Thermomagnetic analysis of meteorites, 2. C2 chondrites |
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| Authors: | DE Watson EE Larson JM Herndon MW Rowe |
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| Institution: | U.S. Geological Survey, Denver, Colo. USA;Cooperative Institute for Research in Environmental Sciences, University of Colorado/NOAA, Boulder, Colo. USA;Department of Chemistry, Texas A & M University, College Station, Texas USA |
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| Abstract: | Samples of all eighteen of the known C2 chondrites have been analyzed thermomagnetically. For eleven of these, initial Fe3O4 content is low (generally <1%) and theJs-T curves are irreversible. The heating curves show variable greater (up to 10 times) than it is initially. This behavior is attributed to the production of magnetite from a thermally unstable phase — apparently FeS. Four of the remaining seven C2 chondrites contain Fe3O4 as the only significant magnetic phase: initial magnetite contents range from 4 to 13%. The remaining three C2 chondrites contain iron or nickel-iron in addition to Fe3O4. These seven C2 chondrites show little evidence of the breakdown of a thermally unstable phase. |
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