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

PDF
Published: Dec 2, 2019
DOI: https://doi.org/10.12681/bgsg.20755
Keywords:
epithermal veins quartz chalcedony opal FT-IR fluid inclusions
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
Abstract

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
  • Section
  • Petrology and Mineralogy
Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

Authors who publish with this journal agree to the following terms:

Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution Non-Commercial License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.

Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g. post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal. Authors are permitted and encouraged to post their work online (preferably in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work.

Downloads
Download data is not yet available.
Author Biographies
Foteini Aravani, Aristotle University of Thessaloniki
Postgraduate Student
Panagiotis Voudouris
National and Kapodistrian University of Athens
References
Adamo, I., Ghisoli, C. & Caucia, F., 2010. A contribution to the study of FTIR spectra of opals. N. Jb. Miner. Abh. 187/1, 63-68
Audétat, A., Günther, D., 1999. Mobility and H2O loss from fluid inclusions in natural quartz crystals. Contrib. Mineral. Petrol., 137, 1–14.
Barr, S.R., Temperley, S., Tarney, J., 1999. Lateral growth of the continental crust through deep level subduction-accretion: a reevaluation of central Greek Rhodope. Lithos, 46, 69–94.
Bodnar, R.J., 2003. Introduction to fluid inclusions. In Fluid Inclusions: Analysis and Interpretation; Samson, I.M., Anderson, A.J., Marshall, D.D., Eds.; SEPM Short Course; Society for Sedimentary Geology: Broken Arrow, OK, USA, Volume 32, 1–8.
Bodnar, R.J., Reynolds, T.J., Kuehn, C.A., 1985. Fluid-Inclusion systematics in epithermal systems. Rev. Econ. Geol. 2, 73–97.
Bonev, N., Marchev, P., Ovtcharova, M., Moritz, R. and Ulianov, A., 2010. U-Pb LA-ICP/MS zircon geochronology of metamorphic basement and Oligocene volcanic rocks from the SE Rhodopes: inferences for the geological history of the Eastern Rhodope crystalline basement. National Conference of the Bulgarian Geological Society, Bulgarian Geological Society, Sofia. 115-116.
Brun, J. P., & Sokoutis, D., 2004. North Aegean extension: from the Rhodope core complex to Neogene basins. In Proceedings of the 5th International Symposium of Eastern Mediterranean Geology, Thessaloniki, Greece Vol. 1, 49-52.
Brun, J. P., & Sokoutis, D., 2007. Kinematics of the southern Rhodope core complex (North Greece). International Journal of Earth Sciences, 96(6), 1079-1099.
Christofides, G., Pecskay, Z., Eleftheriadis, G., Soldatos, T., & Koroneos, A., 2004. The Tertiary Evros volcanic rocks (Thrace, northeastern Greece): Petrology and K/Ar geochronology. Geologica Carpathica-Bratislava, 55(5), 397-410.
Dinter, D.A. & Royden, L., 1993. Late Cenozoic extension in northeastern Greece: Strymon Valley detachment system and Rhodope metamorphic core complex. Geology, 21 (1), 45-48.
Driesner, T., 2007. The system H2O–NaCl. Part II: Correlations for molar volume, enthalpy, and isobaric heat capacity from 0 to 1000 C, 1 to 5000 bar, and 0 to 1 XNaCl. Geochim. Cosmochim. Acta 71, 4902-4919.
Driesner, T., and Heinrich, C.A., 2007. The system H2O-NaCl. I. Correlations for molar volume, enthalpy, and isobaric heat capacity from 0 to 1000 degrees C, 1 to 5000 bar, and 0 to 1 X-NaCl. Geoch. Cosmoch. Acta, 71, 4880–4901.
Farmer, V.C., 1974. The infrared spectra of minerals. Silica, the three-dimentional silicates, borosilicates and beryllium silicates. Mineralogical society monograph 4. Moenke H.H.W, 16, 365-370.
Gaillou, E., Delaunay, A., Rondeau, B., Bouhnik-le-Coz, M., Fritsch, E., Cornen, G., & Monnier, C., 2008. The geochemistry of gem opals as evidence of their origin. Ore Geology Reviews, 34(1-2), 113-126.
Goldstein, R.H., Reynolds, T.J., 1994. Systematics of Fluid Inclusions in Diagenetic Minerals, SEPM Short Course, Society for Sedimentary Geology: Broken Arrow, OK, USA; Vol 31.
Hedenquist, J.W., 1991. Boiling and dilution in the shallow portion of the Waiotapu geothermal system, New Zealand. Geochim. Cosmochim.Acta 55, 2753–2765.
Kilias, A., Falalakis, G., Sfeikos, A., Papadimitriou, E., Vamvaka, A., Gkarlaouni, C., 2013. The Thrace basin in the Rhodope province of NE Greece – A tertiary supradetachment basin and its geodynamic implications. Tectonophysics 595–596, 90–105
Meinhold, G. & Kostopoulos, D.K., 2013. The Circum-Rhodope Belt, northern Greece: Age, provenance, and tectonic setting. Tectonophysics, 595–596, 55–68
Roedder, E., 1984. Fluid inclusions. In Reviews in Mineralogy, Mineralogical Society of America: Chantilly, VA, USA, Vol 12, 644.
Sanders, J. V., 1964. Color of precious opal. Nature, 204(4964), 1151.
Shepherd, T., Rankin, A., Alderton, D., 1985. A Practical Guide to Fluid Inclusion Studies. Blackie and Son, Glasgow, UK.
Sillitoe, R.H., 1985. Ore-Related Breccias in Volcanoplutonic Arcs, Economic Geology 80(6), 1467-1514
Sokoutis, D., Brun, J.P., Van Den Driessche, J. & Pavlides, S., 1993. A major Oligo-Miocene detachment in southern Rhodope controlling north Aegean extension, Journal of the Geological Society, 150, 243-246
Stewart, A.M., Chadderton, L. T. & Senior, B.R., 2010. Self-assembly in the growth of precious opal. Journal of Crystal Growth 312, 391–396
Tarantola, A., Diamond, L.W., Stünitz, H., 2010, Modification of fluid inclusions in quartz by deviatoric stress I: Experimentally induced changes in inclusion shapes and microstructures. Contrib. Mineral. Petrol, 160, 825–843.
Voudouris, P., Melfos, V., Mavrogonatos, C., Tarantola, A., Götze, J., Alfieris, D., Maneta, V., Psimis, I., 2018. Amethyst Occurrences in Tertiary Volcanic Rocks of Greece: Mineralogical, Fluid Inclusion and Oxygen Isotope Constraints on Their Genesis. Minerals, 8, 8, 324, doi:10.3390/min8080324.
Most read articles by the same author(s)