Figure 6 Distribution of total REE and degree of fractionation in samples with and without major fractions of illite or calcite.
Extrapolating these results to the field scale, suggests that the much slower than expected copper release at the site is due to fractions of waste rock with very low sulphide content, fractions with significant amounts of calcite remaining, and slower weathering rates due to lower temperature, larger particle size and lower oxygen content.
In analogy to Sr incorporation, Ca/Ca fractionation during precipitation of calcite is weakly influenced by ionic strength/salinity too.
The petrophysical/petrological properties for the Ferron sandstone are bulk porosity, fluid permeability and volume fractions of quartz, clay, feldspar and calcite; for the Ellenburger carbonate, they are bulk porosity, vertical permeability, horizontal permeability, maximum permeability, grain density and bulk density.
With every growth step, a decrease in the volume fraction of liquid (fl_t) takes place due to overgrowth of calcite grains.
The strong correlation between Sr partitioning and Ca isotope fractionation in calcite can be used to reveal the solid composition of calcite, i.e., Ca/Ca ratio in calcite can be estimated from Sr/Ca ratio and vice versa, if reasonable assumptions of the aqueous Sr/Ca ratio or Ca isotopic composition can be made.
The results showed that the average mass fractions of dissolved inorganic carbon (DIC) initially from calcite dissolution and C3 and C4 organic materials in the groundwater were 46.4%, 18.5%, and 35.1%, respectively.
Trilobite eyes were made of calcite, the same abundant mineral in the white cliffs of Dover.
Everything is preserved by the thinnest layer of calcite from the water oozing out of limestone over the millennia.
Most limestone is composed of calcite, which is the low-temperature form of calcium carbonate.
