Bulk density of ordinary chondrite meteorites and implications for asteroidal internal structure

Details Bulk density of ordinary chondrite meteorites and implications for asteroidal internal structure Bulk density of ordinary chondrite meteorites and implications for asteroidal internal structure

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000m%26ps...35.1203w&link_type=abstract

Meteoritics & Planetary Science, vol. 35, no. 6, pp. 1203-1213 (2000).

Computer Science

30

Scientific paper

The bulk densities of 82 samples of 72 ordinary chondrites (OCs) were measured to an accuracy of ~1% using a modified Archimedian method. We found the average bulk density to be 3.44 +/ 0.19 g/cm3 for the H group, 3.40 +/- 0.15 g/cm3 for the L group, and 3.29 +/- 0.17 g/cm3 for the LL group (+/- represent one sigma). Bulk density measurements of eleven pieces of one fall, Pultusk (H group), were also found to vary considerably (3.31 to 3.63 g/cm3). To investigate controls on bulk density within the OCs, we compared density with bulk chemical composition (the ratio of iron metal to total iron, the ratio of total iron to SiO2, the ratio of FeO to total iron, and MgO). Within each OC group, bulk chemical composition is nearly invariant while bulk density varies from ~3.0 to 3.8 g/cm3. Slight but systematic differences in average density between the H, L, LL groups presumably relate to differences in metallic iron abundance. However, considerable overlap between OC groups and the wide range of bulk densities within each group suggest differences in porosity dominantly control variations of density within the OC subgroups.

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