A constrained 2D gravity model of the Sebastián Vizcaíno Basin, Baja California Sur, Mexico |
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Authors: | J García-Abdeslem JM Romo E Gómez-Treviño J Ramírez-Hernández FJ Esparza-Hernández CF Flores-Luna |
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Institution: | CICESE, División de Ciencias de la Tierra, km 107 Carretera Tijuana–Ensenada, Ensenada, Baja California, 22860;, and Instituto de Ingeniería, UABC, Av. de la Normal s/n col. Insurgentes Este, Mexicali, Baja California, 21280 México |
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Abstract: | The subsurface geometry of the Sebastián Vizcaíno Basin is obtained from the 2D inversion of gravity data, constrained by a density-versus-depth relationship derived from an oil exploration deep hole. The basin accumulated a thick pile of marine sediments that evolved in the fore-arc region of the compressive margin prevalent along western North America during Mesozoic and Tertiary times. Our interpretation indicates that the sedimentary infill in the Sebastián Vizcaíno Basin reaches a maximum thickness of about 4 km at the centre of a relatively symmetric basin. At the location of the Suaro-1 hole, the depth to the basement derived from this work agrees with the drilled interface between calcareous and volcaniclastic members of the Alisitos Formation. A sensitivity analysis strongly suggests that the assumed density function leads to a nearly unique solution of the inverse problem. |
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