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305-pp14 - UNIVERSITY OF SOUTH ALABAMA Last Time Sequence...

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1 GY 305: Geophysics GY 305: Geophysics Lecture 14: Lecture 14: Sequence Stratigraphy 2 Sequence Stratigraphy 2 UNIVERSITY OF SOUTH ALABAMA Last Time Last Time Sequence Stratigraphy The basic concept (systems tracts) All sorts of STs (systems tracts) Sequence Stratigraphy A Short History Accommodation Space : The thickness of sediment that can be deposited (it’s sea level-controlled) http://strata.geol.sc.edu/terminology/system-tract.html Sequence Stratigraphy Those packages of sediment may have distinctive internal structures (like clinoforms ) that allow you to determine how and when they formed relative to sea level position . http://strata.geol.sc.edu/terminology/system-tract.html Sequence Stratigraphy http://strata.geol.sc.edu/terminology/system-tract.html Sequence Stratigraphy Is derived from seismic profiles whereby you recognize distinct sedimentary packages ( systems tracts ) From Carter et al., 1991
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2 Sequence Stratigraphy A Short History Note: Vail’s surfaces actually define packages of sedimentary rock. Those associated with specific states of sea level are called systems tracts . http://strata.geol.sc.edu/terminology/system-tract.html Sequence Stratigraphy (System Tracts) LST: Low stand systems tract : includes deposits that accumulate after the onset of relative a sea-level rise. Lowstand Systems Tract sediments often fill or partially infill incised valleys that were cut into the HST, and other earlier deposits, during the FSST (falling stand systems tract) http://strata.geol.sc.edu/terminology/system-tract.html
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