Lecture-12_sequence-stratigraphy_v2

Lecture-12_sequence-stratigraphy_v2 - LECTURE 12 Sequence...

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1 Depositional Sequence Conformable succession of genetically-related strata, bounded at the top and base by : Unconformities (surfaces of erosion) or their Correlative conformities (surfaces lacking erosion) A branch of stratigraphy that subdivides the rock record into a succession of depositional sequences as regional and interregional correlative units. LECTURE 12: Sequence Stratigraphy Incised Valley Fill: River deposit Continental Shelf deposit S.B. Sequence Boundaries represent: Basinward shifts in depositional facies Surfaces of erosion and/or non- deposition Surfaces across which there may be a significant biostratigraphic break Class reading from Boggs, Principles of Sedimentology and Stratigraphy Chapter 13: p.451 - 462.
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2 Shoreline-Attached Sequence Boundary Produced by fall in elevation of sea level. Headland versus Shoreline Attached Sequence- Boundaries Numerical model of T. Sun et al., WWR, v. 38, n.8, 10.1029/2001WR000284, 2002 Headland-Attached Sequence Boundary MAXIMUM EROSION AT UPSTREAM POSITION IN SYSTEM. Can be produced through 1) uplift in the basin interior or basin margin, or 2) increase in water discharge associated with river channel. Open water Open water
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3 How does a shoreline respond to a change in relative sea-level? The answer depends on whether the depositional system is carrying a sufficient amount of sediment to ‘build’ land at the rate that space is being created by the sum of sea-level change and basin subsidence (sum = relative sea-level change). Relevant Ratio: filled area created area s L H q shoreline = + < < σ L
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4 . 1 . 2 . 3 . 4 . 5 1 2 3 4 5 Transgression : landward migration of the shoreline Regression : seaward migration of the shoreline Progradation : seaward growth of entire alluvial system
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This note was uploaded on 02/08/2011 for the course GEO 416M taught by Professor Staff during the Fall '08 term at University of Texas.

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Lecture-12_sequence-stratigraphy_v2 - LECTURE 12 Sequence...

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