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3
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2642689760
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The Raman data were collected with a DILOR XY micro-Raman spectrometer. A 100X objective was used to focus the beam of an argon laser (λ = 514.5 nm) to give a spot of 2 μm on the sample
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The Raman data were collected with a DILOR XY micro-Raman spectrometer. A 100X objective was used to focus the beam of an argon laser (λ = 514.5 nm) to give a spot of 2 μm on the sample.
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4
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For the FEG-SEM observations and EDS chemical analyses, untreated samples with freshly exposed fractures were mounted on SPI carbon conductive adhesive tape followed by carbon coating with a Baltec modular high-vacuum coating system MED 020. The thickness of the carbon coating is difficult to estimate but is probably <15 nm. Operating conditions of the JEOL JSM6301-F microscope were 5 to 11 kV with a sample-to-objective working distance of 5 to 15 mm
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For the FEG-SEM observations and EDS chemical analyses, untreated samples with freshly exposed fractures were mounted on SPI carbon conductive adhesive tape followed by carbon coating with a Baltec modular high-vacuum coating system MED 020. The thickness of the carbon coating is difficult to estimate but is probably <15 nm. Operating conditions of the JEOL JSM6301-F microscope were 5 to 11 kV with a sample-to-objective working distance of 5 to 15 mm.
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We are grateful to A. Carion and C. Perron (Musée National d'Histoire Naturelle) for generously donating the samples. We thank F. Albarède, P. Buseck, R. L. Folk, D. Rigomier, P. Thomas, P. Warren, and an anonymous reviewer for their constructive comments on the manuscript
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We are grateful to A. Carion and C. Perron (Musée National d'Histoire Naturelle) for generously donating the samples. We thank F. Albarède, P. Buseck, R. L. Folk, D. Rigomier, P. Thomas, P. Warren, and an anonymous reviewer for their constructive comments on the manuscript.
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