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.
Active Margin Processes: Field Observations in Southern Hispaniola
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Published:January 01, 1982
Abstract
Geophysical and geological investigations suggest processes of sedimentary accretion and evolution of a forearc basin in the Southern Hispaniola region. Several different sedimentological and structural domains are defined on multichannel seismic reflection lines offshore. Other domains, including pelagic abyssal plain, trench, accretionary wedge, and forearc basin, are identified in the onshore outcrops in Southern Hispaniola. Onland deposits of the pelagic and trench domains (Southern Peninsula and Enriquillo trough), located north of Beata Ridge, are considered slightly different from the offshore ones because of collision between the thick crusts of Beata Ridge and the Central Cordillera. Accretionary wedge and forearc basin domains (Sierra de Neiba, Sierra El Numero, San Cristobal basin) provide sedimentlogical and stratigraphical data concerning the evolution of the margin. Widespread distribution of Oligocene heterometric and polymicritic conglomerates indicate an “erosional crisis,” which could date the beginning of collision processes to the west.