Lithification of Modern Marine Carbonate Sediments at Yellow Bank, Bahamas
Abstract:The mineralogy, chemistry, distribution of grain size, diagenesis, and ages of modern carbonates accumulating on the New Providence Platform, Bahamas, have been studied.
Lithification by aragonite cement is taking place beneath sixteen feet of sea water. These marine sediments have never been exposed to fresh water as determined by virtual absence of low-magnesium calcite and lack of recrystallization of aragonite and high-magnesium calcite. Depth of water and abundance of plant life appear to localize lithification at sites we have termed bioherms.
Significant vertical variations in facies have been found in the modern carbonates that overlie the recrystallized, biosparite, chemically dissolved Pleistocene bedrock. Silt- and clay-sized particles of unconsolidated modern carbonates rest unconformably on the biosparite and increase progressively in size toward the surface. Where modern lithified material is present, rarely is it found deeper than three feet below the water-sediment interface.
Document Type: Research Article
Publication date: 1968-12-01
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