Title
Incompletely Compacted Equilibrated Ordinary Chondrites
Abstract
We document the size distributions and locations of voids present within five highly porous equilibrated ordinary chondrites using high-resolution synchrotron X-ray microtomography (μCT) and helium pycnometry. We found total porosities ranging from ̃10 to 20% within these chondrites, and with μCT we show that up to 64% of the void space is located within intergranular voids within the rock. Given the low (S1-S2) shock stages of the samples and the large voids between mineral grains, we conclude that these samples experienced unusually low amounts of compaction and shock loading throughout their entire post accretionary history. With Fe metal and FeS metal abundances and grain size distributions, we show that these chondrites formed naturally with greater than average porosities prior to parent body metamorphism. These materials were not "fluffed" on their parent body by impact-related regolith gardening or events caused by seismic vibrations. Samples of all three chemical types of ordinary chondrites (LL, L, H) are represented in this study and we conclude that incomplete compaction is common within the asteroid belt.
Publication Date
11-1-2009
Publication Title
Meteoritics and Planetary Science
Volume
44
Issue
11
Number of Pages
1743-1753
Document Type
Article
Personal Identifier
scopus
DOI Link
https://doi.org/10.1111/j.1945-5100.2009.tb01204.x
Copyright Status
Unknown
Socpus ID
76749136785 (Scopus)
Source API URL
https://api.elsevier.com/content/abstract/scopus_id/76749136785
STARS Citation
Sasso, Matthew R.; Macke, Robert J.; Boesenberg, Joseph S.; Britt, Daniel T.; and Rivers, Mark L., "Incompletely Compacted Equilibrated Ordinary Chondrites" (2009). Scopus Export 2000s. 11149.
https://stars.library.ucf.edu/scopus2000/11149