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Cordilleran Section - 97th Annual Meeting, and Pacific Section, American Association of Petroleum Geologists (April 9-11, 2001)

Paper No. 0
Presentation Time: 8:00 AM-12:00 PM

THE LOBOS BASIN A TRANSVERSE TRANSPESSIONAL BASIN IN A BLOCK ROTATION MODEL FROM LA PAZ BAY


RAÚL, Miranda-Avilés1, ENRIQUE HIPARCO, Nava-Sanchez2, BOURROUILH, Robert1 and ADOLFO, Molina-Cruz3, (1)CIBAMAR, Université de Bordeaux I, Avenue des Facultés, Talence, 33405, France, (2)CICIMAR, Instituto Politecnico Nacional, Apartado Postal 592, La Paz, 23000, Mexico, (3)Instituto de Ciencias del Mar y Limnologia, Universidad Nacional Autonoma de Mexico, Mexico, D.F, rmiranda@mexicomail.com

La Paz Bay is located in the southwestern margin of the Gulf of California, in the southern portion of the Baja California Borderland. The Lobos Basin is located in the northeastern limit of the La Paz Bay and limited by active faults, oriented N 30º and 40º E. High-resolution bathymetric and sub-bottom profiles were interpreted and suggest that Lobos Basin is a transpressional basin, dominated by left-lateral movement. Transpression in Lobos Basin can be explained by block rotation, similar to the rotation model from Luyendik (1991). The northeastern portion of La Paz Bay area is segmented in La Partida Block, Espiritu Santo Block, and Mas Alla del Espiritu Santo Block, which are clockwise rotating. We suggest a hypothetical rotational tectonic model for La Paz Bay area, with a transverse transpressional basin (Lobos Basin) in a regional right-lateral regimen. The geometry between the transverse transpressional Lobos Basin with the regional right-lateral movement could be an example of the actual tectonic behavior of some marginal basins of the Peninsular Baja California Borderland.

Session No. 27--Booth# 17

T22. Structural Geology, Tectonics, and Neotectonics (Posters)
Tuesday, 10 April 2001: 8:00 AM-12:00 PM
Geological Society of America Abstracts with Programs. Vol. 33, No. 3, March 2001, p.56
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