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Holocene Previous HitSystemsNext Hit Previous HitTractsNext Hit on Carbonate Platforms

Wolfgang Schlager and Paul Enos

We have taken an actualistic approach to characterize the facies of carbonate Previous HitsystemsNext Hit Previous HittractsNext Hit. On many Holocene carbonate platforms the three basic Previous HitsystemsNext Hit Previous HittractsNext Hit currently are forming side by side. The Bahamas may serve as an example for the combined effects of eustasy, sediment supply and topography on Previous HitsystemsNext Hit Previous HittractsNext Hit. Parts of the windward margins of the Bahama platforms still rise above Previous HitseaNext Hit Previous HitlevelNext Hit. These islands restrict modern sedimentation to a narrow shelf that abuts with a Previous HitseaNext Hit cliff on the old highstand deposits. These shelves are analogues of lowstand Previous HittractsNext Hit. They are covered by reefs and skeletal sands. Most of the flooded parts of the Bahama platforms represent transgressive Previous HitsystemsNext Hit Previous HittractsNext Hit: the sediment body is thin and low in mud; the succession deepens upward; hardgrounds an patch reefs are common, barrier reefs are discontinuous. Oolite shoals have wide channels and extend far into the lagoons. In some areas, sedimentation has outpaced Previous HitseaNext Hit-Previous HitlevelNext Hit rise and produced a sediment body with the characteristics of a highstand Previous HitsystemsTop tract: it progrades seaward, the facies succession shoals upward, often terminating with tidal or terrestrial deposits; oolite shoals have broad crests and narrow channels.

AAPG Search and Discover Article #91019©1996 AAPG Convention and Exhibition 19-22 May 1996, San Diego, California