Changes

==Seismic facies profile==

==Seismic facies profile==

The figure below is the interpreted seismic facies pattern for part of one seismic reflection profile down the axis of the High Island-East Breaks depocenter.<ref name=ch04r7>Armentrout, J., M., 1991, Paleontological constraints on depositional [[modeling]]: examples of integration of biostratigraphy and seismic stratigraphy, Pliocene–Pleistocene, Gulf of Mexico, in Weimer, P., Link, M., H., eds., Seismic Facies and Sedimentary Processes of Submarine Fans and Turbidite Systems: New York, Springer-Verlag, p. 137–170.</ref> This is the same seismic profile discussed in Figure 4-27.

file:sedimentary-basin-analysis_fig4-29.png|{{figure number|3}}Biofacies maps of the study area in the Gulf of Mexico. After Armentrout<ref name=ch04r7 /><ref name=ch04r9 />). Copyright: Springer-Verlag, Geological Society of London.

 

[[:file:sedimentary-basin-analysis_fig4-36.png|Figure 1]] is the interpreted seismic facies pattern for part of one seismic reflection profile down the axis of the High Island-East Breaks depocenter.<ref name=ch04r7>Armentrout, J., M., 1991, Paleontological constraints on depositional [[modeling]]: examples of integration of biostratigraphy and seismic stratigraphy, Pliocene–Pleistocene, Gulf of Mexico, in Weimer, P., Link, M., H., eds., Seismic Facies and Sedimentary Processes of Submarine Fans and Turbidite Systems: New York, Springer-Verlag, p. 137–170.</ref> This is the same seismic profile discussed in [[:file:sedimentary-basin-analysis_fig4-27.png|Figure 2]].

Each prograding clinoform contains a rotated package of chaotic facies within the upper and steepest part of the clinoform facies and basinward of the tabular facies. The clinoform facies is onlapped by parallel, moderate-amplitude, onlapping reflections of the onlap-fill facies, which are subsequently downlapped onto by the next overlying prograding clinoform. In a broader sense, the drape facies below these clinoforms and the ''Glob N'' datum represent basinal deposits; the clinoform and onlapping-fill facies represent slope deposits; and the overlying tabular facies above the clinoforms and the ''Glob M'' datum represent shelf deposits—all part of a basin-filling succession.

Each prograding clinoform contains a rotated package of chaotic facies within the upper and steepest part of the clinoform facies and basinward of the tabular facies. The clinoform facies is onlapped by parallel, moderate-amplitude, onlapping reflections of the onlap-fill facies, which are subsequently downlapped onto by the next overlying prograding clinoform. In a broader sense, the drape facies below these clinoforms and the ''Glob N'' datum represent basinal deposits; the clinoform and onlapping-fill facies represent slope deposits; and the overlying tabular facies above the clinoforms and the ''Glob M'' datum represent shelf deposits—all part of a basin-filling succession.

Associated foraminiferal biofacies shown in Figures 4-27 and 4-29 support this analysis. The ''Glob alt'' sequence is the fourth clinoform from the right, the fourth-most basinward of five oblique clinoforms that toplap along a common horizon. Superjacent clinoforms show progressively more topset deposition forming sigmoidal clinoforms, suggesting relative rise of sea level (with consistent widespread increase in accommodation space). Observations of seismic facies from a single phase of deposition, such as lowstand or highstand, are recorded on a map and contoured to convey the distribution of each seismic facies (Figures 4-37 and 4-38).

Associated foraminiferal biofacies shown in [[:file:sedimentary-basin-analysis_fig4-27.png|Figure 2]] and [[:file:sedimentary-basin-analysis_fig4-29.png|Figure 3]] support this analysis. The ''Glob alt'' sequence is the fourth clinoform from the right, the fourth-most basinward of five oblique clinoforms that toplap along a common horizon. Superjacent clinoforms show progressively more topset deposition forming sigmoidal clinoforms, suggesting relative rise of sea level (with consistent widespread increase in accommodation space). Observations of seismic facies from a single phase of deposition, such as lowstand or highstand, are recorded on a map and contoured to convey the distribution of each seismic facies ([[:file:sedimentary-basin-analysis_fig4-37.png|Figures 4]] and [[:file:sedimentary-basin-analysis_fig4-38.png|5]]).

 

[[file:sedimentary-basin-analysis_fig4-37.png|thumb|{{figure number|4-37}}See text for explanation.]]

 

[[file:sedimentary-basin-analysis_fig4-38.png|thumb|{{figure number|4-38}}See text for explanation.]]

==Seismic facies map==

==Seismic facies map==

[[file:sedimentary-basin-analysis_fig4-28.png|thumb|{{figure number|4-28}}After Armentrout.<ref name=ch04r7 /> <ref name=ch04r9>Armentrout, J., M., 1996, High-resolution sequence biostratigraphy: examples from the Gulf of Mexico Plio–Pleistocene, in Howell, J., Aiken, J., eds., High Resolution [[Sequence stratigraphy]]: Innovations and Applications: The Geological Society of London Special Publication 104, p. 65–86.</ref> Copyright: Springer-Verlag, Geological Society of London.]]

[[file:sedimentary-basin-analysis_fig4-28.png|thumb|{{figure number|4-28}}After Armentrout.<ref name=ch04r7 /> <ref name=ch04r9>Armentrout, J., M., 1996, High-resolution sequence biostratigraphy: examples from the Gulf of Mexico Plio–Pleistocene, in Howell, J., Aiken, J., eds., High Resolution [[Sequence stratigraphy]]: Innovations and Applications: The Geological Society of London Special Publication 104, p. 65–86.</ref> Copyright: Springer-Verlag, Geological Society of London.]]

[[file:sedimentary-basin-analysis_fig4-36.png|thumb|{{figure number|4-36}}After Armentrout.<ref name=ch04r6>Armentrout, J., M., 1987, Integration of biostratigraphy and seismic stratigraphy: Pliocene–Pleistocene, Gulf of Mexico: Proceedings, Gulf Coast Section SEPM 8th Annual Research Conference, p. 6–14.</ref> Copyright: Gulf Coast SEPM.]]

[[file:sedimentary-basin-analysis_fig4-36.png|thumb|{{figure number|4-36}}After Armentrout.<ref name=ch04r6>Armentrout, J., M., 1987, Integration of biostratigraphy and seismic stratigraphy: Pliocene–Pleistocene, Gulf of Mexico: Proceedings, Gulf Coast Section SEPM 8th Annual Research Conference, p. 6–14.</ref> Copyright: Gulf Coast SEPM.]]