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6. Condensation and/or Metamorphism: Genesis of E- and L-Group Chondrites from Studies on Artificially Heated Primitive Congeners

Published online by Cambridge University Press:  12 April 2016

M. E. Lipschutz  and
M. Ikramuddin

Abstract

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Primitive chondrites heated for one week under conditions reasonable for early solar system objects readily lose volatile/mobile trace elements, e.g., Ag, Bi, Cs, Ga, In, Se, Te, Tl and Zn. Trace element contents decrease by 10-100x progressively with temperature up to 1000° C; apparent activation energies calculated from these data suggest bonding differences between chondrites. Comparison of data for E3-6 chondrites and heated Abee (E4) indicates that volatile/mobile trace elements in E-group chondrites reflect metamorphic loss from a parent object; prior nebular cosmochemical fractionation modified non-volatile element contents. Apparently L3-6 chondrites escaped such open-system metamorphism. Information on nebular condensation process(es) may be gained from L-group compositional data; only nonvolatile elements in E-group chondrites should be used for this purpose, however.

Type
Part VI. Primitive Meteorites
Information
International Astronomical Union Colloquium , Volume 39: Comets, Asteroids, Meteorites: Interrelations, Evolution and Origins , December 1977 , pp. 375 - 383
Copyright
Copyright © A.H. Delsemme 1977

References

Anders, E. 1964, Space Sci. Rev. 3, 583.Google Scholar
Anders, E., Higuchi, H., Canapathy, R., and Morgan, J. W. 1976, Geochim. Cosmnchim. Acta, in press.Google Scholar
Binz, C. M., Kurimoto, R. K., and Lipschutz, M. E. 1974, Geochim. Cosmochim. Acta, 38, 1579.CrossRefGoogle Scholar
Binz, C. M., Ikramuddin, M., Rey, P., and Lipschutz, M. E. 1976, Geochim. Cosmochim. Acta, 40, 59.Google Scholar
Blander, M. 1975, Geochim. Cosmochim. Acta, 39, 1315.Google Scholar
Dodd, R. T. 1969, Geochim. Cosmochim. Acta, 33, 161.CrossRefGoogle Scholar
Fechtig, H., Centner, W., and Lammerzahl, P. 1963, Geochim. Cosmochim, Acta, 27, 1149.Google Scholar
Ikramuddin, M., Binz, C. M., and l.ipschutz, M. E. 1976a, Geochim. Cosmochim. Acta, 40, 133.Google Scholar
Ikramuddin, M., Binz, C. M., and l.ipschutz, M. E. 1976b, Geochim. Cosmochim. Acta, submitted.Google Scholar
Ikramuddin, M., Binz, C. M., and l.ipschutz, M. E. 1976c, Proc. Seventh Lunar Sci. Conf., in press.Google Scholar
Ikramuddin, M., and Lipschutz, M. E. 1975, Geochim. Cosmochim. Acta, 39, 363.CrossRefGoogle Scholar
Ikramuddin, M., Lipschutz, M. E., and Van Schmus, W. R. 1975, Nature, 253, 703.Google Scholar
Larimer, J. W. 1973, Geochim. Cosmochim. Acta, 37, 1603.CrossRefGoogle Scholar
Shaw, D. M., and Harmon, R. S. 1975, Meteoritics, 10, 253.Google Scholar
Van Schmus, W. R., and Wood, J. A. 1967, Geochim. Cosmochim. Acta, 31, 747.Google Scholar
Wasson, J. T. 1972, Rev. Geophys. Space Phys., 10, 711.Google Scholar
Wasson, J. T. 1974, Meteorites, Springer-Verlag.Google Scholar