Mineralogical and Fluid Inclusions Study of Epithermal Type Veins Intruding the Volcanic Rocks of the Kornofolia Area, Evros, NE Greece.

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Publiée : Dec 2, 2019
DOI : https://doi.org/10.12681/bgsg.20755
Foteini Aravani
Aristotle University of Thessaloniki
https://orcid.org/0000-0003-0309-2513
Lambrini Papadopoulou
Aristotle University of Thessaloniki
Vasileios Melfos
Aristotle University of Thessaloniki
Triantafillos Soldatos
Aristotle University of Thessaloniki
Triantafillia Zorba
Aristotle University of Thessaloniki
Panagiotis Voudouris
Résumé

The volcanic rocks of Kornofolia area, Evros, host a number of epithermal-type veins. The host rocks are Oligocene calc-alkaline andesites to rhyo-dacites. The andesites form hydrothermal breccias and show hydrothermal alteration. The veins comprise mainly silica polymorphs such as quartz, chalcedony and three types of opal (milky white, transparent and green). Amethyst also forms in veins at the same area. Apart from the silica polymorphs, the veins are accompanied by calcite and zeolites. The main aim of this study is the characterization of the silica polymorphs. Using FT-IR analyses, variations in the crystal structure of the three opals were recognized. The green opal is found to be more amorphous than the other two types. Fluid-inclusion measurements were performed in calcite and were compared with amethyst from previous studies. The Th is between 121-175 °C and the Te between -22.9 and -22.4 °C. The salinities range from 0.9 to 4.5 wt % NaCl equiv.

Article Details
  • Rubrique
  • Petrology and Mineralogy
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Bibliographies de l'auteur
Foteini Aravani, Aristotle University of Thessaloniki
Postgraduate Student
Panagiotis Voudouris
National and Kapodistrian University of Athens
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