Syndepositional Structures on Mobile Substrates
A.J. Skeryanc, C.R. Kolodny, 1983. "Syndepositional Structures on Mobile Substrates", Seismic Expression of Structural Styles: A Picture and Work Atlas. Volume 1–The Layered Earth, Volume 2–Tectonics Of Extensional Provinces, & Volume 3–Tectonics Of Compressional Provinces, A. W. Bally
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The accompanying seismic line is part of a regional dip line located offshore Texas in the Gulf of Mexico. The line traverses three major interrelated syndepositional growth structures typical of the province. These three structures (growth faults, withdrawal synclines, and "growth ridges") develop concurrently with progradation of depositional systems across mobile substrata. The local complexities and regional variations in the observed structural patterns are essentially related to two controlling factors. They are the variation in the depositional environment and the rate of sediment supply to the system.
The regional trend of growth faults is essentially parallel to the shoreline. Locally, patterns vary from linear to arcuate. Growth faults are observed to flatten with depth into a zone of detachment. The downthrown seismic events, which appear to dip more steeply into the fault plane, exhibit a greater rotation with increasing depth. This relationship is apparent on the Lower Miocene expander, which is observed to expand the section over 3,048 m (10,000 ft), at the north end of the seismic line.