| More

PETRIFIED WOOD OCCURRENCES IN WESTERN THRACE AND LIMNOS ISLAND: MINERALOGY, GEOCHEMISTRY AND DEPOSITIONAL ENVIRONMENT

Views: 384 Downloads: 210
P. Voudouris, D. Velitzelos, E. Velitzelos, U. Thewald
P. Voudouris, D. Velitzelos, E. Velitzelos, U. Thewald

Abstract


The present study describes the geology and mineralogy of the main petrified wood occurrences in Evros-Rhodopi and Limnos and integrates them in a volcanichydro thermal framework taking into consideration the nature of hydrothermal solutions during the silicification process. In the Lykofi-Fylakto-Lefkymi area, quartz and opal-CT are the main silica polymorph within the wood. The hostrocL· exhibit a zeolitic alteration suggesting reduced and slightly alkaline fluids for the silicification of wood. At Kassiteres/Sappes area the presence ofsilicified wood within kaolinite± alunite altered tuffbreccias indicates that slight acidic fluids were involved in the silicification processes. In Limnos Island the fossiliferous Portianou, Varos- Roussopouli and Moudros-Roussopouli areas occur in the periphery of an eroded volcanic edifice exposed at Fakos peninsula. The silicified wood occurs: (a) within weakly altered pyroclastics and (b) associated to several horizons of sinters interbedded within the pyroclastics. Transformation of amorphous silica to opal-CT and then to quartz is postulated based on XRD and SEM studies. The studied areas represent unique natural monuments, comparable to the petrified forest of Lesvos island.


Keywords


silicified wood; Evros; Limnos; mineralogy; depositional environment

Full Text:

PDF

References


Christofides, G., Soldâtes, T., Eleftheriadis, G., and Koroneos, Α., 1998. Chemical and isotopie evidence for source contamination and crustal assimilation in the Hellenic Rhodope plutonic rocks, Acta Vulcanologica, 10, 305-318.

Davis, E., 1960. The volcanic rocks of Lemnos island, Ann Geol Pays Hellen, 11, 1-82.

De Boorder, H., Spakman, W., White, SH., and Wortel, MJR., 1998. Late Cenozoic mineralization, orogenic collapse and slab detachment in the European Alpine Belt, Earth Plan Sc Lett, 164, 569-575.

Del Moro, Α., Innocenti, F., Kyriakopoulos, C, Manetti, P., and Papadopoulos, P., 1988. Tertiary granitoids from Thrace (Northern Greece): Sr isotopie and petro- chemical data, Ν Jb Miner Abh, 159,113-135.

Fytikas, M., Giuliani, O., Innocenti, F., Manned, P., Mazzuoli, R., Peccerillo, Α., and Villari, L., 1979. Neogene volcanism of the Northern and Central Aegean region, Ann Geol Pays Hell, 30, 106-129.

Fytikas, M., Innocenti, F., Manneti, P., Mazzuoli, R., Peccerillo, Α., and Villari, L., 1984. Tertiary to Quaternary evolution of volcanism in the Aegean region, In J.E. Dixon and A.H.F. Robertson (eds), 77*e geological evolution of the eastern Mediterranean, Geol. Soc. Spec. Pubi., Oxford, 17, 687-699pp.

Henley, R.W., and Ellis, J., 1983. Geothermal systems ancient and modern: A geochemical review, Earth Sci Rev, 19, 1-50.

Innocenti, F., Kolios, Ν., Manetti, Ο., Mazzuoli, R., Peccerillo, G., Rita, F., and Villari, L., 1984. Evolution and geodynamic significance of the Tertiary orogenic volcanism in northeastern Greece, Bull Volcanol, 47, 25-37.

Innocenti, F., Manetti, Ο., Mazzuoli, R., Pertusati, P., Fytikas, M., and Kolios, N., 1994, The geology and geodynamic significance of the island of Limnos, North Aegean Sea, Greece, Ν Jb Geol Palaont Mh, 11, 661 -691.

