Moderately volatile siderophiles in ordinary chondrites

Details Moderately volatile siderophiles in ordinary chondrites Moderately volatile siderophiles in ordinary chondrites

Sep 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979e%26psl..44..397r&link_type=abstract

Earth and Planetary Science Letters, vol. 44, no. 3, Sept. 1979, p. 397-408. Research supported by the Deutsche Forschungsgemei

Mathematics

Logic

2

Abundance, Antimony, Chondrites, Copper, Gallium, Germanium, Mineralogy, Oxidation, Petrology, Silicates, Tables (Data), Volatility, Meteorites, Chondrites, Siderophile Elements, Volatile Elements, Metals, Silicates, Fractionation, Abundance, Germanium, Copper, Gallium, Data, Magnetic Properties, Oxidation, Condensation, Analysis, Solid Solution, Antimony, Chronology, Matrix, Temperatures, Element Ratios, L-Group Chondrites, Ll-Group Chondrites, H-Group Chondrites

Scientific paper

The concentration of Ga, Ge, Cu, and Sb in magnetic and nonmagnetic portions of ordinary chondrites is discussed. Ge and Sb are mostly siderophilic, but Ga is strongly lithophilic in unequilibrated chondrites. From 25 to 50% of the Cu is found in the non-magnetic fraction, but there is no correlation between Cu content and petrologic type. Ge, which is the most volatile of the four elements, is more abundant in H than in L and LL chondrites, indicating that it was fractionated by the metal-silicate fractionation process. Nebular oxidation processes can be responsible for the behavior of Ga if this element was in oxidized form when loss of metal occurred, but cannot explain the Cu and Sb results which are predicted to condense as metals and accrete in metallic form. It is possible that Cu and Sb did not form solid solutions with metallic Ni-Fe upon condensation until after the separation of metal from silicates took place.

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