university of texas at arlington · junctures), tectonic (e.g., faults) local effects to lower...
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Fluvial Stratigraphy
A Webinar in the AAPG Education Seriesby
John HolbrookUniversity of Texas at Arlington
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GoalProvide some take-aways extracted from a more extensive course.
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Longitudinal Profile
River-to-Basin Processes
(Van Wagoner, et al., 1991)
Upstream Controls(e.g., Sed supply, discharge, uplift, etc.)
Downstream Controls (e.g., Sea Level, etc.)
Fluvial and Valley-Fill
Strata
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Fluvial Response to Base Level Change
Sea Level
Sea Level Fall
Fluvial Incision
Sea Level Rise
Fluvial Aggradation
Slow
Fast
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Progressive Stacking in Sheets?
Upstream Controls?
Complex Reincision?
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Fluvial Stratigraphy ComponentsGeomorphology of Fluvial SystemsFluvial FaciesArchitectural HierarchiesSeismic GeomorphologyHeterogeneity and ConnectivityControls on Fluvial StratigraphyCorrelation of Fluvial Strata
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Geomorphology of Fluvial SystemsRiver Patterns
anastomosedsinglesinuouschannels
anastomosedbraidedchannels
barassemblage
braidedchannel
Single sinuouschannels
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Rakaia River, New Zealand
Madison River, USA
(Bridge & Tye ,2000)(Posamentier and Walker, 2006)
River PatternsHigh Width:Depth
Low Width:Depth
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Fluvial Facies
(Posamentier and Walker, 2006)
(Galloway and Hobday, 1983)
cordoba_river_channel_iahmedialibrary.net
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Mud Flat
Levee
Point Bar
Overbank fine
Mississippi River “blue muds”
(Holbrook, et al. 2006)
Roman Boat in Old Rhine
Mississippi River bar top
K Dakota Channel fills
Mo River Point Bar with Drape
Peat Core, Rhine Delta Fluvial Environments
Mississippi RiverSplay sand sheet
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Fluvial Facies(Cheat Sheet)
Still Waters(Clay, Silty Clay, Peat)
Lazy River(Loams and Heterogeneous )
Swift Current(Sand and Loamy Sand)
BioturbatedNon-
Bioturbated BioturbatedNon-
Bioturbated BioturbatedNon-
Bioturbated
Mud Flat
Levee
Point Bar
Overbank fine
Floodplain Mud Flat Lake Levee/Splay
Active Channel
Splay Channel and Lobe Point Bar and
Thalweg Fill
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Bridge and Diemer (1983)
(Holbrook, 2001)
http://www.geol.binghamton.edu/faculty/bridge/R&Pcomputersim.htm
Depositional Units (John Bridge)
Bounding Surfaces (Andrew Miall)
Architectural Hierarchies
Storey
Storey
Erosion SurfaceBedset
Bedset
Channel
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Seismic Geomorphology
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Fluvial Hierarchies in Seismic Geomorphology
Darmadi et al, 2007
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Heterogeneity and Connectivity
(Larue 2006)
(Jordan and Pryor, 1992)
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http://www.geol.binghamton.edu/faculty/bridge/R&Pcomputersim.htm
John Bridge
(Bridge and Tye, 2000)
http://en.wikipedia.org/wiki/Oil_platform
Channel Belts as Target Units(Gibling, 2006)
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Odds of Hitting Sandy Channel Belt = VariableOdds of Hitting Full Section of Bar Sand within Belt =
3 in 5
http://en.wikipedia.org/wiki/Oil_platform
Channel Area=40%Bar Area = 60%
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http://en.wikipedia.org/wiki/Oil_platform
Connections?
Trapped Product?
(Saucier, 1994)
(Jordan and Pryor, 1992)
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Controls on Fluvial Stratigraphy
Sea Level
Sea Level Fall
Fluvial Incision
Sea Level Rise
Fluvial Aggradation
Slow
Fast
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Longitudinal Profile
River-to-Basin Processes
(Van Wagoner, et al., 1991)
Upstream Controls(e.g., Sed supply, discharge, uplift, etc.)
Downstream Controls (e.g., Sea Level, etc.)
Fluvial and Valley-Fill
Strata
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Assumption: Base level, and the related longitudinal profile, is the primary control on aggradation in both upstream and downstream settings.
