Spectroscopic investigation and theoretical modeling of kaolinite-group minerals and other low-temperature phases |
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Authors: | Etienne Balan Emmanuel Fritsch Thierry Allard Guillaume Morin Maxime Guillaumet Simon Delattre Marc Blanchard Georges Calas |
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Institution: | Institut de minéralogie et physique des milieux condensés (IMPMC), université Pierre-et-Marie-Curie, CNRS UMR 7590, IRD UMR 206, université Denis-Diderot, IPGP, 4, place Jussieu, 75252 Paris cedex 05, France |
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Abstract: | This article summarizes some recent results obtained on the physical properties of environmental minerals, mostly kaolinite-group minerals and Fe- and Al-(hydr)oxides occurring in lateritic soils. The defective structure of these minerals, including impurities, stacking faults and radiation-induced defects, is probed using infrared spectroscopy and electron paramagnetic resonance. Resulting information bears on models of soil formation and transformation mechanisms of minerals in low-temperature environments. We underline the increasing impact of quantum chemical modeling in this field, providing straightforward interpretations of spectroscopic signals and overcoming the limits of fingerprint approaches. Importantly, the first-principles modeling of isotopic fractionation factors provides new links between mineralogical and geochemical investigations of secondary minerals. |
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