Changes

==GOM basin example==

==GOM basin example==

[[file:sedimentary-basin-analysis_fig4-25.png|thumb|300px|{{figure number|1}}. Copyright: Armentrout (1993); courtesy Gulf Coast SEPM.]]

[[file:sedimentary-basin-analysis_fig4-25.png|thumb|300px|{{figure number|1}}Correlation of the third-order eustatic curve of Haq et al. (1988) and the oxygen isotope curve of Williams and Trainor (1987) with seven prograding clinoform intervals from the High Island South Addition in the GOM basin. Copyright: Armentrout (1993); courtesy Gulf Coast SEPM.]]

[[file:sedimentary-basin-analysis_fig4-19.png|thumb|300px|{{figure number|2}}.]]

[[file:sedimentary-basin-analysis_fig4-19.png|thumb|300px|{{figure number|2}}Seismic reflection profile from the East Breaks field area illustrating both clinoform and parallel reflection patterns in late Pleistocene sediments immediately below the sea floor (between two sets of bold arrows). Modified from Armentrout (1993); courtesy Gulf Coast SEPM.]]

The seismic reflection profile below is from the High Island South Addition area, GOM basin, [[distance::20 mi]] east of the East Breaks shelf-margin delta. It illustrates the vertical stacking of seven depositional sequences within a fault-bounded salt-withdrawal basin. Down arrows at the inflection point of each clinoform identify the top of the clinoform of each sequence. In general, each cycle consists of (1) a thick basinal package of relatively discontinuous, variable-amplitude, hummocky reflections that grade upward into (2) parallel, continuous, uniform amplitude reflections, overlain by (3) a [[Depocenter#Sediment_supply_rate_and_facies_patterns|prograding]] clinoform that downlaps the underlying facies. Each clinoform is interpreted as a shelf-margin delta prograding into this outer-shelf to upper-slope fault-bounded basin as shown by the presentday sea floor profile. The seven prograding clinoforms are mapped into a nearby well and are correlated with two-cycle charts ([[:file:sedimentary-basin-analysis_fig4-25.png|Figure 1]]). Cycle 1 of this figure correlates with the clinoform package of [[:file:sedimentary-basin-analysis_fig4-19.png|Figure 2]].

The seismic reflection profile below is from the High Island South Addition area, GOM basin, [[distance::20 mi]] east of the East Breaks shelf-margin delta. It illustrates the vertical stacking of seven depositional sequences within a fault-bounded salt-withdrawal basin. Down arrows at the inflection point of each clinoform identify the top of the clinoform of each sequence. In general, each cycle consists of (1) a thick basinal package of relatively discontinuous, variable-amplitude, hummocky reflections that grade upward into (2) parallel, continuous, uniform amplitude reflections, overlain by (3) a [[Depocenter#Sediment_supply_rate_and_facies_patterns|prograding]] clinoform that downlaps the underlying facies. Each clinoform is interpreted as a shelf-margin delta prograding into this outer-shelf to upper-slope fault-bounded basin as shown by the presentday sea floor profile. The seven prograding clinoforms are mapped into a nearby well and are correlated with two-cycle charts ([[:file:sedimentary-basin-analysis_fig4-25.png|Figure 1]]). Cycle 1 of this figure correlates with the clinoform package of [[:file:sedimentary-basin-analysis_fig4-19.png|Figure 2]].