Paleomagnetism and magnetic fabrics of the Almopias, Thessaly and Milos volcanics. Implications for the regional deformation


A. ATZEMOGLOU
D. KONDOPOULOU
I. ZANANIRI
Résumé

New palaeomagnetic and rock magnetic data obtained from the plio-quaternary volcanics in Almopias (NW Greece) are presented, together with existing ones from two other localities (Thessaly and Milos) in the Aegean extensional area. In most cases a stable component, slightly deviated from the expected direction, has been identified. Rock magnetic analysis reveals the presence of either magnetite (Thessaly), hematite (Milos) or both (Almopias) The anisotropy of magnetic susceptibility reaches significant levels for only part of the samples whereas the anisotropy ellipsoid could be defined in only one case (Almopias). The existing structural data for the three areas, together with fault plane solutions provide a representative deformation pattern. Comparison of -small- rotation angles and possible rotation of the stress field has been possible in the case of Almopias.

Article Details
  • Rubrique
  • General and Structural Geology
Téléchargements
Les données relatives au téléchargement ne sont pas encore disponibles.
Biographie de l'auteur
D. KONDOPOULOU, Aristotle University of Thessaloniki
Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης
Références
BALDI, P., BUONASORTE, G., MATTEL M., FUNICIELLO, R. & KISSEL, C, 1995. Paleomagnetic evidence of non rotational tectonism in the Tuscan-Latium geothermal province (Italy). Proceedings of the World Geothermal Congress, Florence, Italy, 939-943. Intern. Geoth. Ass., Stanford, USA.
BOBIER, C, 1968. Etude paleomagnetique de quelques formations du complexe volcanique d' Almopias C.R.A.S. (267), 1091-1094.
CAPUTO, R., 1996. The active Nea Anchialos Fault System (Central Greece) : comparison of geological, morphotectonic, archaeological and seismological data. Ann. Geofis., 39, 557-574.
DUERMEIJER, CE., NYST, M., MEIJER, P.TH., LANGEREIS, CG., SPAKMAN, W., 2000. Neogene evolution of the Aegean arc : paleomagnetic and geodetic evidence for a rapid and young rotation phase. Earth and Planet. Sci. Let., 176, 509-525.
FYTIKAS, M., INNOCENTI, F., KOLIOS, Ν., MANETTI, P., MAZZUOLI, R., POLI, G., RITA, F., VILLARI, L., 1986. Volcanology and Petrology of volcanic products from the Island of Milos and neighbouring islets. J. Volcan. Geoth. Res. 28, 297-317.
GALANAKIS, D., PAVLIDES, S., MOUNDRAKIS, D. 1998. Recent brittle tectonic in Almyros-Pagasitikos, Maliakos, N. Euboea & Pilio. Bulletin of the Geological Society of Greece, vol.XXXII/1, 263-273.
INNOCENTI, F., MANETTI, P., PECCERILLO, Α., POLI, G., 1979. Inner arc volcanism in NW Aegean arc: geochemical and geochronological data. N. Jb. Miner. Mh., 4, 145-158.
JELINEK, V, 1981. Characterization of the magnetic fabric of rocks. Tectonophysics 79, T63-T67.
KISSEL, C, LAJ, C, MAZAUD, Α., 1986. Paleomagnetic results from Neogene formations in Evia, Skyros and the Volos region and the deformation of Central Aegea. Geophys. Res. Lett., 13: 1446-1449.
KOLIOS, N., INNOCENTI, F., MANETTI, P., PECCERILLO, Α., GUILIANI, O., 1980. The Pliocene volcanism of the Voras Mts (Central Macedonia, Greece). Bull. Volcanol., Vol.43-3, 553-568.
KONDOPOULOU, D., LAUER, J.P., 1984. Paleomagnetic data from tertiary units of the North Aegean zone. In J.E.Dixon and A.H.F. Robertson (Editors). The geological evolution of the Eastern Mediterranean. Spec. Pubi. Geol. Soc, London, 17, 681-686.
KONDOPOULOU, D., PAVLIDES, S., 1990. Paleomagnetic and neotectonic evidence for different deformation patterns in the South Aegean volcanic arc: the case of Milos island. Proceedings of IESCA, Izmir, 210-223.
KONDOPOULOU, D., CAPUTO, R., 1997. Palaeomagnetic evidence for non-rotational deformation along the Nea Anchialos Fault System, Central Greece. Annali di Geofisica, Vol.XL, N.4.
LOUVARI, E., 2000. A detailed seismotectonic study of the Aegean and surrounding regions, based on focal mechanisms of small earthquakes. PhD Thesis, Univ. of Thessaloniki, 373 p.
MOUNDRAKIS, D., KILIAS, Α., PAVLIDES, S., ZOUROS, N., SPYROPOULOS, N., TRANOS, M. AND SOULAKELLIS, N, 1993. Field study of the southern Thessaly highly active fault zone. 2nd Congress Hellenic Geolophysical Union, Fiorina, 5-7 May 1993, Macedonia, Greece, 603-615.
PAVLIDES, S., 1998. Dating the neotectonisms in South Almopias (Central Macedonia, N.Greece). Bulletin of the Geological Society of Greece, vol.XXXII/1, 189-197.
VOUGIOUKALAKIS, G. 1994. The Pliocene volcanics of mountain Voras, Central Macedonia, Greece. Bulletin of the Geological Society of Greece, vol. XXX/1, 223-240 (In Greek, abstract in English).
ZANANIRI, I., 2001. The method of anisotropy of magnetic susceptibility: theory and applications. A case study from the Rhodope Massif. 9th Congress of the Hellenic Geological Society (accepted for publication).
Articles les plus lus par le même auteur ou la même autrice