Substitution of tin in cassiterite by tantalum, niobium, tungsten, iron and manganese

Details Substitution of tin in cassiterite by tantalum, niobium, tungsten, iron and manganese Substitution of tin in cassiterite by tantalum, niobium, tungsten, iron and manganese

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.1497m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 52, Issue 6, pp.1497-1503

Physics

4

Scientific paper

The interpretation of (i) the interelement relationships of (Ta + Nb) and W or (Fe + Mn), (ii) Mössbauer spectrometric results on the oxidation state of Fe, and (iii) electron probe microanalysis of cassiterites reveal that coupled substitutions of the type 2 ( Ta , Nb ) 5+ + ( Fe , Mn ) 2+ = 3 Sn 4+ W 6+ + 2 Fe 3+ = 3 Sn 4+ Fe 3+ + OH - = Sn 4+ + O 2- are dominant at least at the temperatures of formation of cassiterite. Additional replacements such as ( Ta , Nb ) 4+ = Sn 4+ cannot be ruled out. Aspects of the structural control on trace element distribution, and maintenance of electroneutrality of the crystal lattice are discussed.

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