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    Radiometric ages of phosphorites from the west coast of India

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    Mar_Geol_78_161.pdf (346Kb)
    Date
    1987
    Author
    Borole, D.V.
    Rajagopalan, G.
    Somayajulu, B.L.K.
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    Abstract
    Four algal carbonate nodules with approx 1 mm thick phosphorite coatings were dated, by the 230Th/234U and three of the carbonates by 14C methods. All ages (5.8-13.9 k.y) are in satisfactory agreement indicating that phosphorite deposition started soon after the carbonate nodule formation. The U, Th concentrations and isotopic ratios as well as the U/P weight ratios of the phosphorite coatings are in good agreement with those from other regions of the world
    URI
    http://drs.nio.org/drs/handle/2264/6096
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