Sed Strat Exam #2 Pt. 3

Front 1

Deltas

Back 1

form where rivers enter lakes, seas, oceans.
-- supple seds. more rapidly that can be redistributed

Front 2

alluvial deltas--3 main influences on depositional geometry in terms of high energy

Back 2

1. fluvial dominated
2. Tide dominated
3. wave dominated

Front 3

Fluvial Dominate

Back 3

dominated by type of flow (mixing of water)
--homopychal (same density)
--similar densities--rapid mixing and abrupt depostion

Front 4

Progradation

Back 4

--building outwards into basin
--synonymous with marine regression

Front 5

hyperpycnal

Back 5

high sed load river water entering
--under flows-->turbidy currents
---commonly on steep sided basins

Front 6

hypopucnal

Back 6

less dense--marine deltas/ Fresh river water enters marine water
--large active de;ta fronts w/ foresets dipping

Front 7

Tide dominate deltas

Back 7

large tidal range; minimal wave power; distributaries are tidal channels that show bi-directional flow and rapid migration distributary mouth ars are re-worked into tidal bars-->example: ganges-Brahmaputra delta-tidal range = 4m

Front 8

wave dominated deltas

Back 8

large wave power; distributary mouth bars are reworked by longshore currents and wave processes
-->smooth delta front with wave-buil beaches, barrier island and spits; example: sa francio delta, Brazil range = 2 m

Front 9

Barrier islands form by (2)

Back 9

split segmentation

drwoning of shoreline during sea level rise