Episutural Oligo-Miocene Basins along the North Venezuelan Margin
Published:January 01, 1982
B. Biju-Duval, A. Mascle, H. Rosales, G. Young, 1982. "Episutural Oligo-Miocene Basins along the North Venezuelan Margin", Studies in Continental Margin Geology, J. S. Watkins, C. L. Drake
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Multichannel seismic reflection surveys across the North Venezuelan margin between 64 and 70° W provide new data on the three major structural elements of the area; the Venezuelan Basin margin along the Curacao Ridge, the episutural Falcon and Bonaire Basins, and the southern Guyana Shield continental crust. The Curacao Ridge consists of a thick, elongated belt of deformed sediments; it resulted from Neogene underthrusting of Venezuelan Basin crust. The formation of the onshore Falcon and offshore Bonaire Basins appears to have begun in Middle or Late Eocene. Structures observed in these basins suggest regional compression with attendant folding, faulting, and differential vertical movement. Northern elements of the Guyana Shield, including the Merida Andes to the west, appear to have been involved to some extent in tectonic movements of the margin in Cretaceous to Pliocene times.
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Studies in Continental Margin Geology
"Studies in Continental Margin Geology" contains papers from a research conference co-sponsored by AAPG and the University of Texas Institute for Geophysics held in Galveston, Texas in 1981. Rapid advances in the understanding of continental margin geology were taking place during the time period, based on major improvements in the quality and availability of regional seismic surveys plus other fields such as organic geochemistry. For the first time it was becoming common to have a visual characterization of tectonic processes at significant depths below the surface. Twenty-seven papers are presented that deal with field investigations of continental margin structure and stratigraphy. The geographic areas of study are global in nature and many of the descriptive results are derived from modern seismic investigations in areas where that type of data had not previously been available in commercial publications. Fifteen of the papers focus on rifted margins and the other twelve concern convergent margins. Twelve papers are model investigations of a variety of margin environmental processes, related to subjects such as depositional environments, biostratigraphy, organic matter deposition, and oil and gas occurrences as a function of the plate tectonic setting. An additional nine papers model the thermal and mechanical tectonic processes involved in the structural development along continental margins.