Other
Scientific paper
May 1965
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1965gecoa..29..361k&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 29, Issue 5, pp.361-371
Other
6
Scientific paper
In 45 rock-forming silicate minerals, after removal of apatite by HNO 3 dissolution, the phosphorus replacing silicon isomorphously was determined. On the average between 0.2-220 ppm P were found, amounting to about 1-10 P-ions per 10 4 SiO 4 -tetrahedra. The maximum content was found in a garnet with 560 ppm P. This amounts to 28 P-ions per 10 4 SiO 4 -tetrahedra. The more condensed a (Si,Al)O 4 -tetrahedral association, the less silicon is replaced by phosphorus. In general the most phosphorus is contained in neso-, the least in tektosilicates. The stronger covalency of the phosphorus bond is the main cause of this behavior. Another important factor regulating the amount of P-replacement is the equilibrium between the apatite always present and the coexisting silicate minerals. In igneous and metamorphic rocks, on the average 2-10 per cent of the total phosphorus is contributed by the camouflaged replacement of phosphorus in the silicates. Sometimes this can amount to as much as 25-30 per cent.
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