Downstream vs. Upstream Base Level Controls
Downstream Controls Upstream Controls
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Assumption: Base level, and the related longitudinal profile, is the primary control on aggradation in both upstream and downstream settings.
Downstream vs. Upstream Base Level ControlsDownstream Controls
Eustatic (sea level/lake level), morphologic (e.g., tributary junctures), tectonic (e.g., faults)
Upstream ControlsClimate (e.g., sediment supply, discharge), tectonic (e.g., uplift rate)
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Assumption: Base level, and the related longitudinal profile, is the primary control on aggradation in both upstream and downstream settings.
Downstream vs. Upstream Base Level ControlsDownstream Controls
Eustatic (sea level/lake level), morphologic (e.g., tributary junctures), tectonic (e.g., faults)
Local effects to lower reaches causing adjustments that propagate and dampen upstream
Upstream ControlsClimate (e.g., sediment supply, discharge), tectonic (e.g., uplift rate)
Broad effects in upstream reaches causing adjustments that propagate and dampen downstream
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Assumption: Base level, and the related longitudinal profile, is the primary control on aggradation in both upstream and downstream settings.
Downstream vs. Upstream Base Level ControlsDownstream Controls
Eustatic (sea level/lake level), morphologic (e.g., tributary junctures), tectonic (e.g., faults)
Local effects to lower reaches causing adjustments that propagate and dampen upstream
Generally causes adjustments on the scale of 101 to 102 meters and 104 to 107 years
Upstream ControlsClimate (e.g., sediment supply, discharge), tectonic (e.g., uplift rate)
Broad effects in upstream reaches causing adjustments that propagate and dampen downstream
Generally causes adjustments on the scale of 100 to 101 meters and 101 to 104 years
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E.G.,δyb/δt=-Krqa[1+K1qsdc]Sk
(Howard et al., 1994)
The “Graded” Longitudinal ProfileProfile variable because of non-constant upstream controls:
Water Discharge (Qw)Sediment Flux (Qs)
Substrate ErodabilityUplift Rate
Local TectonicsEtc.
River Profile
Anchor pointDownstream base-level control
(e.g., sea level)
?!(Blum et al., 1994)
2500 BP to Modern
Channel TerraceFloodplain
Alluvial Sequences on Colorado River, Central Texas
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Sea Level
Base Level Buffers and Buttresses
Determiners of “Graded” Profile ElevationSediment Influx/Transport Capacity =1 (eq. 1)
dz/dt + dqs/dx = 0 (eq. 2)Where:
qs = Sediment Discharge= f(ω, substrate erodability)Sediment Influx = qs delivered at xi = f (drainage basin)
Transport Capacity = qs that can be transported at xi
dz/dt = 0
Variablesz Profile elevationx Stream distancet Timeω=γQwSω Stream Powerγ Specific WeightQw Water DischargeS Slope
Buttress(Sea Level, Cataract,
Lake Level, etc.)
Preservation Space
Lower Buffer ProfileTransport Capacity = MaxSediment Influx = MinUplift Rate = Min
Buffer ZoneInstantaneous
Profile
Upper Buffer ProfileTransport Capacity = MinSediment Influx = MaxUplift Rate = Max
Buffersf(Qw)
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Some Effects of Buttress Shift
Down-Profile Buttress Shift
Buttress Rise
Buttress Fall
Σ
Σ
Σ
Unit Thickness=
Unit Thickness=
Unit Thickness=
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Correlation of Fluvial Strata
Fluvial-on-Fluvial SB’sSequence Boundaries vs. Settings (Alluvial)
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v1 v2 v3 v4
Mesa Rica
(Wellner and Bartek, 2003)
Sequence boundaries as time surfaces?
LST
HST
TST
FSST
(Strong and Paola, 2008)
Sequence boundary formed over 75% of the entire sea level
cycle!!!
Composite Surface
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Sequence Boundaries as Topographic Surfaces?
Sequence Boundary
(Holbrook, 1996)
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Sequence Boundaries as Unconformities?
(Strong and Paola, 2008)
Fluvial T2
Marine T2
T2 Sequence Boundary
Fluvial T2
T2 Sequence BoundaryMarine T3
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See you in December!
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Q&Awith
John HolbrookUniversity of Texas at Arlington
AAPG Education Series Courses and Resourcesavailable at
www.aapg.org/education