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7462293 
Journal Article 
STRUCTURAL ENVIRONMENT OF ZR IN 2 INOSILICATES FROM CAMEROON - MINERALOGICAL AND GEOCHEMICAL IMPLICATIONS 
Farges, F; Brown, GE; Velde, D 
1994 
Yes 
American Mineralogist
ISSN: 0003-004X 
79 
9-10 
838-847 
English 
WOS:A1994PM15900005 
The structural environments of Zr in a Na- and Fe2+-rich clinopyroxene and an arfvedsonitic amphibole from a phonolite of the Rumpi Hills volcanic complex were examined using XAFS spectroscopy at the ZrK edge. The local environment of Zr in these Na- and Fe2+-rich inosilicates is like that observed in Zr-bearing garnets and Zr-bearing silicate glasses, in which [6]Zr is favored by the presence of nonbridging O atoms, to which Zr preferentially bonds. The similarity of the short-range structural environment of Zr in silicate melts and in [6]Zr-, Na-, and Fe2+-bearing inosilicates may explain why this normally incompatible trace element behaved compatibly during the crystallization of the phonolites of the Rumpi Hills volcanic complex, in which Na- and Fe2+-rich inosilicates are found. -from Authors 
amphibole; clinopyroxene; crystal chemistry; crystal structure; Cameroon; Rumpi Hills; Geochemistry; Mineralogy; Silicates; Structure (composition); Substitution reactions; Trace elements; X ray spectroscopy; Inosilicates; Structural environment; X ray absorption fine structure spectroscopy; Zirconium