Chemical variability in francolites from Israeli phosphorite macrograins View Full Text


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Article Info

DATE

1982-03

AUTHORS

Shimshon Axelrod, Vera Rohrlich

ABSTRACT

The chemical composition (up to 7 elements) of francolite in 64 samples of Israeli phosphorites from 7 fields was determined. Samples comprising mainly skeletal macrograins contain, on the average, 1.5% less P2O5, than those with other types of macrograins (mostly pelletal). Average CO2 in the skeletal variety is 4%, against 3% elsewhere. There is a strong positive correlation between Na and CO2, and a strong negative one between Mg and P2O5. Of the principal components explaining more than 95% of the chemical variation, the first, which opposes phosphate to carbonate and to sodium, differentiates between types of macrograins; the second, based on calcium and sodium not coupled with carbonate, differentiates between phosphorite fields. This is clearly seen from the graph (Fig. 6) obtained by correspondence-factor analysis. The difference between skeletal and other magrograins could be due to origin or to diagenetic changes, which include “francolitisation” of carbonate hydroxyapatite. More... »

PAGES

1-16

References to SciGraph publications

  • 1975-02. Correspondence factor analysis: An outline of its method in MATHEMATICAL GEOSCIENCES
  • Journal

    TITLE

    Mineralium Deposita

    ISSUE

    1

    VOLUME

    17

    Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/bf00206372

    DOI

    http://dx.doi.org/10.1007/bf00206372

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1007174968


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