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The oxidation states of niobium and tantalum in mantle melts

Abstract:

Niobium K-edge and tantalum L III-edge XANES spectra were recorded for silicate glasses quenched from melts equilibrated at oxygen fugacities (in log units relative to the iron-wüstite buffer) ranging from IW+6.7 to IW-4.3 at 1400-1650°C and atmospheric pressure to 1.5GPa. Niobium and tantalum were found to occur exclusively as Nb 5+ and Ta 5+. This suggests that changes in oxidation state do not contribute to the fractionation of Nb from Ta in arc settings or the generation of the hidden Nb-...

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Institution:
University of Oxford
Division:
MPLS
Department:
Earth Sciences
Role:
Author
Journal:
CHEMICAL GEOLOGY More from this journal
Volume:
330
Pages:
228-232
Publication date:
2012-11-10
DOI:
ISSN:
0009-2541
Language:
English
Keywords:
Pubs id:
pubs:354682
UUID:
uuid:b5d8c8a8-d355-4d2c-9d21-568da202f883
Local pid:
pubs:354682
Source identifiers:
354682
Deposit date:
2013-11-16

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