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문덕수,김기현,MOON, DEOK SOO,KIM, KEE HYUN The Korean Society of Oceanography 1995 韓國海洋學會誌 Vol.30 No.4
Rates of the sedimentation and particle mixing have been estimated by applying uranium-series disequilibrium techniques to three sediment cores collected from the korea Deep Ocean Study (KODOS) site between the clarion and Clipperton Fracture Zones (CCFZ) of the Equatorial Pacific. Sedimentation rates based on the profiles of excess /SUP 230/Th activity and /SUP 230/ Th/SUB xs//SUP 232/ Th activity ratios at the southeastern part of the study area were estimated to be in the order of a few millimeters per thousand year, while at the northwestern part a factor of ten lower. Excess activities of /SUP 230/Th and /SUP 230/Th ratios showed intervals of constant values in the upper part of the sediment cores, probably generated by biological particle mixing. A "two-box" advection-diffusion steady state mixing model was employed in order to estimate particle mixing rates in the upper and the lower layers, based on the distribution profiles of excess /SUP 210/Pb activities. Particle mixing coefficients were estimated to be in the order of 10$^1$ cm$^2$/y in the upper layer and 10/SUP -1/-10/SUP 0/ cm$^2$/y in the lower layer.
문덕수,김기현,강정극,MOON, DEOK SOO,KIM, KEE HYUN,KANG, JUNG KEUK The Korean Society of Oceanography 1994 韓國海洋學會誌 Vol.29 No.3
Growth rates of two manganese nodules collected in the Korea Deep Ocean Study (KODOS-89) site in the Clarion-Clipperton Fracture Zones in the central Equatorial Pacific have been estimated by employing uranium-series disequilibrium techniques to investigate the geochemical processes leading to the formation of deep-sea nodules. the growth rates estimated from the profiles of excess /SUP 230/Th activities and ratios of excess /SUP 230/Th to /SUP 232/Th to /SUP 232/Th are in the order of a few millimeters per million years. Growth rates at bottom-side of nodules are 2-3 times faster than those at top-sides. Diagenetic supply of manganese could explain the faster growth at the bottom-side of nodules.