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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
DOI
https://doi.org/10.25710/1ycv-wg86
Publisher
Western Washington University
OCLC Number
1033618334
Subject – LCSH
Faults (Geology)--Chile; Plate tectonics--Chile; Paelomagnetism--Chile; Kinematics
Geographic Coverage
Chile
Format
application/pdf
Genre/Form
masters theses
Language
English
Rights
Copying of this document 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.
Recommended Citation
Steele, Brian C. (Brian Christopher), "Kinematic Implications of Paleomagnetic Data from Lago Verde and Northern Isla Chiloe, Southern Chile" (1995). WWU Graduate School Collection. 667.
https://cedar.wwu.edu/wwuet/667
Map of Lago Verde Field Area