Lithification opf gas-rich chondrite regolith breccias by grain boundary and localized shock melting

Details Lithification opf gas-rich chondrite regolith breccias by grain boundary and localized shock melting Lithification opf gas-rich chondrite regolith breccias by grain boundary and localized shock melting

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..66....1b&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 66, Dec. 1983, p. 1-10. Research supported by the Deutsche Forschungs

Computer Science

46

Breccia, Chondrites, Consolidation, Grain Boundaries, Impact Melts, Meteoritic Microstructures, Regolith, Feldspars, Helium, Meteoritic Composition, Mineralogy, Neon, Textures

Scientific paper

The fine-grained matrices (less than 150 microns) of 14 gas-rich ordinary chondrile regolith breccias were studied in an attempt to decipher the nature of the lithification process that converted loose regolith material into consolidated breccias. It is found that there is a continuouos gradation in matrix textures from nearly completely clastic (class A) to highly cemented (class C) breccias in which the remining clasts are completely surrounded by interstitial, shock-melted material. It is concluded that this interstitial material is formed by shock melting in the porous regolith. In general, the abundances of solar-wind-implanted He-4 and Ne-20 are inversely correlated with the abundance of intenstitial, shock-melted, feldspathic material. Chondrites with the highest abundance of interstitial, melted material (class C) experienced the highest shock pressures and temperatures and suffered the most extensive degassing. It is this interstitial, feldspathic melt that lithifies and cements the breccias together; those breccias with very little interstitial melt (class A) are the most porous and least consolidated.

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