A NEW NONDESTRUCTIVE X-RAY METHOD FOR THE DETERMINATION OF THE 3D MINERALOGY AT THE MICROMETER SCALE
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dc.contributor.author | Lemelle L. | |
dc.contributor.author | Simionovici A. | |
dc.contributor.author | Gillet P. | |
dc.contributor.author | Rau C. | |
dc.contributor.author | Chukalina M. | |
dc.contributor.author | Truche R. | |
dc.date.accessioned | 2022-03-30T02:31:57Z | |
dc.date.available | 2022-03-30T02:31:57Z | |
dc.date.issued | 2004 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=13472555 | |
dc.identifier.citation | American Mineralogist, 2004, 89, 4, 547-553 | |
dc.identifier.issn | 0003-004X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/36771 | |
dc.description.abstract | The combination of synchrotron-based X-ray absorption and fluorescence computed tomographies (CT) is a new method allowing a noninvasive and nondestructive determination of the three-dimensional (3D) mineralogy with micrometer resolution of sub-millimeter silicate grains, possibly stored in a silica holder. These CT were performed with beams of a few tens of keV from a third-generation synchrotron source on one olivine grain of the NWA817 Martian meteorite presenting a reddish alteration phase. The reconstructed sections show a network of fractures and a few micrometer-thick layers formed on one grain. The 3D facet orientation and the X-ray attenuation coefficient indicate that this grain is an Fo44±9 olivine crystal. The fluorescence section reveals rims enriched in Fe (a major element) or depleted in Ca (a minor element). This CT combination shows that the micrometer-thick layer is preferentially formed on the (010) olivine face and has a lower density (3.5 ± 0.4 g/cm3 ) than the olivine, even though it is enriched in Fe. Its complex nano-petrography and the distributions of nanometer-sized voids and fractures in such a micrometer thick layer, first observed by scanning electron microscopy on focused ion-beam cuts, is not shown by CT. The precision presently achieved, although moderate, is sufficient to obtain a 3D semi-quantitative view of the mineralogy consistent with the one previously established by electron probe microanalyses (Sautter et al. 2002). | |
dc.title | A NEW NONDESTRUCTIVE X-RAY METHOD FOR THE DETERMINATION OF THE 3D MINERALOGY AT THE MICROMETER SCALE | |
dc.type | Статья |
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