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Rapid localization of Pacific-North America plate motion in the Gulf of California

Michael Oskin, Joann Stock and Arturo Martin-Barajas
Rapid localization of Pacific-North America plate motion in the Gulf of California
Geology (Boulder) (May 2001) 29 (5): 459-462


Correlation of late Miocene volcaniclastic strata across the northern Gulf of California shows that the Pacific-North America plate boundary localized east of the Baja California peninsula ca. 6 Ma. Dextral offset of the 12.6 Ma Tuff of San Felipe and a pair of overlying ca. 6.3 Ma pyroclastic flows indicate at least 255+ or -10 km of displacement along an azimuth of 310 degrees . Isopach and facies trends of the Tuff of San Felipe support no more than a few tens of kilometers of additional dextral displacement between 12.6 and 6.3 Ma. These constraints indicate that nearly all of the dextral displacement between the Pacific and North American plates prior to 6.3 Ma was accommodated outside of the gulf region, and by 4.7 Ma, the plate boundary motion was localized in the Gulf of California. Although continental extension has accounted for a component of plate boundary motion in northwestern Mexico since cessation of subduction offshore of southern Baja California at 12.5 Ma, transfer of Baja California to the Pacific plate was delayed by at least 6-7 m.y.

ISSN: 0091-7613
EISSN: 1943-2682
Serial Title: Geology (Boulder)
Serial Volume: 29
Serial Issue: 5
Title: Rapid localization of Pacific-North America plate motion in the Gulf of California
Affiliation: California Institute of Technology, Division of Geological and Planetary Sciences, Pasadena, CA, United States
Pages: 459-462
Published: 200105
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 36
Accession Number: 2001-038577
Categories: Solid-earth geophysicsStratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2001048; Calif. Inst. Technol., Div. Geol. and Planet. Sci., Contrib. No. 8712
Illustration Description: illus. incl. 1 table, sketch maps
N29°00'00" - N31°00'00", W115°00'00" - W112°00'00"
Secondary Affiliation: Centro de Investigacion Cientifica y Educacion Superior de Ensenada, MEX, Mexico
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200112
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