Local atomic structure of Fontainebleau sandstone: Evidence for an amorphous phase?

Details Local atomic structure of Fontainebleau sandstone: Evidence for an amorphous phase? Local atomic structure of Fontainebleau sandstone: Evidence for an amorphous phase?

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3124606p&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 24, CiteID L24606

Physics

3

Mineral Physics: X Ray, Neutron, And Electron Spectroscopy And Diffraction, Physical Properties Of Rocks: Microstructure, Physical Properties Of Rocks: General Or Miscellaneous

Scientific paper

Rocks are traditionally viewed as crystallite aggregates; in general the treatment of the composition and mechanical properties never includes solid non-crystalline components. Such glass-like materials are difficult to detect in small quantities by standard techniques (e.g., thin-section polarimetry, x-ray diffraction) but if they exist at critical locations (i.e. grain contacts) they could affect the behavior of rocks considerably. Neutron scattering measurements on a solid sample of Fontainebleau sandstone have shown clear evidence for the presence of an unexpected glass-like component. Atomic pair distribution function (PDF) analysis shows significant local structural deviations from pure quartz. These deviations appear as an excess of 5-10% of nearest neighbor (NN) Si-O and O-O bonds, which is consistent with a 5-10% volume fraction of vitreous silica. These measurements may provide significant information about the still-unexplained causes for the peculiar mechanics and dynamics of sedimentary rocks.

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