%0 Journal Article %T In situ micro-Raman and X-ray diffraction study of diamonds and petrology of the new ureilite UAE 001 from the United Arab Emirates %+ Institut für Geologie und Mineralogie [Köln] %+ Department of Mineralogy %+ Bavarian Research Institute of Experimental Geochemistry and Geophysics (Bayerisches Geoinstitut) %+ Institut für Geowissenschaften [Mainz] %+ Institut für Mineralogie und Kristallographie %+ European Synchrotron Radiation Facility (ESRF) %+ Laboratoire de Géophysique Interne et Tectonophysique (LGIT) %A Hezel, Dominik C. %A Dubrovinsky, Leonid %A Nasdala, Lutz %A Cauzid, Jean %A Simionovici, Alexandre %A Gelissen, Marko %A Schonbeck, Thorbjorn %< avec comité de lecture %@ 1086-9379 %J Meteoritics and Planetary Science %I Wiley %V 43 %N 7 %P 1127 à 1136 %8 2008 %D 2008 %K ureilite %K diamond %K micro-Raman %K in-situ XRD %Z Sciences of the Universe [physics]/Earth Sciences/MineralogyJournal articles %X A new olivine-pigeonite ureilite containing abundant diamonds and graphite was found in the United Arab Emirates. This is the first report of a meteorite in this country. The sample is heavily altered, of medium shock level, and has a total weight of 155 g. Bulk rock, olivine (Fo79.8-81.8) and pyroxene (En73.9-75.2, Fs15.5-16.9, Wo8.8-9.5) compositions are typical of ureilites. Olivine rims are reduced with Fo increasing up to Fo96.1-96.8. Metal in these rims is completely altered to Fehydroxide during terrestrial weathering. We studied diamond and graphite using micro-Raman and in situ synchrotron X-ray diffraction. The main diamond Raman band (LO=TO mode at ~1332 cm−1) is broadened when compared to well-ordered diamond single crystals. Full widths at half maximum (FWHM) values scatter around 7 cm−1. These values resemble FWHM values obtained from chemical vapor deposition (CVD) diamond. In situ XRD measurements show that diamonds have large grain sizes, up to >5 μm. Some of the graphite measured is compressed graphite. We explore the possibilities of CVD versus impact shock origin of diamonds and conclude that a shock origin is much more plausible. The broadening of the Raman bands might be explained by prolonged shock pressure resulting in a transitional Raman signal between experimentally shock-produced and natural diamonds. %G English %L insu-00371979 %U https://insu.hal.science/insu-00371979 %~ INSU %~ UNIV-SAVOIE %~ UGA %~ CNRS %~ UNIV-GRENOBLE1 %~ INPG %~ IRSTEA %~ GIP-BE %~ IFSTTAR %~ AGREENIUM %~ INRAE %~ USMB-COMUE %~ UNIV-EIFFEL %~ IFSTTAR-UNIVEIFFEL