Wednesday morning: Peripheral Aspects of Paleogene Development, Gulf of Mexico
2007. "Wednesday morning: Peripheral Aspects of Paleogene Development, Gulf of Mexico", The Paleogene of the Gulf of Mexico and Caribbean Basins: Processes, Events and Petroleum Systems, Lorcan Kennan, James Pindell, Norman C. Rosen
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Laramide deformation is represented in stratigraphic sequences and structures in the Burgos Basin. Paleontological data support the continued eastward migration of siliciclastic facies in space and time from the western central Mexican basin at Zacatecas to the eastern Burgos Basin at Tamaulipas. In the Burgos Basin, Paleocene and Eocene Wilcox deposits are thirdorder sequences which may be controlled by eustatic sea level changes from 60 Ma to around 49 Ma. Overlying the upper Wilcox and lower Reklaw deposits, a regional deeply erosive surface has a suggested age around 48.5 Ma; above this unconformity a prograding wedge complex having a TST (upper Reklaw deposit) is identifiable. The Queen City, Weches-Cook Mountain and lower Yegua (Crockett) deposits are also third-order sequences from 48.5 to around 39.5 Ma, inferred to be controlled by eustasy and synsedimentary growth faults.
A new deeply erosive surface developed around 39.5 Ma. Above this submarine unconformity, the middle and upper Yegua were deposited and represent another prograding wedge complex having a high sedimentary rate (280 m/Ma). In the surface and subsurface of the Burgos Basin, the folded Paleocene-Eocene rocks strike north-northwest/south-southeast as a result of Laramide deformation. Isotopic and structural data in the Sabinas Basin support the idea that both unconformities (at base upper-Reklaw and at base middle-Yegua) are related to uplift and denudation in western continental areas and have been produced mainly by tectonic mechanisms, during progressive pulses of the Laramide uplift of the Sierra Madre Oriental and fold belt of the Sabinas Basin. The younger Frio sequence belongs to another tectonic event, discrete from the Laramide uplift.