GEOCHEMICAL BALANCE OF CA AND MG DURING SEDIMENTATION. PART 1. BALANCE OF FLUXES IN THE GEOCHEMICAL CYCLE OF CA, MG, AND CO2

Abstract

Data on the carbonate abundance in the Earth’s sedimentary shell and, respectively, the average composition of the latter indicate an excess of Ca, i.e., its amount in magmatic rocks feeding the sedimentary process is significantly lower than that in the average composition of sedimentary rocks. Moreover, a strange carbonate deficiency was noted in Precambrian metasediments.