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dc.contributor.authorBland, Phil
dc.contributor.authorHoward, L.
dc.contributor.authorPrior, D.
dc.contributor.authorWheeler, J.
dc.contributor.authorHough, R.
dc.contributor.authorDyl, Kathryn
dc.identifier.citationBland, P. and Howard, L. and Prior, D. and Wheeler, J. and Hough, R. and Dyl, K. 2011. Earliest rock fabric formed in the Solar System preserved in a chondrule rim. Nature Geoscience. 4 (4): pp. 244-247.

Rock fabrics – the preferred orientation of grains – provide a window into the history of rock formation, deformation and compaction. Chondritic meteorites are among the oldest materials in the Solar System1 and their fabrics should record a range of processes occurring in the nebula and in asteroids, but due to abundant fine-grained material these samples have largely resisted traditional in situ fabric analysis. Here we use high resolution electron backscatter diffraction to map the orientation of sub-micrometre grains in the Allende CV carbonaceous chondrite: the matrix material that is interstitial to the mm-sized spherical chondrules that give chondrites their name, and fine-grained rims which surround those chondrules. Although Allende matrix exhibits a bulk uniaxial fabric relating to a significant compressive event in the parent asteroid, we find that fine-grained rims preserve a spherically symmetric fabric centred on the chondrule. We define a method that quantitatively relates fabric intensity to net compression, and reconstruct an initial porosity for the rims of 70-80% - a value very close to model estimates for the earliest uncompacted aggregates2,3. We conclude that the chondrule rim textures formed in a nebula setting and may therefore be the first rock fabric to have formed in the Solar System.

dc.publisherNature Publishing Group, Macmillan Publishers Ltd
dc.titleEarliest rock fabric formed in the Solar System preserved in a chondrule rim
dc.typeJournal Article
dcterms.source.titleNature Geoscience
curtin.accessStatusOpen access

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