in situ, counterclockwise rotation when compared to a middle Tertiary reference pole (Diehl et al., 1988) rotated into the South American reference frame. There is reason to have some reservations about data from both localities, but the results, nevertheless, are consistent with other kinematic studies along the LOFZ. The geology of the Lago Verde field area is described in aid of the paleomagnetic work.

Type

Text

Keywords

Paleomagnetic techniques, Crustal rotations, Lago Verde, Kinematic studies

Publisher

Western Washington University

OCLC Number

1033618334

Digital Format

application/pdf

Geographic Coverage

Chile

Genre/Form

Academic theses

Language

English

Rights

Copying of this thesis in whole or in part is allowable only for scholarly purposes. It is understood, however, that any copying or publication of this thesis for commercial purposes, or for financial gain, shall not be allowed without the author's written permission.

Map of Lago Verde Field Area reduced 7272144.pdf (147 kB)
Map of Lago Verde Field Area

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