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A Brief Introduction to Sequence Stratigraphy

A Brief Introduction to Sequence Stratigraphy. The Sea Level Record. Highstand Deltas of the East Texas shelf. Main Surfaces 1. Sequence Boundary 2. Maximum Flooding Surface 3. Transgressive Surface. Systems Tracts.

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A Brief Introduction to Sequence Stratigraphy

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  1. A Brief Introduction to Sequence Stratigraphy

  2. The Sea Level Record

  3. Highstand Deltas of the East Texas shelf

  4. Main Surfaces1. Sequence Boundary2. Maximum Flooding Surface3. Transgressive Surface

  5. Systems Tracts

  6. Seismic and Chronostratigraphy(Oxygen isotope stratigraphic analysis and biostratigraphic analysis used to relate surfaces and the systems tracts they bound to sea level curve)

  7. Contrasts in Stratigraphic Architecture (http://gulf.rice.edu)West Florida Margin(Steep, ramp-like profile,low subsidence, bedload -dominated rivers)1. Sandy, late highstand deltas dominate2. No lowstand delta/fan3. Extensive transgressive sheet sandWestern Louisiana/Brazos/Lagniappe Margins(Broad, low-gradient margins, moderatesubsidence, high sediment supply rivers)1. Dominance of late highstand deltas2. Sands in channels and mouth bars3. No lowstand fansEast Texas-Trinity/Sabine Margin( Broad, low-gradient margin fed byrivers with moderate sediment supply)1. Re-incision of valleys results in significant shelf bypass and fan nourishmentEast Texas-Colorado Margin(Broad, low-gradient margin, moderate sediment supply)1. Sands occur in late highstand, lowstand and transgressive deltas and in lowstand slope fansCentral Texas Margin(Steep, ramp-like margin with moderatesubsidence, rivers with low sediment yields)1. Sands mostly confined to highstand andconsist of strike-oriented shoreface deposits.2. No lowstand deltas or fansSouth Texas (Rio-Grande) Margin(Broad, low-gradient margin with moderatesubsidence)1. Extensive, sandy highstand, lowstand andtransgressive deltas and lowstand slope fan

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