The dispersal of the Gondwana Super-fan System in the eastern Mediterranean: New insights from detrital zircon geochronology |
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| Institution: | 1. Géosciences Rennes, UMR 6118 CNRS, Université Rennes 1, Campus de Beaulieu, 35042 Rennes, France;2. Faculty of Geology and Geoenvironment, National and Kapodistrian University of Athens, Panepistimioupoli, Zographou, Athens 15784, Greece;3. UMR CNRS 6524, Laboratoire Magmas et Volcans, 63038 Clermont-Ferrand Cedex, France;1. V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia;2. Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia;3. Center of Isotopic Research, A.P. Karpinsky Russian Geological Research Institute (VSEGEI), Srednii pr. 74, St. Petersburg, 199106, Russia;4. St. Petersburg State University, Department of Geology, Universitetskaya nab. 7/9, St. Petersburg, 199034, Russia;1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China;2. School of Earth Sciences, China University of Geosciences, Wuhan 430074, China;3. Department of Geology, Hanoi University of Mining and Geology, Hanoi, Viet Nam;4. John de Laeter Centre, Curtin University, Perth, WA 6102, Australia;5. General Department of Geology and Minerals of Viet Nam, Hanoi, Viet Nam;1. CODES ARC Centre of Excellence in Ore Deposits, University of Tasmania, Box 252-79, Hobart, Tasmania 7001, Australia;2. Bureau of Geological Survey, Royal Thai Department of Mineral Resources, Rama VI Road, Bangkok 10400, Thailand;3. Predrill Stresses International Pty Ltd, Level 1, 7 Durong St., Newstead, Queensland 4006, Australia;4. Palaeontological Research and Education Centre, Mahasarakham University, Mahasarakham 44150, Thailand;5. Faculty of Science, Mahasarakham University, Mahasarakham 44150, Thailand;1. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS), Department of Applied Geology, Curtin University, GPO Box U1987, Perth, WA 6845, Australia;3. The Institute for Geoscience Research (TIGeR), Department of Applied Geology, Curtin University, GPO Box U1987, Perth, WA 6845, Australia;4. State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;1. Geological Engineering, Hasanuddin University, Jl. Poros Malino KM.6 Bontomarannu (92171) Gowa, South Sulawesi, Indonesia;2. Graduate School of Technology and Resource Science, Akita University, 28-2, Tegata-Ozawa, Akita 010-8502, Japan;3. Department of Earth and Planetary Systems Science, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima 739-8526, Japan |
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| Abstract: | We report here new LA-ICPMS detrital zircon U–Pb ages of a quartzite from the autochthon of Peloponnesus (Feneos locality), southern Greece. The rock classifies as a mature quartz arenite and belongs to an original shale–sandstone succession now metamorphosed into a phyllite–quartzite unit. Zircon age clusters at 0.52–0.75, 0.85, 0.95–1.1, 1.75–2 and 2.4–3 Ga point at the Saharan Metacraton and the Transgondwanan Supermountain as contributing sources; the youngest concordant grain is 522 Ma old. Our data collectively suggest deposition during the Cambro-Ordovician in a collisional setting and are in excellent agreement with those of the virtually intact Cambro-Ordovician sandstone–shale sequences of Libya (Murzuq and Kufrah basins) and the Middle East (Israel and Jordan), interpreted to have been deposited in the Gondwana Super-fan System which draped the northern Gondwanan periphery from ~ 525 to 460 Ma. By contrast, re-evaluating the available zircon age-distribution pattern and depositional setting of an analogous sequence forming the autochthon of north-central Crete (Galinos beds) we demonstrate that it was originally deposited in a completely different setting, i.e. in an accretionary/fore-arc complex outboard of the south Laurussian active margin (Pelagonia) during the Late Carboniferous. Comparing similar Cambro-Ordovician metasiliciclastic rocks from north-eastern Crete (Sfaka paragneiss), north-central continental Greece (Vertiskos terrane), north-western Turkey (central Sakarya terrane) and the Romanian Carpathians we show that their detrital zircon distribution patterns testify to an original depositional setting similar to that of Peloponnesus (Feneos), Libya and the Middle East. Using key time-frames from previously published palaeogeographic reconstruction models we are able to trace in space and time the Palaeozoic–Early Mesozoic wondering paths of the aforementioned sequences. Thus, time- and facies-equivalent rocks presently cropping out in the eastern Mediterranean share a common provenance from the Gondwana Super-fan System which was diachronously dispersed between Early Silurian and Early Triassic. |
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