Ionium-Thorium Chronology of Deep-Sea Sediments of the Western North Pacific Ocean

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Science  09 Jun 1961:
Vol. 133, Issue 3467, pp. 1823-1824
DOI: 10.1126/science.133.3467.1823


The rate of deposition of deep-sea deposits collected at the depths of 6215 to 8450 m in the western part of the North Pacific Ocean was estimated by means of the ionium/thorium ratio. The ratio was determined by an alpha-ray spectrometer. Results showed the rate of 0.5 to 0.8 mm/103 yr for the upper 10-cm layer below the sea bottom.