dc.contributor.author |
Darin, Michael Harrison |
|
dc.date.accessioned |
2012-04-20T23:14:33Z |
|
dc.date.available |
2012-04-20T23:14:33Z |
|
dc.date.issued |
2011-12 |
|
dc.identifier.uri |
http://hdl.handle.net/1794/12189 |
|
dc.description |
xv, 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.abstract |
The 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.sponsorship |
Committee in charge: Dr. Rebecca J. Dorsey, Chairperson;
Dr. Marli B. Miller, Member;
Dr. Ray J. Weldon II, Member |
en_US |
dc.language.iso |
en_US |
en_US |
dc.publisher |
University of Oregon |
en_US |
dc.relation.ispartofseries |
University of Oregon theses, Dept. of Geological Sciences, M.S., 2011; |
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dc.rights |
rights_reserved |
en_US |
dc.subject |
Geology |
en_US |
dc.subject |
Continental Dynamics |
en_US |
dc.subject |
Plate Tectonics |
en_US |
dc.subject |
Earth sciences |
en_US |
dc.subject |
Extension |
en_US |
dc.subject |
Gulf of California |
en_US |
dc.subject |
Sonora |
en_US |
dc.subject |
Strain localization |
en_US |
dc.subject |
Transtension |
en_US |
dc.title |
Late Miocene Extensional Deformation in the Sierra Bacha, Coastal Sonora, Mexico: Implications for the Kinematic Evolution of the Proto-Gulf of California |
en_US |
dc.title.alternative |
Implications for the Kinematic Evolution of the Proto-Gulf of California |
en_US |
dc.type |
Thesis |
en_US |