Mathematics – Logic
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978metic..13..165k&link_type=abstract
Meteoritics, vol. 13, June 30, 1978, p. 165-175. Research supported by the Fundacao de Amparo a Pesquisa do Estado do Sao Paulo
Mathematics
Logic
6
Chemical Composition, Chondrites, Meteoritic Composition, Mineralogy, Petrology, Abundance, Brazil, Chemical Analysis, Chromites, Histograms, Iron, Morphology, Nickel, Olivine, Pyroxenes, Quantitative Analysis, X Ray Diffraction
Scientific paper
The Putinga, Rio Grande do Sul chondrite is described and classified as an L6. The mineral composition and some significant ratios of elements are reported, and the reasons for assignment to the L group and to petrologic type 6 are explained. The analysis suggests that maskelynite of oligoclase composition was formed by solid-state shock transformation of previously existing well-crystallized plagioclase at estimated shock pressures of about 250-350 kbar. This finding indicates that recrystallization (formation of well-crystallized oligoclase) preceded shock transformation formation of the maskelynite.
Gomes C. B.
Jarosewich Eugene
Keil Klaus
Lange Dagmar
Roisenberg A.
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