Accession Number : AD0600898

Title :   MINERALOGY AND GEOCHEMISTRY OF RECENT SEDIMENTS, VIEQUES PASSAGE, PUERTO RICO.

Descriptive Note : Technical rept.

Corporate Author : TEXAS A AND M UNIV COLLEGE STATION

Personal Author(s) : Sommer,Sheldon E. ; Angino,Ernest E. ; Hood,Donald W.

Report Date : MAY 1964

Pagination or Media Count : 65

Abstract : This investigation concerns itself with a study of some of the geochemical changes that fresh recent marine sediments undergo soon after deposition. During the initial stages of diagenesis, the system is essentially an open one where any physical-chemical reaction occurring in the sediments changes the equilibrium. As the pH of the water becomes less alkaline, solution of unstable carbonates tends to occur. After burial of the sediment, metastable carbonates (aragonite and high Mg-calcite) may invert to more stable phases. The result would be a reduction of carbonate-mineral variety with a tendency to concentrate hydrolyzates (perhaps slightly modified) and resistates. The major portion of this study is concerned with the early changes in mineralogy and trace element distribution of recent carbonate sediments. (Author)

Descriptors :   (*PETROLOGY, SEDIMENTATION), (*GEOCHEMISTRY, SEDIMENTATION), (*SEDIMENTATION, PUERTO RICO), (*PUERTO RICO, MARINE GEOLOGY), GEOGRAPHY, OCEANOGRAPHY, GRAPHICS

Distribution Statement : APPROVED FOR PUBLIC RELEASE