Abstract

Three major framework facies (algal pavement, coral heads, and branching corals) show varying degrees of cementation. The widest distribution and greatest variety of submarine cements occur within those facies or subfacies that have extensive encrustation by coralline algae; these are found beneath the windward margin and within the patch reef drilled. Both Mg calcite and aragonite cements exhibit diverse fabrics and textures. Mg calcite in the dominant cement and is present as both an interskeletal and intraskeletal infill, whereas aragonite cement is exclusively intraskeletal. Interskeletal cements are only developed within those facies capable of trapping significant quantities of fine-grained internal sediment. Lithified crusts, with either a laminated or columnar morphology, are a prominent cavity infill within many of the reef framework facies. Organic influence during formation. Peloids, which are the major component of the lithified crusts as well as many other cavity infillings, are a particular form of Mg calcite micrite and have nucleated within the interstitial waters of the reef. Microcrystalline rim cements around the peloids have often cemented them into a coherent mass that resembles detrital lime mudstones.--Modified journal abstract.

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