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Pore size distribution in an uncompacted equilibrated ordinary chondrite |
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| Authors: | Jon M Friedrich Robert J Macke Douglas P Wignarajah Mark L Rivers Daniel T Britt Denton S Ebel |
| Institution: | aDepartment of Chemistry, Fordham University, 441 East Fordham Road, Bronx, NY 10458, USA bDepartment of Earth and Planetary Sciences, American Museum of Natural History, New York, NY 10024, USA cDepartment of Physics, University of Central Florida, Orlando, FL 32816, USA dConsortium for Advanced Radiation Sources, University of Chicago, Argonne, IL 60439, USA |
| Abstract: | The extraordinarily uncompacted nature of the ordinary L chondrite fall Baszkówka gives a unique opportunity to investigate the potentially pre-compaction pore size distribution in an equilibrated ordinary chondrite. Using X-ray microtomography and helium pycnometry on two samples of Baszkówka, we have found that on average, two-thirds of the 19.0% porosity resides in inter- and intra-granular voids with volumes between  3×10?5 and 3 mm3. We show the cumulative number density of pore volumes observable by X-ray microtomography obeys a power law distribution function in this equilibrated ordinary chondrite. We foresee these data adding to our understanding of the impact processing of chondrites and their parent asteroids, where porosity and pore size play significant roles in the parameterization of impact events. |
| Keywords: | X-ray microtomography Porosity Density Ordinary chondrite Asteroid |
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