Rutile geochemistry and thermometry of eclogites and associated garnet-mica schists in the Biga Peninsula,NW Turkey |
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| Institution: | 1. Deutsches GeoForschungsZentrum (GFZ), Section 3.2 Telegrafenberg, 14473 Potsdam, Germany;2. Institute of Geophysics and Tectonics, School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK;3. Géosciences Montpellier, Université Montpellier 2, Place Eugène Bataillon, Batîment 22, 34095 Montpellier, France;1. Vinogradov Institute of Geochemistry, Russian Academy of Sciences, Siberian Branch, Favorskogo str., 1A, Irkutsk 664033;2. Institute of Earth Sciences, Academia Sinica, 128 Academia Road Sec. 2, Nangang, Taipei 115, Taiwan;3. Sobolev Institute of Geology and Mineralogy, Russian Academy of Sciences, Siberian Branch, Koptyug ave., 3, Novosibirsk 630090, Russia;4. Novosibirsk State University, Pirogova str., 2, Novosibirsk 630090, Russia;5. Department of Geosciences, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd, Taipei 10617, Taiwan;1. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;3. GeoZentrum Nordbayern, Universität Erlangen-Nürnberg, Schlossgarten 5a, 91054 Erlangen, Germany;4. China Minmetals Corporation, Beijing 100010, China;1. Graduate School of Science and Engineering, Kagoshima University, Kagoshima, Japan;2. Department of Geosciences, National Taiwan University, Taipei, Taiwan;3. Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan;4. Department of Earth and Environmental Sciences, Bahria University, Islamabad, Pakistan;5. Department of Earth and Environmental Sciences, Potsdam University, Germany |
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| Abstract: | In northwest Turkey, high-pressure metamorphic rocks occur as exotic blocks within the Çetmi mélange located on the south of the Biga Peninsula. Rutile chemistry and rutile thermometry obtained from the eclogite and associated garnet-mica schist in the Çetmi mélange indicate significant trace element behaviour of subducted oceanic crust and source-rock lithology of detrital rutiles. Cr and Nb contents in detrital rutile from garnet-mica schist vary from 355 to 1026 μg/g and 323 and 3319 μg/g, respectively. According to the Cr-Nb discrimination diagram, the results show that 85% of the detrital rutiles derived from metapelitic and 15% from metamafic rocks. Temperatures calculated for detrital rutiles and rutiles in eclogite range from 540 °C to 624 °C with an average of 586 °C and 611 °C to 659 °C with an average of 630 °C at P = 2.3 GPa, respectively. The calculated formation temperatures suggest that detrital rutiles are derived from amphibolite- and eclogite-facies metamorphic rocks. Amphibolite-facies rocks of the Kazdağ Massif could be the primary source rocks for the rutiles in the garnet-mica schist from the Çetmi mélange. Nb/Ta ratios of metapelitic and metamafic rutiles fall between 7–24 and 11–25, respectively. Nb/Ta characteristics in detrital rutiles may reflect a change in source-rock lithology. However, Nb/Ta ratios of rutiles in eclogite vary from 9 to 22. The rutile grains from eclogites are dominated by subchondritic Nb/Ta ratios. It can be noted that subchondritic Nb/Ta may record rutile growth from local sinks of aqueous fluids from metamorphic dehydration. |
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| Keywords: | Rutile Source-rock lithology Zr-in-rutile High-pressure NW Turkey |
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