Changes

==GOM basin example==

==GOM basin example==

[[file:sedimentary-basin-analysis_fig4-21.png|thumb|{{figure number|1}}. Copyright: Armentrout (1993, <ref name=ch04r9 />); courtesy Gulf Coast SEPM and Geological Society of London.]]

[[file:sedimentary-basin-analysis_fig4-25.png|thumb|{{figure number|1}}Correlation of the third-order eustatic curve of Haq et al.<ref name=ch04r43 /> and the oxygen isotope curve of Williams and Trainor<ref name=ch04r113 /> with seven prograding clinoform intervals from the High Island South Addition in the GOM basin. Copyright: Armentrout;<ref name=ch04r9 /> courtesy Gulf Coast SEPM and Geological Society of London.]]

[[:file:sedimentary-basin-analysis_fig4-21.png|Figure 1]] shows the correlation of the third-order eustatic curve of Haq et al.<ref name=ch04r43 /> and the oxygen isotope curve of Williams and Trainor<ref name=ch04r113>Williams, D., F., Trainor, D., M., 1987, Integrated chemical stratigraphy of deep-water frontier areas of the northern Gulf of Mexico: Proceedings, Gulf Coast Section SEPM 8th Annual Research conference, p. 151–158.</ref> with seven prograding clinoform intervals from the High Island South Addition in the GOM basin (see Figure 4-21). The correlations were established using the extinction events of the benthic foraminifera ''Hyalinea balthica (Hyal B)'' and ''Trimosina denticulata (Trim A)'' and the present-day sea floor as chronostratigraphic data. Six of the observed depositional cycles occur during the Tejas supersequence B 3.10 (0.8-0.0 Ma) third-order cycle of Haq et al.<ref name=ch04r43 />). This correlation suggests that the local cycles are fourth-order depositional cycles with a duration of approximately 130,000 years each.<ref name=ch04r70 />

 

[[:file:sedimentary-basin-analysis_fig4-25.png|Figure 1]] shows the correlation of the third-order eustatic curve of Haq et al.<ref name=ch04r43 /> and the oxygen isotope curve of Williams and Trainor<ref name=ch04r113>Williams, D., F., Trainor, D., M., 1987, Integrated chemical stratigraphy of deep-water frontier areas of the northern Gulf of Mexico: Proceedings, Gulf Coast Section SEPM 8th Annual Research conference, p. 151–158.</ref> with seven prograding clinoform intervals from the High Island South Addition in the GOM basin (see [[:file:sedimentary-basin-analysis_fig4-21.png|Figure 1]]). The correlations were established using the extinction events of the benthic foraminifera ''Hyalinea balthica (Hyal B)'' and ''Trimosina denticulata (Trim A)'' and the present-day sea floor as chronostratigraphic data. Six of the observed depositional cycles occur during the Tejas supersequence B 3.10 (0.8-0.0 Ma) third-order cycle of Haq et al.<ref name=ch04r43 />). This correlation suggests that the local cycles are fourth-order depositional cycles with a duration of approximately 130,000 years each.<ref name=ch04r70 />

The seven fourth-order cycles occur at approximately the same frequency as the oxygen isotope warm and cold cycles. The oxygen isotope cycles are interpreted as glacial-inter-glacial cycles corresponding with relative high- and lowstands of sea level.<ref name=ch04r113 /> The clinoforms generally correlate with trends in upward enrichment in isotope values, suggesting progradation during onset of glacial climates as a consequence of lowering sea level as continental ice formed.

The seven fourth-order cycles occur at approximately the same frequency as the oxygen isotope warm and cold cycles. The oxygen isotope cycles are interpreted as glacial-inter-glacial cycles corresponding with relative high- and lowstands of sea level.<ref name=ch04r113 /> The clinoforms generally correlate with trends in upward enrichment in isotope values, suggesting progradation during onset of glacial climates as a consequence of lowering sea level as continental ice formed.