The variable carbon isotopic composition of type 3 ordinary chondrites.

M. M. Grady, Peter K Swart, C. T. Pillinger

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Bulk carbon abundances and 13C values for 10 LL, 7 L and 15 H chondrites of petrologic types 3-6 were obtained by combustion. Carbon in types 4-6 is isotopically lighter (in the range -25 to -30per mille) and less variable than in type 3 (-11 to -28per mille). There is no simple relationship between C concentration and its isotopic composition; several C phases of different isotopic composition may be present in variable proportions. Antarctic meteorites released heavier CO2 during H3PO4 treatment than non-Antarctic finds. The heavier isotopic composition of type 3 meteorites may be due in part to the presence of a graphite-magnetite phase. -B.M.

Original languageEnglish (US)
JournalJournal of Geophysical Research
Volume87
Issue numberSupplement
StatePublished - 1982
Externally publishedYes

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ordinary chondrite
chondrites
Meteorites
isotopic composition
Carbon
meteorites
meteorite
carbon
Chemical analysis
Ferrosoferric Oxide
Graphite
chondrite
graphite
magnetite
proportion
combustion

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Environmental Science(all)

Cite this

The variable carbon isotopic composition of type 3 ordinary chondrites. / Grady, M. M.; Swart, Peter K; Pillinger, C. T.

In: Journal of Geophysical Research, Vol. 87, No. Supplement, 1982.

Research output: Contribution to journalArticle

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AB - Bulk carbon abundances and 13C values for 10 LL, 7 L and 15 H chondrites of petrologic types 3-6 were obtained by combustion. Carbon in types 4-6 is isotopically lighter (in the range -25 to -30per mille) and less variable than in type 3 (-11 to -28per mille). There is no simple relationship between C concentration and its isotopic composition; several C phases of different isotopic composition may be present in variable proportions. Antarctic meteorites released heavier CO2 during H3PO4 treatment than non-Antarctic finds. The heavier isotopic composition of type 3 meteorites may be due in part to the presence of a graphite-magnetite phase. -B.M.

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