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- W2029273841 abstract "Sediment samples were recovered from the central equatorial Pacific Ocean, sectioned at 1-mm intervals, and analyzed for porosity, organic carbon, excess210Pb and CaCO3. Steep porosity gradients were measured in the upper 1 cm of the sediment column with extremely high values observed near the sediment surface. Similarly, particulate organic carbon contents are highest at the sediment surface, decrease sharply in the upper 1 cm, and are relatively constant between 1 and 5 cm. CaCO3 values, on the other hand, are lowest at the sediment surface and increase to a constant value below 5–10 mm depth. At the carbonate ooze sites, excess210Pb is present throughout the upper 5 cm of the sediments suggesting relatively rapid particle mixing rates. However, extremely high excess210Pb activities (> 100 dpm/g) are observed at the sediment surface with sharp gradients present in the upper 1 cm which would suggest slow rates of mixing. This apparent contradiction along with the major features of the CaCO3 and particulate organic carbon profiles can be explained by a particle-selective feeding mechanism in which organic carbon, excess210Pb-enriched particles are preferentially maintained at the sediment surface via ingestion and defecation by benthic organisms." @default.
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- W2029273841 date "1986-02-01" @default.
- W2029273841 modified "2023-10-14" @default.
- W2029273841 title "Fine scale distributions of porosity and particulate excess210Pb, organic carbon and CaCO3 in surface sediments of the deep equatorial Pacific" @default.
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- W2029273841 doi "https://doi.org/10.1016/0012-821x(86)90132-9" @default.
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