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REE geochemistry has been studied of sea-floor sediments of the continental shelf of theEast China Sea. The average content of RE_2O_3 is estimated at 175 ppm based on 68 sedimentsamples from the continental shelf. The absolute concentrations of Y and La-Lu in the sedi-ments are shown in Table 3. The REE distribution patterns in the sediments demonstrate adistinct depletion in Eu and a negative slope. It is considered that the fragments of Mesozoicintermediate-acid igneous rocks widely distributed in southeastern China are the main sourceof REE in sea-floor sediments of the East China Sea continental shelf.
REE geochemistry has been studied of sea-floor sediments of the continental shelf of the East China Sea. The average content of RE_2O_3 is estimated at 175 ppm based on 68 sedimentsamples from the continental shelf. The absolute concentrations of Y and La-Lu in the sediment -ments are shown in Table 3. The REE distribution patterns in the sediments demonstrate adistinct depletion in Eu and a negative slope. It is considered that the fragments of Mesozoic intermediate-acid igneous rocks widely distributed in southeastern China are the main source of REE in sea- floor sediments of the East China Sea continental shelf.