Physics – Geophysics
Scientific paper
Jan 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977e%26psl..33..443b&link_type=abstract
Earth and Planetary Science Letters, Volume 33, Issue 3, p. 443-450.
Physics
Geophysics
5
Scientific paper
Partitioning of Mg-Fe2+ between coexisting olivine and spinel is examined in sixty-eight lherzolite xenoliths that range from relatively undeformed rocks through intermediate varieties to extremely deformed and recrystallized tectonites. The partitioning data is plotted in a two-dimensional diagram whose axes represent (ln KD - 4 × YFe3+SP) and YCrSP. The different textural types can be distinguished from each other with reference to two isotherms (700°C and 1200°C) empirically determined by Evans and Frost. The less deformed rocks fall nearer the 1200°C isotherm, whereas the more deformed rocks fall close to the 700°C isotherm with the intermediate varieties falling in between. The same relationship has been found in the same suite of rocks using the two-pyroxene thermometer. Present address: Department of Geology and Geophysics, University of Minnesota, Minneapolis, Minn. 55455, U.S.A.
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