EXHUMATION OF THE HELLENIC ACCRETIONARY PRISM – EVIDENCE FROM FISSION-TRACK THERMOCHRONOLOGY

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Published: Jan 1, 2010
DOI: https://doi.org/10.12681/bgsg.11183
Keywords:
Tripolis and Pindos units flysch accretionary prism fission-track thermochronology Potamos detachment fault Hellenic forearc
A.E Marsellos
Dept. of Geology, Union College
W.S.F Kidd
Dept. of Geology, Union College
J.I. Garver
Dept. of Earth & Atmos. Sciences, State University of New York
K.G. Kyriakopoulos
Dept. of Geology & Geoenvironment,National & Kapodistrian University of Athens
Abstract
Below the Potamos extensional detachment fault exposed in northern Kythera, the phyllite-quartzite unit (PQU) shows very consistent zircon FT cooling ages of c.11 Ma reflecting the time just after the rapid exhumation through the brittle-ductile transition. In contrast, a wide range of Mesozoic and some Paleozoic zircon FT cooling ages from Eocene-Oligocene Tripolis and Pindos flysch sandstones from above the detachment reflect sedimentary source ages. Early Miocene apatite fissiontrack cooling ages characterize the flysch sandstones, and show that early Miocene exhumation affected rocks above the detachment. The thermotectonic evolution of the flysch of Tripolis and Pindos units within the rocks above the Potamos detachment on Kythera is reconstructed using zircon and apatite fission-track (FT) thermochronology. The apatite FT data provide evidence for a burial depth of at least 6km for the samples, which were reset. Burial was not deeper than 11km, since the zircon fission-track system in the same rocks was not reset. The exposed rocks of Tripolis and Pindos flysch on Kythera represent part of an accretionary wedge with a burial shortly after deposition in or near the subduction trench, and a cooling history due to exhumation of the flysch in the early Miocene. The subsequent Mid-Late Miocene exhumation of the PQU unit follows from beneath the (mostly carbonate) Tripolis and Pindos sedimentary rocks.
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  • General and Structural Geology
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References
Bernet, M. and Garver, J.I., 2005. Fission-track Analysis of Detrital Zircon. Reviews in Mineralogy &
Geochemistry 58, 205-238.
Brandon, M.T., Vance, J.A., 1992. Fission-track ages of detrital zircon grains: implications for the tectonic
evolution of the Cenozoic Olympic subduction complex. American Journal of Science 292, 565–636.
Brandon, M.T., 1996. Probability density plot for fission-track grain-age samples. Radiation Measurements
, 663–676.
Brix, M.R., Stockhert, B., Seidel, E., Theye, T., Thomson, S.N., Kuster, M., 2002. Thermobarometric
data from a fossil zircon partial annealing zone in high pressure-low temperature rocks of eastern and
central Crete, Greece. Tectonophysics 349, 309-326.
Christodoulou, G., 1966. Some remarks on the Geology of Kythira island and a micropaleontological
analysis of its Neogene Formations. Bull. Geol. Soc. Greece 6, 385-399.
Danamos, 1992. Contribution to geology and hydrogeology of Kythera Island. Ph.D. dissertation, Athens, 330.
Doutsos, T., Piper, G., Boronkay, K., Koukouvelas, I., 1993. Kinematics of the central Hellenides. Tectonics
, 936-953.
Fassoulas, C., Kilias, A., Mountrakis, D., 1994. Postnappe stacking extension and exhumation of highpressure/low-temperature
rocks in the island of Crete, Greece, Tectonics 13, 127-138.
Fleury, J.J., 1980. Les zones de Gavrovo-Tripolitza et du Pinde-Olonos (Grece continentale et Peloponedr
du Nord): Evolution d’une plateforme et d’ un bassin dans leur cadre alpin: Public. de la Soc. Geol.
du Nord, Lille Publication 4, 651.
Galbraith, R.F., 1981. On statistical models for fission track counts. Mathematical Geology 13, 471-488.
Gerolymatos, I. K., 1994. Metamorphose und Tectonik der Phyllit-Quartzit-Serie und der Tyros-Schichten
auf dem Peloponnes und Kythira. Berliner Geowissenschaftliche Abhandlungen, Geologie Palaontologie
, 1-101.
XLIII, No 1 – 317
Gleadow, A.J.W., 1981. Fission track dating: what are the real alternatives. Nuclear Tracks 5, 3-14.
Green, P.F., 1981. A new look at statistics in fission-track dating. Nuclear Tracks 5, 77-86.
Hurford, A.J., Green, P.F., 1983. The zeta age calibration of fission-track dating. Isotope Geoscience 1,
-317.
Hurford, A.J., 1990. Standardization of fission track dating calibration: recommendation by the Fission
Track Working Group of the I.U.G.S. Subcommission on Geochronology. Chemical Geology (Isotope
Geoscience Section) 80, 171-178.
Jolivet, L., Goffe, B., Monie, P., Truffert-Luxey C., Patriat, M., Bonneau, M., 1996. Miocene detachment
in Crete and exhumation P-T-t paths of high pressure metamorphic rocks. Tectonics 15, 1129-1153.
Krahl, J., Kauffmann, G., Kozur, H., Richter, D., Forster, O., Heinritzi, F., 1983. Neue Daten zur Biostratigraphie
and zur tectonischen Lagerun der Phyllit-Gruppe und der Trypali-Gruppe auf der Insel
Kreta (Griechenland). Geologische Rundschau 72, 1147-1166.
