Mathematics – Logic
Scientific paper
Mar 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984natur.308..257s&link_type=abstract
Nature (ISSN 0028-0836), vol. 308, March 15, 1984, p. 257-259. Research supported by the University of Arkansas.
Mathematics
Logic
16
Chondrites, Enstatite, Evolution (Development), Metamorphism (Geology), Meteoritic Composition, Abundance, Chemical Composition, Mineralogy, Petrology, Meteorites, Chondrites, El Chondrites, Classification, Enstatites, Description, Composition, Petrology, Metamorphism, Antarctic Meteorites, Reckling Peak Meteorites, Rkpa80259, Mineralogy, Modal Analysis, Abundance, Kamacite, Troilite, Niningerite
Scientific paper
The compositionally distinct EH and EL groups together with four (3-6) petrologic types which constitute the enstatite chondrites represent increasing degrees of metamorphic alteration. Although bulk composition variations preclude a simple conversion of EH4 into EL6 material, complex models which involve simultaneous bulk composition and petrologic type variations may be implied by other classification schemes in common use. Attention is presently given to the discovery of the first EL5 chondrite, which breaks the EH3,4-EH5-EL6 sequence and indicates that the enstatite chondrites constitute the two discrete, isochemical metamorphic sequences EH3-5 and EL5-6.
Rubin Alan E.
Sears Derek W. G.
Weeks Karen S.
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