| Popis: |
The occurrence of amethyst and/or agate bearing geodes in the volcanic rocks of the Serra Geral Formation has been recently studied in more details. The Santana do Livramento region (southwestern Rio Grande do Sul, Brazil) shows small occurrences of this type of ore deposit. Such occurrences are hosted by basalts or by colluviums, and are, however, poorly studied. The geology of this region is made up by volcanic rocks of the Serra Geral Formation, and by sedimentary rocks of the Botucatu Formation. The present study shows the results of a local geophysical survey and a geophysical model for such an ore deposit. |
