Changes

==Greenhouse vs. icehouse times==

==Greenhouse vs. icehouse times==

[[file:predicting-reservoir-system-quality-and-performance_fig9-80.png|thumb|{{figure number|1}}. Copyright: Read, 1995; courtesy SEPM.]]

[[file:predicting-reservoir-system-quality-and-performance_fig9-80.png|thumb|{{figure number|1}}From Read.<ref name=ch09r49>Read, J., F., 1995, Overview of carbonate platform sequences, cycle stratigraphy and reservoirs in greenhouse and ice-house worlds, in Read, J., F., Kerans, C., Webber, L., J., Sarg, J., F., Wright, F., M., eds., Milankovitch Sea-level Changes, Cycles, and Reservoirs on Carbonate Platforms in Greenhouse and Ice-house Worlds: SEPM Short Course 35, 183 p. Good summary of concepts of climatic effect on sea level cycles, carbonate deposition, and reservoir development.</ref> Courtesy SEPM.]]

The chart in [[:file:predicting-reservoir-system-quality-and-performance_fig9-80.png|Figure 1]] shows periods of icehouse and greenhouse conditions. Also shown are age and paleolatitudes of ice-rafted deposits (bar chart), net climate forcing CO₂+ solar luminosity (upper curved line), and the Vail sea level curve (lower curved line).

The chart in [[:file:predicting-reservoir-system-quality-and-performance_fig9-80.png|Figure 1]] shows periods of icehouse and greenhouse conditions. Also shown are age and paleolatitudes of ice-rafted deposits (bar chart), net climate forcing CO₂+ solar luminosity (upper curved line), and the Vail sea level curve (lower curved line).

==Sedimentation rate and climate==

==Sedimentation rate and climate==

Light is a critical element of carbonate sedimentation. The photic zone in tropical carbonate settings is only 20–30 m. This is contrasted to cooler water carbonate settings where the photic zone extends to [[length::100 m]] or deeper. Tropical carbonate faunal assemblages strongly depend on light, which is why sedimentation rates below [[length::10 m]] water depth drop rapidly. Carbonate-producing assemblages of temperate zones do not have a strong light dependence; hence, the sedimentation rate, although lower, is constant from the surface to more than [[length::100 m]] water depth (Read, 1996).

Light is a critical element of carbonate sedimentation. The photic zone in tropical carbonate settings is only 20–30 m. This is contrasted to cooler water carbonate settings where the photic zone extends to [[length::100 m]] or deeper. Tropical carbonate faunal assemblages strongly depend on light, which is why sedimentation rates below [[length::10 m]] water depth drop rapidly. Carbonate-producing assemblages of temperate zones do not have a strong light dependence; hence, the sedimentation rate, although lower, is constant from the surface to more than [[length::100 m]] water depth.<ref name=ch09r49 />

The table below contrasts features of tropical carbonate settings with temperate carbonate settings.

The table below contrasts features of tropical carbonate settings with temperate carbonate settings.