Mathematics – Logic
Scientific paper
Oct 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977e%26psl..36..372r&link_type=abstract
Earth and Planetary Science Letters, Volume 36, Issue 3, p. 372-380.
Mathematics
Logic
4
Scientific paper
In ordinary chondrites tungsten displays both lithophile and siderophile characteristics. Its concentration in the metal phase is positively correlated with petrologic type, and with the distribution coefficient KD = W in metal/W in silicates plus troilite. The oxidation-reduction reactions involved are temperature-dependent and the recrystallization temperature recorded on the basis of the partition of W between coexisting metal and silicate plus troilite fractions are 950° +/- 100°C for equilibrated chondrites (types 5 and 6), and 800° +/- 50°C for type 4, while Shaw (L7) records the highest recrystallization temperature (>1200°C). The different metallic content of the three groups of ordinary chondrites has been attributed to a metal-silicate fractionation process. Such a process appears to have fractionated W and Ir, but not W and Fe as these elements were partly oxidized when the fractionation process took place.
Cendales Miguel
Rambaldi Ermanno R.
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