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A new partial substitution mechanism of CO 2−3 /CO3OH3− and SiO 4−4 for the PO 3−4 group in hydroxyapatite from the Kaiserstuhl alkaline complex (SW-Germany)

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Abstract

Based on a detailed mineral-chemical investigation of apatite from a series of carbonatites and associated silicate volcanic rocks of the Kaiserstuhl tertiary alkaline volcanic centre, evidence for a new substitution mechanism was found within the hydroxyapatite group, yielding the following simplified formula: (Ca, Sr, LREE)10(SiO4)x(CO3)x(PO4)6−2x(OH, F)2 with 0<x<1.2 LREE represents light rare-earth elements such as Ce, La, and Nd. Other elements were detected included Cl, S and traces of Mg, Al, K, Fe, Mn, and Th, however they have no effect on the substitution mechanism found. F is present in varying amounts, although well under half of the total possible halogen content (3.7 wt.% F), and shows a distinct antipathetic concentration correlation with REE and Si (and in turn with C). Charge balance is generally maintained by the coupled substitution of CO 2−3 and SiO 4−4 for PO 3−4 ; however, excess charge may be subsequently adjusted by CO3OH3− partly accompanied by the REE in the Ca site.

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Authors and Affiliations

  1. Institut für Mineralogie und Petrographie (IMP), ETHZ, 8092, Zürich, Switzerland

    J. Sommerauer

  2. Mineralogisch-petrographisches Institut, Universität Freiburg i.Br., Federal Republic of Germany

    K. Katz-Lehnert

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  1. J. Sommerauer
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  2. K. Katz-Lehnert
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Sommerauer, J., Katz-Lehnert, K. A new partial substitution mechanism of CO 2−3 /CO3OH3− and SiO 4−4 for the PO 3−4 group in hydroxyapatite from the Kaiserstuhl alkaline complex (SW-Germany). Contr. Mineral. and Petrol. 91, 360–368 (1985). https://doi.org/10.1007/BF00374692

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