Lekkas, Sp., 1986. Les unites structurales dans l’ile de Cythere. Bul. Geol. Soc. Greece XX, 159-173.
Marsellos, A.E., 2006. Mapping of the Detachment fault in Kythera Island and study of the related structural
shear sense indicators. Unpublished MS Thesis, State University of New York Albany, 201.
Marsellos, A.E., Kidd, W.S.F., 2006. Detachment fault and shear zone of the Cretan-Peloponnese ridge
in Kythera Island. Geological Society of America, Abstracts with Programs 38:7, 238.
Marsellos, A.E., Kidd., W.S.F., 2008. Extension and exhumation of the Hellenic forearc ridge in Kythera.
The Journal of Geology 116, 640-651.
Marsellos, A.E., 2008. Extension and Exhumation of the Hellenic forearc; and Radiation Damage in Zircon.
Unpublished Ph.D. thesis, State University of New York Albany, 754.
Marsellos, A.E., Kidd, W.S.F., Garver, J.I., 2010. Extension and exhumation of the HP/LT rocks in the Hellenic
forearc ridge. American Journal of Science, 310, 1-36.
Mountrakis, D., 1986. The Pelagonian zone in Greece: a polyphase-deformed fragment of the Cimmerian
continent and its role in the geotectonic evolution of the eastern Mediterranean. J.Geol. 94, 335-347.
Pe-Piper, G., 1982. Geochemistry, tectonic setting and metamorphism of mid-Triassic volcanic rocks of
Greece. Tectonophysics 85, 253-272.
Petrocheilos, J., 1966. Geological map of Kythera Island, scale 1:50,000. Institute for Geology and Subsurface
Research, Athens.
Platt, J.P., 1987. The uplift of high-pressure-low-temperature metamorphic rocks. Phil. Trans.R.Soc.Lond.,
A321, 87-103.
Robertson, A.H.F., Clift, P.D., Degnan, P., Jones, G., 1991. Paleoceanography of the Eastern Mediterranean
Neotethys. Palaeogeography, Palaeoclimatology, Palaeoecology 87, 289-343.
Rahl, J.M., Anderson, K.M., Brandon, M.T., Fassoulas, C., 2005. Raman spectroscopic carbonaceous
material thermometry of low-grade metamorphic rocks: Calibration and application to tectonic exhumation
in Crete, Greece. Earth and Planetary Science Letters 240, 339-354.
Ring, U., Brachert, T., Fassoulas, C., 2001. Middle Miocene graben development in Crete and its possible
relation to large-scale detachment faults in the southern Aegean. Terra Nova 13, 297-304.
Robertson, A.H.F. and Dixon, J.E., 1984. Introduction: aspects of the geological evolution of the eastern
Mediterranean. In Dixon, J.E., and Robertson, A.H.F., eds. The geological evolution of the eastern
Mediterranean. Geol. Soc. Lond. Spec.Publ. 17, 1-74.
Romano, S.S., Dorr, W., Zulauf, G., 2004. Cambrian granitoids in pre-Alpine basement of Crete (Greece):
evidence from U-Pb dating of zircon. Int J Earth Sci (Geol Rundsch) 93, 844-859.
Seidel, E., Kreuzer, H. and Harre, W., 1982. A Late Oligocene/Early Miocene high-pressure belt in the
XLIII, No 1 – 318
extternal Hellenides. Geol. Jahrb. E23, 165-206.
Theodoropoulos, D.K., 1973. Physical Geography of the island of Kythira, Athens, 94.
Thiebault, F., 1982. Evolution geodynamique des Hellenides externes en Peloponnese meridional (Grece).
Soc. Geol. du Nord, Publication n.6, 574.
Thomson, S.N., Stockhert, B., Brix, M.R., 1999. Miocene high-pressure metamorphic rocks of Crete:
rapid exhumation by buoyant escape. in Ring, U., Brandon, M., Lister, G.S., Willet, S. editors, Exhumation
Processes: Normal Faulting, Ductile Flow and Erosion. Journal of Geological Society of
London, Special Publication 154, 87-107.
Xypolias, P., Koukouvelas, I., 2001. Kinematic vorticity and strain rate patterns associated with ductile
extrusion in the Chelmos Shear zone (External Hellenides, Greece). Tectonophysics 338, 59-77.
Xypolias, P., Kokkalas, S., 2001. Strain-dependent field and plate motions in the south.
Xypolias, P., Koukouvelas, I, Zulauf, G., 2008. Cenozoic tectonic evolution of northeastern Apulia: insights
from a key study area in the Hellenides (Kythira, Greece). Z.dt. Ges. Geowiss., 159/3, 439-455.
Xypolias, P., Dorr, W., Zulauf, G., 2006. Late Carboniferous plutonism within the pre-Alpine basement
of the External Hellenides (Kithira, Greece): evidence from U-Pb zircon dating. J. Geol. Soc. Lond.,
, 539-547.
Zulauf, G., Romano, S.S., Dorr, W., Fiala, J., 2007. Crete and the Minoan terranes: Age constaints from
U-Pb dating of detrital zircons. Geol. Soc. Am., Special Paper 423, 401-411.