Fluvial Sequence Stratigraphy

Fluvial Sequence Stratigraphy Fluvial Sequence Stratigraphy - Start

2016-04-21 178K 178 0 0

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(Base Level and Accommodation). Aggradation. S. ediment . is deposited. Incision. Sediment is eroded. At equilibrium, river follows . graded profile. controlled by elevation of source area and . base . ID: 286626 Download Presentation

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Fluvial Sequence Stratigraphy




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Presentations text content in Fluvial Sequence Stratigraphy

Slide1

Fluvial Sequence Stratigraphy(Base Level and Accommodation)

Aggradation

S

ediment is deposited

Incision

Sediment is eroded

Slide2

At equilibrium, river follows graded profile controlled by elevation of source area and base level (approximately sea level)

Tectonism

Eustasy

Climate (river discharge)

transport capacity vs. sediment load

Effect of

eustasy

decreases in upstream direction

Slide3

Depositional Sequence: complete cycle of base level

Base level rise

Initial equilibrium profile

New equilibrium profile

Accommodation space – river aggrades

Base level fall

New equilibrium profile

Initial equilibrium profile

Negative accommodation – river incises

Slide4

How do fluvial type, geometry, and facies differ at different parts of the base level cycle (sequence)?

Fluvial type – braided or meandering?Channel geometry – isolated or amalgamated?Grain size – fine or coarse?

Slide5

Base level fall leads to negative accommodation and therefore incision

Slide6

Early parts of base level rise?

Base level fall

New equilibrium profile

Initial equilibrium profile

At the end of base level fall, equilibrium profile is at its steepest

Coarse sediment available from erosion during incision

Slide7

Low-Accommodation Fluvial Deposits

Dominated

by

higher-energy (coarser-grained) fluvial systems (often braided)

Slide8

Rate of base level rise is slow

Geometry of fluvial deposits is a balance between lateral migration of channel erosion and upward aggradation of channel position

Slide9

Low-Accommodation Fluvial DepositsDominated by amalgamated “multi-storey” channel-fill with few floodplain units

Slide10

Rate of base level rise is fast

High-Accommodation Fluvial Deposits

Dominated

by aggrading floodplain deposits with thin, isolated (“single

storey

”) channel sandstones

Slide11

High-Accommodation Fluvial DepositsDominated by lower-energy fluvial systems (often meandering)High-accommodation successions comprise most of fluvial depositional sequence

Slide12

Equilibrium profile gradient

large

small

Rate of accommodation

high

0

low

Slide13

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