Geochemical, Mineralogical and Microstructural Study of the Seafloor Diagenesisof Carbonate Sediments in Fort Jefferson National Monument Area

摘要

The carbonate sediments from Fort Jefferson National Monument area are beingstudied for porewater geochemistry, mineralogy, and microfabric in order to evaluate the effects of seafloor diagenesis to the sediment structure. Cementation is suggested at the depths of 120 cm and below by the increase in high-Mg/low-Mg calcite ratio determined by the Rietveld crystal structure refinement. Seafloor diagenesis may be significant at the depths where the effects of bioturbation and storm mixing do not reach. jg p.1.