Hunter Yarborough, 1977. "Continental Margin Types Related to Plate Tectonics and Evolution of Margins", Geology of Continental Margins, Joseph R. Curray, William R. Dickinson, Wallace G. Dow, Kenneth O. Emery, Donald R. Seely, Peter R. Vail, Hunter Yarborough
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Three fundamental styles of structural deformation have formed the margins of the continents since late Paleozoic time. The structural and sedimentary histories of the shelves and slopes appear to be genetically related to either a single simple structure style or to multihistory deformation in which two or even three different styles have been operative. The following discussion relates specifically to the sedimentary sequences occurring at the margins of our continents; not to the intracratonic rift basins, sinks, and sags (i.e. North Sea, Sirte Basin, etc.) that indent margins of many continents or to “drowned cratons” (i.e. The Sunda Shield, etc.).
One of these styles is characterized by extensional tectonics, a result of the “break-up” of the supercontinents of Gondwana and Laurasia which occurred primarily during the Mesozoic and early Cenozoic eras. In contrast, during middle and late Cenozoic times plate movements have deformed many plate boundaries by “shear-zone tectonics.” This second style of margin has been subjected to divergent extension and/or convergent compression as components of the synthetic shearing. Subduction, occurring at the “leading edges” of plates in motion, is the third basic style of continental margin deformation. Within this tectonic framework may be found both frontal and marginal basins. The structural, sedimentary, and volcanic histories of these subduction margins involve complex geologic relationships and pose extremely difficult exploration problems. Direct subduction, oblique subduction, island-arc collision, continental collision, and “flipped” Benioff zones are some of the scenarios depicting such margins.
In spite of the great thicknesses of both marine and
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Geology of Continental Margins
Written in 1977 the publication presents interpretations of then-new data bearing on the geology and geophysics of continental margins. The book includes a discussion of plate tectonics and evolution of continental margins; presentations on the stratigraphy and structure of pull-apart and compressional margin;, prospective petroleum source rocks, their organic content, rate of burial, and distribution on slopes and rises of different margin types; prospective reservoir rock patterns in relation to depositional processes and to the sedimentary and structural histories for different types of continental margins; and seismic recognition of depositional facies on slopes and rises for different margin types with varying rates of sediment supply during eustatic sea-level changes.