By D. Fraser Keppie
Modern researchers in plate tectonics should be fascinated by the research of dispensed deformation throughout diffuse plate barriers and triple junction zones. This ebook extends vintage equipment of kinematic research first built within the Sixties to the extra basic eventualities of diffuse deformation zones among plates. The analytic tools offered particularly aim the non-rigid deformation implied via volatile triple junction configurations. those equipment are then utilized to the tectonic evolution of western Caribbean zone which supplies new how you can attempt and problem the verified Pacific version of Caribbean tectonics. attainable merits of the hot Pirate version of Caribbean tectonics are mentioned when it comes to paleo-geography and paleo-ocean connections, in addition to mineral and hydrocarbon power and seismic hazards around the region.
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Extra info for The Analysis of Diffuse Triple Junction Zones in Plate Tectonics and the Pirate Model of Western Caribbean Tectonics
2006; Morgan et al. 2008) and dextral (La Femina et al. 2002), except for the Cordillera de Talamanca in Costa Rica, which is positive (La Femina et al. 13c). Previous studies attribute shortening in Costa Rica with the subduction of the Cocos Ridge, and related dextral shear in Nicaragua to lateral extrusion (La Femina et al. 13a–c). 13d). One possibility is that subduction of the Cocos Ridge produces deformation local to the Cordillera de Talamanca, but this mechanism cannot explain dextral shear in the Central American arc (Ego and Ansan 2002).
1997; Kerr and Tarney 2005; Pindell et al. 2006). Active slab rollback and back-arc extension in juvenile subduction systems (Gurnis and Hager 1988) is consistent with the fixed variation of the in-situ model and the mid- to late-Cretaceous ages for eastern Caribbean Plate lithosphere (Macdonald et al. 2000). Since ca. 10 Ma, rifting in the western Chortis rifts and Sula rift (Rogers and Mann 2007) corresponds to the widening-variation of the Insitu model (James 2009). 16). At the northwest Caribbean Plate corner, the microplate variation would account for synchronous: (1) counter-clockwise rotations of microplates during the Cretaceous and Cenozoic (Gose 1985) including opening of the Gulf of Mexico and escape of North American microplates (Pindell 1985; Dickinson 2009), (2) extension in the northwest Gulf of Mexico (Rangin et al.
2011). 2 The Transient Mexican Microplates The Rio Bravo fault zone (northern Mexico), extends from near southern California to the Burgos basin in the western Gulf of Mexico, and was active between ca. 40 and 30 Ma (Flotte et al. 1). 12c). Between ca. 25 and 17 Ma, the volcanic arc above the Acapulco trench in southern Mexico migrated rapidly landwards (Keppie et al. 2009; Morán-Zenteno et al. 12a). Landward arc migration may have been diachronous, older in the west and younger in the east (MoránZenteno et al.