Abstract
In the ultra-high pressure Metamorphic Kimi Complex widespread tonalitic–trondhjemitic dykes, with an intrusion age ca. 65–63 Ma, cross-cut boudins and layers of amphibolitized eclogites. Geochemical investigation proclaims the tied genetic relationship of the amphibolitized eclogites and the associated tonalitic–trondhjemitic dykes. The major and trace element contents and rare earth element patterns of the amphibolitized eclogites indicate formation of their protoliths by fractional crystallization of tholeiitic magmas in a back-arc environment. The tonalites and trondhjemites are characterized by moderate to high Sr contents (>130 ppm), and low Y (<8.2 ppm) and heavy rare earth element contents (Yb content of 0.19–0.88 ppm). The chemical composition of the tonalitic and trondhjemitic dykes are best explained by partial melting of a tholeiitic source like the amphibolitized eclogites with residual garnet and amphibole, at the base of a thickened crust during Early Tertiary subduction/accretion at the southern margins of the European continent.
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Acknowledgments
Critical and constructive reviews by S. Jung and R. Trumbull assisted to improve this manuscript and are greatly acknowledged. We want to express our sincere thank to W.-C. Dullo for his editorial handling. J. C. M. de Hoog and an anonymous reviewer are thanked for their helpful reviews. G. Pe-Piper is thanked for her constructive comments and suggestions on an earlier version of the manuscript. G. H. Kacandes is thanked for improving the English grammar and style of the manuscript. The authors were financially supported by the Project “Pythagoras I”, co-funded by the European Social Fund (75%) and National Resources (25%), and by National Technical University of Athens for the Special Research Project “Protagoras”.
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Baziotis, I., Mposkos, E. & Perdikatsis, V. Geochemistry of amphibolitized eclogites and cross-cutting tonalitic–trondhjemitic dykes in the Metamorphic Kimi Complex in East Rhodope (N.E. Greece): implications for partial melting at the base of a thickened crust. Int J Earth Sci (Geol Rundsch) 97, 459–477 (2008). https://doi.org/10.1007/s00531-007-0175-1
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DOI: https://doi.org/10.1007/s00531-007-0175-1