Accession Number : AD0618599

Title :   REMARKS ON AGE DETERMINATION IN DEEP-SEA SEDIMENTS,

Corporate Author : MIAMI UNIV FLA MARINE LAB

Personal Author(s) : Koczy,F. F.

Report Date : 1963

Pagination or Media Count : 16

Abstract : The general problem of age determination in ocean sediments is reviewed with special regard to geochemical processes in the ocean. Specifically, the equilibrium condition for chemisorption on sediment particles is discussed under the assumption that the equilibrium constant does not change between sediment and sea water, i.e. between systems of extremely high and low sediment concentration. Included is the problem of the geochemical changes of the speciation of adsorbed nuclides with reference to the solubility of the nuclides in acid solutions. The validity of one of the generally used methods for age determination which is based on the assumption of a constant concentration in sea water over geological time is investigated. It is demonstrated that the uranium/thorium ratio in sea water may change with time. Consideration is given to the conditions under which the ionium/thorium ratio may be utilized for determination of age and, consequently, for the determination of the rate of sedimentation. (Author)

Descriptors :   (*MARINE GEOLOGY, SEDIMENTATION), (*SEDIMENTATION, GEOLOGIC AGE DETERMINATION), (*GEOLOGIC AGE DETERMINATION, SEDIMENTATION), DETERMINATION, OCEANOGRAPHY, OCEAN BOTTOM SAMPLING, CHEMICAL ANALYSIS, THORIUM, URANIUM, SEA WATER

Distribution Statement : APPROVED FOR PUBLIC RELEASE