DEFORMATION PATTERN IN THE WESTERN NORTH AEGEAN TROUGH: PRELIMINARY RESULTS

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Published: Jul 27, 2016
DOI: https://doi.org/10.12681/bgsg.11708
Keywords:
strike-slip fault horsetail structure transtension transpression North Anatolian Fault
D. Sakellariou
Institute of Oceanography, Hellenic Centre for Marine Research
G. Rousakis
Institute of Oceanography, Hellenic Centre for Marine Research
G. Vougioukalakis
Institute of Geology and Mineral Exploration
Ch. Ioakim
Institute of Geology and Mineral Exploration
I. Panagiotopoulos
Institute of Oceanography, Hellenic Centre for Marine Research
I. Morfis
Institute of Oceanography, Hellenic Centre for Marine Research
E. Zimianitis
Institute of Geology and Mineral Exploration
K. Athanasoulis
Institute of Geology and Mineral Exploration
K. Tsampouraki-Kraounaki
Institute of Oceanography, Hellenic Centre for Marine Research
D. Mpardis
Institute of Oceanography, Hellenic Centre for Marine Research
Abstract

Preliminary interpretation of swath bathymetry data and seismic profiles acquired during four cruises of "YPOTHER/Aegean Explorations" project aboard R/V Aegaeo provides insights into the fault network, fault kinematics and deformation pattern of the western part of the North Aegean Trough (NAT). The N40°E trending western part of the dextral North Anatolian Fault (NAF) runs along the southern margin of the NAT. Numerous high-angle fault splays initiate from and at low angle to NAF. They run firstly in NE-SW direction and then gradually turn to SE-NW forming an imbricate fault pattern, a nicely developed horsetail structure at the western termination of the NAF. The horsetail pattern deforms the NAT's sedimentary infill forming elongate, curved, uplifting or subsiding tectonic blocks arranged along the fault splays. Instead of the expected transtension, the Western NAT's infill displays dextral shearing and transpression associated with a major stress axis in NW-SE direction. The possible explanation for the transpressional deformation of the Western NAT infill may be related with the change of the trend of NAF from N40°E in the western trough to N70°E east of Lemnos Island.

