Chemical fractionations in meteorites--VI. Accretion temperatures of H-, LL- and E-chondrites, from abundance of volatile trace elements

Details Chemical fractionations in meteorites--VI. Accretion temperatures of H-, LL- and E-chondrites, from abundance of volatile trace elements Chemical fractionations in meteorites--VI. Accretion temperatures of H-, LL- and E-chondrites, from abundance of volatile trace elements

Feb 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973gecoa..37..329l&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 37, Issue 2, pp.329-357

Mathematics

Logic

18

Scientific paper

Extending our earlier work on 11 L-chondrites, we have measured 9 volatile elements (Ag, Bi, Cs, In, Rb, Tl, Se, Cd, Zn) by neutron activation analysis in 11 LL- and 10 E-chondrites; the first 6 elements also in 22 H-chondrites. The observed fractionation patterns are consistent with theoretical condensation curves and hence were apparently established during condensation from the solar nebula. Ordinary chondrites seem to have accreted between 420 and 500°K at P 10 -5 atm; enstatite chondrites, at 460 to 520°K and P 5 10 -4 atm. The values for ordinary chondrites agree with O 18 -based temperatures by . et al. (1972) and with other characteristics such as Fe 2+ content, presence of FeS and absence of Fe 3 O 4 . A few detailed trends were noted. Seven of the 54 meteorites seem to contain small amounts of a material enriched in Ag, Bi and especially T1; possibly a late condensate from a region depleted in metal. Silver shows considerable scatter, which suggests inhomogeneous distribution in the meteorites. Xenon correlates with In approximately as expected for equilibrium solubility, with some differences (petrologic type 3; E-chondrites) attributable to mineralogical factors. Meteorites of higher petrologic types are slightly deficient in Xe, probably due to gas losses during metamorphism. Cesium also appears to have been redistributed during metamorphism. Various features of the two-component model are critically examined in the light of the latest evidence. Apparently this model still is an adequate approximation of reality.

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