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Tectonics of the Nazca-Antarctic plate boundaryA new bathymetric chart of part of the Chile transform system is constructed, based mainly on an R/V Endeavor survey from 100 deg W to its intersection with the East Ridge of the Juan Fernandez microplate. A generally continuous lineated trend can be followed through the entire region, with the transform valley being relatively narrow and well-defined from 109 deg W to approximately 104 deg 30 min W. The fracture zone then widens to the east, with at least two probable en echelon offsets to the south at 104 deg and 102 deg W. Six new strike-slip mechanisms along the Chile Transform and one normal fault mechanism near the northern end of the Chile Rise, inverted together with other plate-motion data from the eastern portion of the boundary, produce a new best-fit Euler pole for the Nazca-Antarctic plate pair, providing tighter constraints on the relative plate motions.
Document ID
19880033467
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Anderson-Fontana, Sandra
(Rhode Island Univ. Narragansett, RI, United States)
Larson, Roger L.
(Rhode Island, University Narragansett, United States)
Engeln, Joseph F.
(Missouri, University Columbia, United States)
Lundgren, Paul
(Rhode Island Univ. Narragansett, RI, United States)
Stein, Seth
(Northwestern University Evanston, IL, United States)
Date Acquired
August 13, 2013
Publication Date
November 1, 1987
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 86
Issue: 1
ISSN: 0012-821X
Subject Category
Geophysics
Accession Number
88A20694
Funding Number(s)
CONTRACT_GRANT: NSF OCE-83-08894
CONTRACT_GRANT: NAS5-27238
CONTRACT_GRANT: NSF EAR-86-18038
Distribution Limits
Public
Copyright
Other

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