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  • Structural Geology
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References
Armijo, R., Meyer, B., King, G., Rigo, A. and Papanastassiou, D., 1996. Quaternary evolution of the Corinth
rift and its implications for Late Cenozoic evolution of the Aegean, Geophys. J. Int., 126, 11-53.
Billiris, H., Paradissis, D., Veis, G., England, P., Featherstone, W., Parsons, B., Cross, P., Rands, P., Rayson,
M., Sellers, P., Ashkenazi, V., Davison, M., Jackson, J. and Ambraseys, N., 1991. Geodetic
determination of tectonic deformation in central Greece from 1900 to 1988, Nature, 350, 124-129.
Brooks, M. and Ferentinos, G., 1980. Structure and evolution of the Sporades basin of the North
Aegean Trough, Northern Aegean Sea, Tectonophysics, 68, 15-30.
Clarke, P.J., Davies, R.R., England, P.C., Parsons, B., Billiris, H., Paradissis, D., Veis, G., Cross,
P.A., Denys, P.H., Ashkenazi, V., Bingley, R., Kahle, H.G., Muller, M.V. and Briole, P.,
Crustal strain in central Greece from repeated GPS measurements in the interval 1989-
, Geophys. J. Int., 135, 195-214.
Davies, R., England, P., Parsons, B., Billiris, H., Paradissis, D. and Veis, G., 1997. Geodetic strain
of Greece in the interval 1892-1992, J. Geophys. Res., 102, 24,571-24,588.
Dewey, J. and Sengor, A.M.C., 1979. Aegean and surrounding region: Complex multiplate and
continuum tectonics in convergent zone, Geol. Soc. Am. Bull., 90, 84-92.
Hancock, P.L. and Barka, A.A., 1980. Plio-Pleistocene reversal of displacement on the North Anatolian
Fault Zone, Nature, 286(5773)5, 91-594.
Jongsma, D., 1975. A Marine Geophysical Study of the Hellenic Arc, Ph.D, Thesis, Cambridge University.
Laigle, M., Hirn, A., Sachpazi, M. and Roussos, N., 2000. North Aegean crustal deformation: An
active fault imaged to 10 km depth by reflection seismic data, Geology, 28, 71-74.
Lalechos, N. and Savoyat, E., 1979. La sedimentation Neogene dans le Fosse Nord Egeen, 6th
Colloquium on the Geology of the Aegean Region, 2, 591-603.
Le Pichon, X. and Angelier, J., 1979. The Hellenic Arc and trench system: A key to the neotectonic
evolution of the eastern Mediterranean area, Tectonophysics, 60, 1-42.
Le Pichon, X. and Angelier, J., 1981. The Aegean Sea, Philos, Trans. R. Soc. London, Ser. A, 300, 357-372.
Le Pichon, X., Chamot-Rooke, N., Lallemant, S., Noomen, R. and Veis, G., 1995. Geodetic determination
of the kinematics of central Greece with respect to Europe, J. Geophys. Res., 100, 12,675-12,690.
Lyberis, N., 1984. Tectonic evolution of the North Aegean Trough. In: The Geological Evolution of
the Eastern Mediterranean, Spec. Publ. Geol. Soc., 17, 709-725.
McClusky, S., Balassanian, S., Barka, A., Demir, C., Ergintav, S., Georgiev, I., Gurkan, O.,
Hamburger, M., Hurst, K., Kahle, H., Kastens, K., Kekelidze, G., King, R., Kotzev, V., Lenk,
O., Mahmoud, S., Mishin, A., Nadariya, M., Ouzounis, A., Paradissis, D., Peter, Y., Prilepin,
M., Reilinger, R., Sanli, I., Seeger, H., Tealeb, A., Toksöz, M.N. and Veis, G., 2000. Global
Positioning System constraints on plate kinematics and dynamics in the eastern
Mediterranean and Caucasus, J. Geophys. Res., 105, 5695-5719.
McKenzie, D.P., 1972. Active tectonics of the Mediterranean region, Geophys. J. R. Astron. Soc., 30, 109-185.
McKenzie, D.P., 1978. Active tectonics of the Alpine Himalayan Belt, the Aegean Sea and
surrounding regions, Geophys. J. R. Astron. Soc., 55, 217-252.
McKenzie, D.P. and Jackson, J.A., 1983. The relationship between strain rates, crustal thickening,
paleomagnetism, finite strain and fault movements within a deforming zone, Earth Planet.
Sci. Lett., 65, 182-202.
McKenzie, D. and Jackson, J., 1986. A block model of distributed deformation by faulting, J. Geol.
Soc. London, 143, 349-353.
Mascle, J. and Martin, L., 1990. Shallow structure and recent evolution of the Aegean Sea: A
synthesis based on continuous reflection profiles, Marine Geology, 94, 271-299.
Müller, M.D., Geiger, A., Kahle, H.G., Veis, G., Billiris, H., Paradissis, D. and Felekis, S., 2013.
Velocity and deformation fields in the North Aegean domain, Greece, and implications for
fault kinematics, derived from GPS data 1993-2009, Tectonophysics, 597-598, 34-49.
Needham, H.D., Le Pichon, X., Melguen, M., Pautot, G., Renard, V., Avedik, F. and Carre, D., 1973.
North Aegean sea trough: 1972 Jean Charcot cruise, Bull. Geol. Soc. Greece, 10, 152-153.
Nyst, M. and Thatcher, W., 2004. New constraints on the active tectonic deformation of the Aegean,
J. Geoph. Res., 109, B11406, doi: 10.1029/2003JB002830, 2004.
Papanikolaou, D., Alexandri, M., Nomikou, P. and Ballas, D., 2002. Morphotectonic structure of the western
part of the North Aegean Basin based on swath bathymetry, Marine Geology, 190, 465-492.
Papanikolaou, D., Alexandri, M. and Nomikou, P., 2006. Active faulting in the north Aegean basin,
Geol. Soc. America, Sp. Paper 409, 189-209, doi: 10.1130/2006.2409(11).
Sengör, A.M.C., 1979. The North Anatolian transform fault: its age, offset and tectonic significance,
J. Geol. Soc. London, 136, 269-282.
Taymaz, T., Jackson, J.A. and McKenzie, D., 1991. Active tectonics of the north and central Aegean
Sea, Geophys. J. Int., 106, 433-490.
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