Volatile elements in chondrites - Metamorphism or nebular fractionation

Details Volatile elements in chondrites - Metamorphism or nebular fractionation Volatile elements in chondrites - Metamorphism or nebular fractionation

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978gecoa..42.1859t&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 42, Dec. 1978, p. 1859-1869.

Computer Science

3

Chondrites, Metamorphism (Geology), Meteoritic Composition, Nebulae, Volatility, Chemical Elements, Fractionation, Neutron Activation Analysis, Volatile Elements, Chondrites, Heating, Metamorphism, Chemical Composition, Solar Nebula, Fractionation, Allende Meteorite, Shaw Meteorite, Karoonda Meteorite, Coolidge Meteorite, Neutron Activation Analysis, Rare Gases, Condensation, Carbonaceous Chondrites, Enstatite, Krymka Meteorite

Scientific paper

Three of the most highly metamorphosed meteorites of their respective classes, Shaw (LL7), Karoonda (C5), and Coolidge (C4), were analyzed by radiochemical neutron activation analysis for Ag, Au, Bi, Br, Cd, Cs, Ge, In, Ir, Ni, Os, Pd, Rb, Re, Sb, Se, Te, Tl, U, and Zn. Comparison with data by Lipschutz and coworkers (1977) on artificially heated primitive meteorites shows that the natural metamorphism of meteorites cannot have taken place in a system open to volatiles. Shaw, metamorphosed at 1300 C for more than 1 million yr, is less depleted in In, Bi, Ag, Te, Zn, and Tl than Krymka heated at 1000 C for 1 week. Karoonda, metamorphosed at 600 C for many millennia, is less depleted in Bi and Tl than Allende heated at 600 C for 1 week. Data on primordial noble gases also show that the volatile-element patterns of ordinary and carbonaceous chondrites were established by nebular condensation and changed little, if at all, during metamorphism. For enstatite chondrites, the evidence is still incomplete but seems to favor a nebular origin of the volatile pattern.

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