Source-to-sink stratigraphic modelling
Xuesong Ding, Tristan Salles, Nicolas Flament, Patrice Rey
- Badlands 1.0
Model setup of a source-to-sink generic case. (a) The initial surface consisting of the mountain range (source area), alluvial plain (transfer zone) and continental margin (sink area). (b) Eustatic sea level and its rate of change over 30 Myr. (c) Distance-dependent stretching factor and the resulting thermal subsidence at 10, 20 and 30 Myr across the continental margin.
|Non Marine Erodibility||K_e||1.e-7|
|(Rainfall * Area) exponent m||m||0.5|
|Slope exponent n||n||1.0|
|Slope Minimum for Flood-plain Deposition||slp_cr||0.001|
|Non-Marine % Max Deposition||perc_dep||0.75|
|Land sed. Transport by River||criver||10|
|Land sed. Transport by Wind||caerial||0.001|
|Lake/Sea sed. Transport by Currents||cmarine||0.005|
|No. Time Steps To Distribute Marine Deposits||diffnb||5|
|Marine % Max Deposition||diffprop||0.9|
Interpretation workflow based on the accommodation succession method. Step 1 includes marking stratal terminations (i.e. toplap, onlap and downlap represented using small arrows) and manually picking the break in slope as offlap break. The refilling of incised channels is shown in red, indicating erosional surfaces. Based on the marked stratal contacts, three stratal stacking trends (solid arrows) and three stratigraphic surfaces (coloured solid lines) are then defined in Steps 2 and 3. The three interpreted stacking patterns are filled with different colours, with their bounding times marked (Step 4). Each stacking pattern reflects the evolving ratio between rate of accommodation creation (δA) and rate of sediment supply (δS). (c) Automatically defined stacking patterns according to the calculated temporal evolution of δA − δS (> 0, < 0 and decreasing, or < 0 and increasing) (d).