Resumen

AGUAYO-CAMARGO, J.E.. Neotectónica y facies sedimentarias cuaternarias en el suroeste del Golfo de México, dentro del marco tectono-estratigráfico regional evolutivo del Sur de México. Ing. invest. y tecnol. [online]. 2005, vol.6, n.1, pp.19-45. ISSN 2594-0732.

The studied area comprises the south western Gulf of Mexico and the external margin of the south eastern coastal plain of Mexico, with an extensión of 150 000 km2. The geo logical province resulted from the intermittent movements of five major tectonic plates through space and time: Northamerica plate (1); the circum-pacific plates: Kula (2), Farallon (3) and Cocos (5), and the Caribbean plate (5). Due to these cortical movements, 12 to 14 km of sedimentary column were de posited in the marginal continental accretionary prism in environments which varied from continental to deep marin, since Late Triassic trough Recent. Based on the geological and geophysical data from the marine and continental sub surface facilited by Pemex-IMP; such in formation was intergrated with the one previously established by several authors, from the out crop ping stratigraphic sequences of the Sierra de Chiapas, which were verified at selected lo calities, and also with the Quaternary data obtained during this research, with all these data it is here in interpreted the following stratigraphic mega sequences at south eastern Mexico and south western Gulf of Mexico: 1) Mesozoic transgression, 2) Paleogene regression, 3) Neo-generegression, 4) Pleistocene-late Holoceneregression and transgression, and 5) eustaticstability since late Holocene.

At the studied area morpho-bathymetry map of the sea floor by means of a continuous linear hydro-acoustic sounder of the R/V “Justo Sierra” owned by UNAM. In this map, most prominent fault systems and salt diapirs out cropping on the sea floor make conspicuous, this data was complemented with that from the stratigraphic wells and seis mic-stratigraphy profiles from the subsurface marine provinces provided by Pemex-IMP. It is here in interpreted with the integrated information, the clockwise rotation of the Yucatan block which moves in its south ernportion in Central America, along the geological province of the Libertad Arch and of the Polochic left-lateral fault ing system. The clockwise tectonic movements of the Yucatan microplate were specially important during late Miocene-early Pliocene, because it caused the reactivation and subsidence of the Tertiary tensional basins of Macuspana, Comalcalco and Salina del Istmo at south eastern Mexico.

Palabras llave : Suroeste del Golfo de México; tectónica; sedimentación; estratigrafía.

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