Petrography and chemistry of SiO2 filling phases in the amethyst geodes from the Serra Geral Formation deposit,Rio Grande do Sul,Brazil |
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Authors: | Adriane Commin-Fischer Gilles Berger Mireille Polvé Michel Dubois Paul Sardini Daniel Beaufort Milton Formoso |
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Affiliation: | 1. Istituto di Astrofisica e Planetologia Spaziali, INAF, Rome, Italy;2. Osservatorio Astronomico di Teramo, INAF, Teramo, Italy;3. International Research School of Planetary Sciences, Dipartimento di Ingegneria e Geologia, Università Gabriele D''Annunzio, Pescara, Italy;1. Programa de Pós-Graduação em Geologia e Geoquímica-PPGG, Instituto de Geociências, Universidade Federal do Pará – UFPA, Rua Augusto Corrêa, s/n, CEP 66075-110 Belém (PA), Brazil;2. Instituto de Geociências, Universidade de São Paulo - USP, São Paulo, SP, Brazil |
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Abstract: | The filling process of amethyst-bearing geodes from Serra Geral Formation basalts, Brazil, is investigated by different methods performed on the SiO2 filling phases. Image analysis of quartz–amethyst deposits suggests a single growing mechanism ruled by geometric selection of randomly oriented crystals. Microthermometry of fluid inclusions reveals formation temperature lower than 100 °C, probably lower than 50 °C, and fluid salinity as high as 3 mass% NaCl eq. Composition in REE and trace-elements measured by ICP-MS on acid-digested or laser-ablated samples indicates a common genesis for amethyst, quartz and chalcedony, as well as the absence of significant variations from one geode to another. 87Sr/86Sr data on chalcedony shows that both the host basalt or the Botucatu sandstone are possible silica sources. These data, combined with thermo-kinetic considerations, permit us to discuss the filling process. We argue in favor of the contribution of a mineralized fluid of hydrothermal origin producing a regional silica source which decreased with time. The observed mineral sequence is related to the depletion of silica in the solution. |
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