Kopp, CO., 1965. Geologie Thraziens III. Das Tertiär zwischen Rhodope und Evros, Ann Geol. Pays Hell, 16,315-362.

Krohe, Α., and Mposkos, E., 2001. Structural evolution and exhumation history of the Rhodope UHP-HP metamorphic province (Northern Greece), Bull Geol Soc Greece, 34, 75-82.

Kyriakopoulos, K., 1987. A geochronological, geochemical and mineralogical study of tertiary plutonic rocks of the Rhodope massif and their isotopie characteristics. Unpubl. Ph.D. thesis, Univ. Athens, 343pp. (in greek)

Melfos, V., Vavelidis, M., Christofides, G., and Seidel, E., 2002. Origin and evolution of the Tertiary Maronia porphyry copper-molybdenum deposit, Thrace, Greece. Mineral Deposita, 37, 648-668.

Papadopoulos, P., 1982. Geological map of Greece, Maronia sheet, 1:50.000, IGME, Athens.

Papp, Α., 1953. Erläuterungen zur Geologie der Insel Lemnos, Ann Geol Pays Hell, 1-33.

Pecskay, Z., Eleftheriadis, G., Koroneos, Α., Soldâtes, T., and Christofides, G., 2003. Κ/Ar dating, geochemistry and evolution of the Tertiary volcanic rocks (Thrace, northeastern Greece). In D. Eliopoulos et al. (eds), Mineral Exploration and Sustainable Development, Millpress Publications, Rotterdam. 1229-1232pp

Pe-Piper, G, Christofides, G., and Eleftheriadis, G., 1998. Lead and neodymium isotopie composition of Tertiary igneous rocks, of northeastern Greece and their regional significance, Acta Vulcanologica, 10,255-263.

Rice, CM., Trewin, N.H., and Anderson L.I., 2002. Geological setting of the early Devonian Rhynie cherts, Aberdeenshire, Scotland: an early terrestrial hot spring system, Journal Geol. Society London 159,203-214.

Roessler, R., 2001. Der Versteinerte Wald von Chemnitz, Museum für Naturkunde Chemnitz, 205pp.

Roussos, N., 1993. Geological map of Greece, Myrina and Moudros sheets, Limnos island, scale 1:50.000,1.G.M.E., Athens.

Skarpelis, N., Economou, M., and Michael, K., 1987. Geology, petrology and polymetallic ore types in Tertiary volcanosedimentary terrain, Virini-Pessani-Dadia area, West Thrace (Northern Greece), Geol. Bale, 17(6), 31-41.

Velitzelos, E., and Zouros, N., 1997. The petrified forest of Lesvos - Protected natural monument, Engineering Geology and the environment, In P. Marinos, Koukis, Tsiambaos and G. Stournaras (eds), Balkema Publications, 3037-3043pp.

Velitzelos, E., Mountrakis, D., Zouros, N., and Soulakelis, N., 2002. Atlas of the Aegean geological monuments, (Ed. Aegean Ministry), 351pp.

Velitzelos, E., Velitzelos, D., Iamandei, S., and Iamandei, E.P., 2006. Tertiary petrified palm trees in Greece, 7th European Paleobotany-Palynology Conference, 6-16 Sept., Prague, 15Op

.

Voudouris, P., 1993. Mineralogical, geochemical and fluid inclusion studies on epithermal vein type gold-silver mineralizations at Kassiteres/Sapes, (NE-Greece), Unpub PhD thesis, Univ Hamburg, 218pp.

Voudouris, P., and Skarpelis, N., 1998. Epithermal gold-silver mineralizations in Perama (Thrace) and Lemnos, Bull Geol Soc Greece, 32(3), 125-135. (in Greek)

White, N.C., and Hedenquist, J.W., 1995. Epithermal gold deposits: Styles, characteristics and exploration, Soc Econ Geol Newsletter, 23, 9-13.


Refbacks

  • There are currently no refbacks.


Copyright (c) 2018 P. Voudouris, D. Velitzelos, E. Velitzelos, U. Thewald

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