Computer Science
Scientific paper
Apr 1966
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1966gecoa..30..375c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 30, Issue 4, pp.375-398
Computer Science
3
Scientific paper
Analyses of forty-six apatites from various igneous and metamorphic environments have shown enrichment relative to the lithosphere in Ce, Y, La and Sr; apatite from many granite pegmatites is also enriched in Mn. These elements appear to be substituting for Ca in the structure. The P position is far less amenable to impurity incorporation and As 5+ and V 5+ seldom substitute to any degree for P 5+ ; this is partly due to environmental and partly to structural control. The ratio of Y to Ce + La is higher and total Ce + La + Y content lower, in pegmatite apatites than in apatite from regional metamorphic and plutonic environments, because of selective incorporation of the Ce-earths in K-felspars and monazite during crystallization of granites and pegmatites and enrichment of the Y-earths in residual solutions. The highest Sr content occurs in apatite from ultrabasic and alkalic rocks. Ba is also enriched in apatite from alkalic complexes and carbonatites.
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