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- W1837231199 abstract "The transformation of perovskite into anatase due to a carbonatitic emplacement was investigated using electron microprobe, back-scattered electron images, element-distribution maps, chemical composition profiles and Raman spectroscopy. The mass balance calculations between perovskite and anatase indicate that Ca, Nd, Ce and Na are leached and Ti, Si, Mg, Zr, Nb and Fe are relatively concentrated. The presence of an amorphous “Ti-layer” (> 1 mm) on the surface of the grains was investigated. Raman spectra confirm the existence of an intermediate phase composed by altered perovskite previously to the anatase crystallization. It is not possible to recognize a limit between the unaltered and altered perovskite, due to the heterogeneity of the process. The perovskite structure changes before the leaching of calcium. This process culminated with the crystallization of anatase when the calcium is leached and the structure collapses. The alteration process by the carbonatic fluid action is different from that induced by weathering which promote the leaching of calcium and the anatase genesis in two stages." @default.
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- W1837231199 date "2005-01-01" @default.
- W1837231199 modified "2023-09-24" @default.
- W1837231199 title "ALTERATION OF PEROVSKITE TO ANATASE IN SILICA UNDERSATURATED ROCKS OF THE CATALÃO-I CARBONATITE COMPLEX, BRAZIL: A RAMAN STUDY" @default.
- W1837231199 doi "https://doi.org/10.5327/rbg.v35i2.1164" @default.
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