Structure of the rift basins in the central Gulf of California: Kinematic implications for oblique rifting

Transtensional rifting in the proto-Gulf of California near Bahia Kino, Sonora, Mexico

“…For this magnitude of rift obliquity, analog experimental models predict combinations of NW-striking dextral faults, NE-striking sinistral faults, N-S-striking dip-slip faults, and variously oriented obliqueslip structures for the Gulf of California (Withjack and Jamison, 1986). Marine geophysical (e.g., Lonsdale, 1989;Fenby and Gastil, 1991;Aragón-Arreola et al, 2005;Aragón-Arreola and Martín-Barajas , 2007) and onshore geological studies (e.g., Gastil et al, 1975;Umhoefer and Stone, 1996;Seiler et al, 2010;Fletcher and Munguía, 2000;this study) in the Gulf of California have identifi ed signifi cant rift structures that corroborate these model predictions and together accommodate obliquely divergent relative plate motion.…”

“…1; Oskin and Stock, 2003b;Bennett et al, 2012) and continues >150 km southeastward into a zone of high-angle (strikeslip?) faulting along the edge of the continental shelf offshore southern Sonora (Aragón-Arreola et al, 2005).…”

Why Orange Guaymas Basin Beggiatoa spp. Are Orange: Single-Filament-Genome-Enabled Identification of an Abundant Octaheme Cytochrome with Hydroxylamine Oxidase, Hydrazine Oxidase, and Nitrite Reductase Activities

“…uaymas Basin is a midocean spreading center located at about 2,000 m depth in the Gulf of California (1), where hydrothermal fluid percolates to the surface through a complex system of basaltic sills and dikes, which are buried in organic-rich sediments derived from terrestrial runoff and the highly productive overlying waters (2,3). Orange and white Beggiatoaceae filaments are typically found together in the central portion of Guaymas Basin sediment-surface microbial mats, where subsurface temperature gradients are steepest, surrounded by a mat dominated by white filaments (4).…”

Petrologic diversity of Plio-Quaternary post-subduction volcanism in northwestern Mexico: An example from Isla San Esteban, Gulf of California

“…L'étoile indique la localisation de l'île San Esteban. Cartouche : schéma tectonique de la partie centrale du golfe de Californie (d'après Escalona-Alcázar and Delgado-Argote [2000] ; Stock [2000] ; Aragón-Arreola et al [2005] After the first collision of the Pacific/Farallon spreading ridge with the North America margin at 28.5 Ma, at the latitude of Point Conception, close to the Pioneer fracture zone, the Rivera triple junction migrated to the south whereas the Mendocino triple junction migrated to the north. Between them, the spreading ridge is thought to have subducted and therefore developed slab windows [Dickinson and Snyder, 1979;Thorkelson and Taylor, 1989;Dickinson, 1997;Atwater and Stock, 1998], even if their existence, shape and locations are still questioned [see for example Bohannon and Parsons, 1995].…”