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How transpressive is the northern Caribbean plate boundary?

Abstract : Transpressive deformation at the northern Caribbean plate boundary is accommodated mostly by two major strikeslip faults, but the amount and location of accommodation of the compressional component of deformation is still debated. We collected marine geophysical data including multi-beam bathymetry and multichannel seismic reflection profiles along this plate boundary around Hispaniola, in the Jamaica Passage and in the Gulf of Gonâve. The data set allows us to image the offshore active strike-slip faults as well as the compressional structures. We confirm that the Enriquillo-Plantain-Garden Fault Zone (EPGFZ) in the Jamaica Passage has a primary strike-slip motion, as indicated by active left-lateral strike-sliprelated structures, i.e.: restraining bend, asymmetrical basin, en echelon pressures ridges and horsetail splay. Based on topographic cross-sections across the EPGFZ, we image a very limited compressional component, if any, for at least the western part of the Jamaica Passage. Toward the east of the Jamaica Passage, the fault trace becomes more complex and we identify adjacent compressional structures. In the Gulf of Gonâve, distributed folding and thrust faulting of the most recent sediments indicate active pervasive compressional tectonics. Estimates of shortening in the Jamaica Passage and in the Gulf of Gonâve indicate an increase of the compressional component of deformation towards the east, which nonetheless remains very small compared to that inferred from block modelling based on GPS measurements
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Submitted on : Friday, April 15, 2016 - 2:04:04 PM
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Jordane Corbeau, Frédérique Rolandone, Sylvie Leroy, Bertrand Meyer, Bernard Mercier de Lépinay, et al.. How transpressive is the northern Caribbean plate boundary?. Tectonics, American Geophysical Union (AGU), 2016, 35 (4), pp.1032-1046 ⟨10.1002/2015TC003996⟩. ⟨hal-01302913⟩



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