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Using seismic-reflection data and ODP drilling results collected from Broken Ridge we examine the stratigraphic response of a carbonate platform to relative sea-level changes. Interpretation of the seismic-reflection and drilling data indicates the following stratigraphic response of the platform to relative sea-level changes: prograding clinoforms comprising lower Maestrichtian to middle Eocene limestones and chalks were deposited during a long-term relative sea-level rise. High productivity allowed the carbonate sediment to prograde north into the basin during the rise. Onlapping sequences consisting of carbonate detritus were deposited along the northern slope of Broken Ridge in response to the middle Eocene rift-induced relative sea-level fall. The carbonate strata on Broken Ridge were uplifted to at least wave base during middle Eocene time and consequently eroded. The carbonate detritus was transported north into the basin and onlaps the preexisting slope of Broken Ridge. We propose that the stratigraphic response of Broken Ridge to the middle Eocene relative sea-level fall is consistent with stratigraphic predictions based on terrigenous margins. However, during a relative sea-level rise, biogenic carbonate production may allow carbonate sediment to prograde basinward despite the fact that water depths are increasing. Stratigraphic models based on terrigenous margins do not account for the increase in sediment supply along carbonate margins during a relative sea-level rise and thus require minor modification in order to predict the development of the prograding clinoforms.

Stratigraphic Response of Carbonate Platforms and Terrigenous Margins to Relative Sea Level Changes: Are They Really That Different?