Accession Number : ADA304780

Title :   Mineralogical Study of the Seafloor Diagenesis of Carbonate Sediments Near Dry Tortugas, Gulf of Mexico, Using Rietveld Method of Crystal Structure Refinement.

Descriptive Note : Quarterly technical rept. Oct-Dec 95,

Corporate Author : UNIVERSITY OF SOUTHERN MISSISSIPPI STENNIS SPACE CENTER CENTER FOR MARINE SCI ENCE

Personal Author(s) : Furukawa, Yoko

PDF Url : ADA304780

Report Date : 31 DEC 1995

Pagination or Media Count : 15

Abstract : The carbonate sediments from Fort Jefferson National Monument area were studied for mineralogy using X-ray powder diffraction (XRD) in order to evaluate the effects of seafloor diagenesis on sediment structure. Cementation is suggested at the depths of 120 cm and below by the increase in high-Mg/low-Mg calcite ratio within fine-grained matrix. The relative amounts of calcium carbonate phases were determined by the Rietveld crystal structure refinement. Seafloor diagenesis may be significant at the sediment depths which are not affected by bioturbation and storm mixing.

Descriptors :   *SEDIMENTS, *OCEAN BOTTOM, *MINERALOGY, MAGNESIUM, MICROSTRUCTURE, CRYSTAL STRUCTURE, X RAY DIFFRACTION, BOUNDARY LAYER, MOISTURE CONTENT, QUARTZ, CLAY, CALCITE, CALCIUM COMPOUNDS, GEOCHEMISTRY, SEDIMENTATION, SILT, CARBONATES, MEXICO GULF, CARBONATE MINERALS.

Subject Categories : Physical and Dynamic Oceanography
      Geology, Geochemistry and Mineralogy

Distribution Statement : APPROVED FOR PUBLIC RELEASE