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FERRIC IRON IN MANTLE-DERIVED GARNETS - IMPLICATIONS FOR THERMOBAROMETRY AND FOR THE OXIDATION-STATE OF THE MANTLE

Abstract:

The oxidation state of a mantle assemblage may be defined by heterogeneous reactions between oxygen and iron-bearing minerals. In spinel lherzolites, the presence of Fe3+ in spinel allows use of the assemblage olivine-orthopyroxene-spinel to define fO2 at fixed T and P. As a first step towards establishing an analogous reaction for garnet lherzolites, garnets from mantle-derived xenoliths from South Africa and the USSR have been analyzed with 57Fe Mössbauer spectroscopy at 298 and 77K to dete...

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Publication status:
Published

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Publisher copy:
10.1007/BF00310646

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Institution:
University of Oxford
Department:
Oxford, MPLS, Earth Sciences
Journal:
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
Volume:
104
Issue:
1
Pages:
56-72
Publication date:
1990
DOI:
EISSN:
1432-0967
ISSN:
0010-7999
URN:
uuid:582ae6d8-4f97-4a3e-a53e-d93718164a7a
Source identifiers:
175080
Local pid:
pubs:175080

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