Mathematics – Logic
Scientific paper
Mar 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..645j&link_type=abstract
Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 645.
Mathematics
Logic
1
Petrology, Regolith, Breccia, Chondrites, Metamorphism (Geology), Scanning Electron Microscopy
Scientific paper
In order to obtain more detailed information about the complex processing and reprocessing of material on the LL-chondritic parent body, we studied different brecciated meteorites. Breccias are characterized by different kinds of mm-sized fragments, like impact melt rock clasts, dark lithic clasts, breccia fragments and metamorphosed clasts of various petrologic types embedded within a fine-grained matrix. Although 62 percent of the LL-chondrites are brecciated, only a few of them are regolith breccias. These breccias represent samples from the parent body surface. They are characterized by the presence of solar cosmic ray tracks and significant concentrations of solar noble gases. In this respect, Acfer 066 is a very interesting sample. A polished thin section of Acfer 066, a LL3-6, S2, W3 chondritic breccia from the Algerian part of the Sahara, was studied by SEM and an electron microprobe. Another thin section of this sample was etched (0.5 h) in WN-solution at standard conditions to reveal nuclear tracks in olivines.
Bischoff Addi
Jäckel Annette
Romstedt Jens
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