Lecture 7 Shallow clastic seas

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Presentation transcript:

Lecture 7 Shallow clastic seas

epicontinental pericontinental

Dominant controls on sedimentation patterns Sediment transport (hydraulic regime) Sediment supply Relative sea-level changes Tectonic environment

Dominant controls on sedimentation patterns Sediment transport (hydraulic regime) Sediment supply Relative sea-level changes Tectonic environment

Tectonic environment EXAMPLES U.S. Eastern seaboard Gulf of Alaska Taiwan

Dominant controls on sedimentation patterns Sediment transport (hydraulic regime) Sediment supply Relative sea-level changes Tectonic environment

Dynamic stratigraphic models Rate of sediment supply exceeds rate of accommodation-space creation and sediment dispersal Regression dominates

Rate of sea-level rise and sediment transport/dispersal exceeds rate of sediment supply Transgression dominates

Dominant controls on sedimentation patterns Sediment transport (hydraulic regime) Sediment supply Relative sea-level changes Tectonic environment

80% 3% 17%

Tide-dominated shallow seas Supply-dominated examples are rare: Amazon shelf Bohai gulf Tidal range > 3-4 meters V > 60 cm/sec Accommodation-dominated situations are much more common Partially enclosed seas, elongate seaways, blind gulfs

150 100

Storm-dominated systems

Transport, deposition and erosion in the near-shore environment