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Master of Science (MS)
Beck, Myrl E.
Babcock, R. Scott (Randall Scott)
Burmester, Russell F.
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.
Western Washington University
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.
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.