Mathematics – Logic
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994metic..29r.523r&link_type=abstract
Meteoritics (ISSN 0026-1114), vol. 29, no. 4, p. 523-524
Mathematics
Logic
1
Breccia, Chondrites, Meteoritic Composition, Solar Corona, Chemical Composition, Chondrule, Mineralogy, Petrology
Scientific paper
Since one major goal of meteorite research is to learn about processes and conditions in the solar nebula it is crucial to identify chondrites that have preserved the early records most perfectly. Brecciation is one of the processes that alters these records and can easily be overlooked. Due to the presence of chemically aberrant grains Scott and Scott et al. conclude that unbrecciated ordinary chondrites generally seem to be the exception, not the rule. In order to find out other than chemical parameters to characterize the brecciation state of a given meteorite we mapped and analyzed the greater than 250-microns grain size fraction of 8 apparentaly unbrecciated H3 chondrites (Tieschitz, Acfer 23, 28, 171, 178, 192, 210, 211). We tried to find out differences in the volume percentage and mean grain size of this fraction, where 'grains' mean chondrules, chondrule fragments, and mineral fragments. For comparison, we applied the same procedure to the brecciated H chondrite Bremervorde and the regolith breccias Acfer 111 and 153. The correlation indicates that the investigated meteorites may be related to each other in a way that Tieschitz-type starting material (of slightly higher petrologic type) was more or less brecciated and comminuted during parent body evolution, leading to finer-grained fragmental and regolith breccias. Tieschitz seems to represent the mechanically less altered H3 chondrite investigated in our study because of its largest mean grain size, its highest amount of grains greater than 250 microns, and the ubiquitous presence of (accretionary) dark rims around chondrules.
Metzler Knut
Romstedt Jens
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