Computer Science
Scientific paper
Nov 1971
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971gecoa..35.1121m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 35, Issue 11, pp.1121-1137
Computer Science
9
Scientific paper
The concentrations of Ni and Ir have been determined by neutron activation in a suite of ordinary chondrites for which accurate ferromagnesian-mineral compositional data were available. Although hiatus between the individual groups exist, the trends within the groups are in keeping with the hypothesis that the ordinary chondrites form a continuous fractionation sequence. A significant negative correlation is observed between the abundance of Ni or Ir and the Fe content of the ferromagnesian minerals in the H and L groups, and for Ir in the LL group, as expected if the metal-silicate fractionation and the variation in oxidation states were produced by the same or related processes. The Ir / Ni ratio decreases by a factor of 1.2 between the H and LL groups. This fractionation must have occurred at an early stage in the condensation phase of the solar nebula.
Baedecker Philip A.
Müller Otto
Wasson John T.
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