Chemical variations among L-chondrites. IV - Analyses, with petrographic notes, of 13 L-group and 3 LL-group chondrites

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Chondrites, Meteoritic Composition, Petrography, Chemical Composition, Iron, Magnesium, Melting, Silicon, Sulfur

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Procedures are reviewed for selecting, preparing and analyzing meteorite samples, present new analyses of 16 ordinary chondrites, and discuss variations of Fe, S and Si in the L-group. A tendency for Fe/Mg, S/Mg and Si/Mg to be low in L chondrites of facies d to f testifies that post-metamorphic shock melting played a significant role in the chemical diversification of the L-group. However, these ratios also vary widely and sympathetically in melt-free chondrites, indicating that much of the L-group's chemical variation arose prior to thermal metamorphism and is in that sense primary. If all L chondrites come from one parent body, type-correlated chemical trends suggest: (1) that the body had a tradiational 'onion skin' structure, with metamorphic intensity increasing with depth; and (2) that it formed from material that became more homogeneous, slightly poorer in iron, and significantly richer in sulfur as accretion proceeded.

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