Late Miocene Extensional Deformation in the Sierra Bacha, Coastal Sonora, Mexico: Implications for the Kinematic Evolution of the Proto-Gulf of California

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dc.contributor.authorDarin, Michael Harrison
dc.date.accessioned2012-04-20T23:14:33Z
dc.date.available2012-04-20T23:14:33Z
dc.date.issued2011-12
dc.descriptionxv, 95 p. : ill. (some col.), maps (some col.) Plate 1. Geologic Map of the Sierra Bacha, Coastal Sonora, Mexico (1:30,000 scale) attached as a separate file.en_US
dc.description.abstractThe Gulf of California is an active rift basin formed by late Cenozoic dextral-oblique extension along the Pacific-North America plate boundary. Well exposed volcanic and sedimentary rocks in the Sierra Bacha, coastal Sonora, Mexico, preserve a history of proto-Gulf (late Miocene) deformation and offer insight into the structures and kinematics responsible for localization of the plate boundary and inception of the Gulf at about 6 Ma. Geologic mapping, fault kinematic analysis, and paleomagnetic data suggest that proto-Gulf deformation in the Sierra Bacha occurred primarily by ENE-WSW extension and that vertical-axis rotation related to dextral strain was minor. Lack of significant dextral shear supports an emerging model for proto-Gulf deformation in which dextral strain was not ubiquitous across Sonora but instead became localized during latest Miocene time in a narrow coastal shear zone that mechanically weakened the lithosphere and helped facilitate continental rupture. This thesis includes the "Geologic Map of the Sierra Bacha, Coastal Sonora, Mexico" as supplemental material.en_US
dc.description.sponsorshipCommittee in charge: Dr. Rebecca J. Dorsey, Chairperson; Dr. Marli B. Miller, Member; Dr. Ray J. Weldon II, Memberen_US
dc.identifier.urihttps://hdl.handle.net/1794/12189
dc.language.isoen_USen_US
dc.publisherUniversity of Oregonen_US
dc.relation.ispartofseriesUniversity of Oregon theses, Dept. of Geological Sciences, M.S., 2011;
dc.rightsrights_reserveden_US
dc.subjectGeologyen_US
dc.subjectContinental Dynamicsen_US
dc.subjectPlate Tectonicsen_US
dc.subjectEarth sciencesen_US
dc.subjectExtensionen_US
dc.subjectGulf of Californiaen_US
dc.subjectSonoraen_US
dc.subjectStrain localizationen_US
dc.subjectTranstensionen_US
dc.titleLate Miocene Extensional Deformation in the Sierra Bacha, Coastal Sonora, Mexico: Implications for the Kinematic Evolution of the Proto-Gulf of Californiaen_US
dc.title.alternativeImplications for the Kinematic Evolution of the Proto-Gulf of Californiaen_US
dc.typeThesisen_US

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