Excess crustal calcium problem
Ricardo M. Pytkowicz
    Geochemical Journal, Vol. 13, No. 1, P. 15-17, 1979
ABSTRACT
     RONOV and YAROSHEVSKY (1969) observed the abnormally high calcium content of the earth crust and LOWENGART (1975) explained it as resulting from exchange between oceanic magnesium and mantle calcium. An alternate explanation is presented, namely, that the excess calcium results from the conversion of plagioclase feldspars into carbonates. 
 
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