Secular variation in the isotopic composition of Nd in Tethys seawater

Details Secular variation in the isotopic composition of Nd in Tethys seawater Secular variation in the isotopic composition of Nd in Tethys seawater

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.3139s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 54, Issue 11, pp.3139-3145

Mathematics

Logic

6

Scientific paper

This preliminary Nd isotopic study of authigenic glauconites that are mineralogically, chemically, isotopically (Rb-Sr, K-Ar), and stratigraphically well-characterized suggests that these minerals can be used to determine the Nd isotopic evolution of ancient ocean water. Generally, glauconites indicate the same evolutionary history of Nd in Tethys seawater as published data for marine phosphates (E.G., fish remains), Mn ores, and fossil debris. The initial Nd values define a smooth curve with lowest values of -9 to -10 for the Cretaceous and lower Tertiary. Highest Nd values have been found for 150-200 Ma Tethys seawater that was influenced by both a nonradiogenic continental component and a greater input of young, mantle-derived material.

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