Eight L-group chondrites - A comparative study

The bulk chemical compositions of eight L-group chondrites, Atarra, Cranganore, Karkh, Kuttippuram, Mabwe-Khoywa, Mirzapur, Segowlie, and Sultanpur, have been determined by classical wet chemical analysis. In addition, the compositions and abundances of individual mineral phases were determined with electron-probe techniques. Seven of the eight stones represent the petrographic types 4, 5, and 6. The practically identical bulk and phase compositions imply a similar parent; thus any metamorphic recrystallization must have occurred before the various fragments accreted. Therefore, we interpret these L-group chondrites, in addition to four of the H-group previously reported, as products of multiple impacts of various intensities on similar materials if not on the same parent body.