Abstract
The pre-Alpine basement of eastern Crete consists of at least three sub complexes which show differences in age and grade of pre-Alpine metamorphism. U-Pb analyses of zircons of two orthogneisses yielded upper intercepts in the concordia diagram at 511±16 Ma (Chamezí crystalline complex) and 514±14 Ma (Myrsini crystalline complex). These values are interpreted as protolith ages of the gneisses, suggesting that parts of the basement underwent Cadomian (Pan-African) imprints at the northern margin of Gondwana. The lower intercept ages are attributed to Alpine subduction which led to high-pressure/low-temperature metamorphism (T=ca. 300 °C), brittle-ductile deformation, and hydrothermal fluid activity. Due to pervasive Alpine fluid migration, the zircons of the Chamezí crystalline complex display disturbed zonation and solution, resulting in 87% radiogenic Pb loss, Ca- and Al-gain, and Zr depletion.
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Acknowledgement
We thank Janina Schastok and Bernd Herrmann for help in zircon preparation. Also we are grateful to Heidi Höfer (Frankfurt University) for help with CL images and to Volker von Seckendorff (Erlangen University) for help with the EMP. Constructive reviews by P.A.M. Ustaömer and an anonymous referee are acknowledged. This work was supported by a grant of Deutsche Forschungsgemeinschaft (Zu 73–8).
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Romano, S.S., Dörr, W. & Zulauf, G. 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 (2004). https://doi.org/10.1007/s00531-004-0422-7
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DOI: https://doi.org/10.1007/s00531-004-0422-7