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Thermal metamorphism of primitive meteorites. VIII - Noble gases, carbon and sulfur in Allende /C3/ meteorite heated at 400-1000 CNoble gases, C and S, are lost from Allende samples heated for 1 week at temperatures of 400-1000 C in a low pressure environment. In the extreme, losses of He-3 and He-4 are about 100 x while for C, S and Ne, Ar and Kr isotopes and Xe-132 these are less than or equal to 10 x. Except for He, these losses are less severe than those of Bi or Tl from samples heated in the same runs. Significant He, Ne and Ar isotopic fractionation during heating indicates preferential outgassing of specific reservoirs. Next to He, Ar-40 is the most labile of those species considered here but still less so than Bi or Tl. L-group (but not H- or LL-group) chondrites may have lost mobile elements like Tl while being outgassed after late impact-associated heating. A less likely alternative involving a collateral relation between condensation conditions and depth in a parent object may also explain the L-group trend.
Document ID
19790046636
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Herzog, G. F.
(Max-Planck-Institut fuer Kernphysik, Heidelberg, West Germany; Rutgers University New Brunswick, N.J., United States)
Gibson, E. K., Jr.
(NASA Johnson Space Center Geochemistry Branch, Houston Tex., United States)
Lipschutz, M. E.
(Purdue University West Lafayette, Ind., United States)
Date Acquired
August 9, 2013
Publication Date
March 1, 1979
Publication Information
Publication: Geochimica et Cosmochimica Acta
Volume: 43
Subject Category
Lunar And Planetary Exploration
Accession Number
79A30649
Funding Number(s)
CONTRACT_GRANT: NGL-15-005-140
Distribution Limits
Public
Copyright
Other

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