Geologic-Structural and Geophysical Study of Cabo San Roman-Barquisimeto Section, Falcon and Lara State.

HR: 1340h
AN: T33B-1369 [Abstracts]
TI: Geologic-Structural and Geophysical Study of Cabo San Roman-Barquisimeto Section, Falcon and Lara State.
AU: * Sousa Pereira, J
EM: jjccsspp74@cantv.net
AF: Juan Carlos Sousa Pereira, Apartado Postal 48248 Zona Postal 1041A, Los Chaguaramos, Caracas, DC 1041 Venezuela
AU: Rodriguez G., J C
EM: josmatr@cantv.net
AF: Josmat C. Rodr¡guez G., Av. Ppal. La Hacienda, sector UD5, Edif. 14, Apto. 501, Caricuao., Caracas, DC 1100 Venezuela
AU: Rodr¡guez M., I
EM: iniromil@yahoo.com.mx
AF: In¡rida Rodr¡guez M., Calle Tur¡n, Qta. Silvana, California Norte, Petare., Caracas, DC 1070 Venezuela
AU: Alezones U., R
EM: aleric@cantv.net
AF: Ricardo Alezones U., Centro Polo, Bello Monte., Caracas, DC 1040 Venezuela
AU: Giraldo C., C
EM: carlgiraldo@cantv.net
AF: Carlos Giraldo C., Sevilla, Espa¤a, Sevilla, - 41009 Spain
AU: Audemard M., F
EM: faudemard@funvisis.org.ve
AF: Frank Audemard M., FUNVISIS, El Llanito, Caracas, DC 1070 Venezuela
AB: The main objective of this investigation is the geologic-structure interpretation of the Falcon Basin inverted along the Cabo San Rom n-Barquisimeto Section, by means of an integrated Geology and Geophysics study starting from several gravity-magnetics models of the section based on geophysical and geologic data. The area of study is located inside a corridor, that it have 10 km wide and 244 km long, with an area of 2440 km2. The profile, with the corresponding corridor, begins on north of the Paraguana Peninsula in the Punta Barco town and finishes at the south of Barquisimeto City in the Lara State, near the town of Las Cuibitas, with a trend of N 14øW (346ø). For the geophysical analyses we considered a much more extensive window defined by the parallels 12ø20'N and 10øN, and the meridians 70øW and 69øW. Begining from the analysis of the gravity-magnetics models proposed with different alternatives of slab subduction, we appreciated that shallow slab subduction model is of better adjustment, with the presence of the Bonaire Block. The structural map exhibits three well differentiated areas, so much in the geologic environments as in the structural styles, which is show in a decisive way on the geomorphology of the whole region. From the maps analyses and gravity-magnetics models presented, it is evidenced a cortical thinning at the center of the Falcon Basin inverted, defining a graben, which is limited southward for the Oca-Ancon faults system, while northward the limit is not expressed in surface. This geometry evidences that Falcon Basin was formed during a distensive regime. The balanced section demonstrates two tectonics settings and a third that includes both first regimens: a) compressional "pulses" at the beginning of the Tertiary, b) a relax and extension phase in Middle to Late Tertiary and c) a new compressive phase post-Tertiary. CONTRIBUTION TO PROJECT G-2002000478
DE: 8015 Local crustal structure
DE: 8105 Continental margins and sedimentary basins
DE: 8107 Continental neotectonics
DE: 8110 Continental tectonics--general (0905)
DE: 8122 Dynamics, gravity and tectonics
SC: Tectonophysics [T]
MN: 2004 AGU Fall Meeting