我国南海海盆一块锰壳层的生长速度及某些地球化学特征
RATE OF ACCRETION OF MANGANESE CRUST FROM THE SOUTH CHINA SEA BASIN AND ITS GEOCHEMICAL CHARACTERISTICS
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摘要: 锰结核是海洋中重要矿产资源,它的成因至今众说纷纭。测定锰结核（包括锰壳层）的生长速度,应用放射性元素及其同位素研究锰结核与周围环境的关系,对于探讨锰结核的成因十分重要。铀系方法,包括230Th过、231Pa过、234U过230Th过/232Th,在测定锰结核的生长Abstract: characteristics of the studied area. Excess 230Th concentrations in the uppermost layer(1mm) of the crust indicate an upper limit of growth rate of 4 .1 mm/l08yr. This rate of accreti一on for the crust is similar to that for 6A nodule sample from the easter part of the Pacific Ocean.Uniform and low rates of the crust growth from the South China Sea and th nodules forom various oceanic basins suggest that a similar controlling mechanism may take place during their formations in the marine environment.
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