Fluid infiltration effects on stable isotope systematics of the Susurluk skarn deposit,NW Turkey |
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| Authors: | Ay?e Orhan Halim Mutlu Anthony E Fallick |
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| Institution: | 1. Eski?ehir Osmangazi University, Department of Geological Engineering, Eski?ehir 26480, Turkey;2. Isotope Geosciences Unit, Scottish Universities Environmental Research Centre, East Kilbride, Rankine Avenue, Glasgow G75 0QF, Scotland, United Kingdom;1. Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;2. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;3. Advanced Analytical Centre, James Cook University, Townsville, QLD 4811, Australia;1. Department of Geology, Faculty of Sciences, University of Zanjan, Zanjan 45195–313, Iran;2. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;3. CAS Center for Excellence in Tibetan Plateau Earth Science, Beijing 100101, China;4. University of Chinese Academy of Sciences, Beijing 100049, China;1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;2. Department of Earth and Planetary Sciences, McGill University, 3450 Quebec, Canada;3. Department of Geology, University of Patras, Rion, 26500 Patras, Greece;4. Lituo Mining Company, Chifeng 024000, China;1. Institute of Geochemistry and Petrology, ETH Zurich, 8092 Zurich, Switzerland;2. Department of Geosciences, Virginia Tech, Blacksburg, VA 24061, USA |
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| Abstract: | A calcic skarn deposit occurs along the contact zone between Oligo-Miocene Çatalda? Granitoid and Mesozoic limestones in Susurluk, northwestern Turkey. The skarn zone with little or no retrograde stage is represented by fluid inclusions with high homogenization temperatures (up to >600 °C) and a wide range of salinity (12 to >70 wt.% NaCl). Pluton-derived fluids facilitated occurrence of continuous prograde reactions in the country rocks (particularly in the proximal zone) and oxygen isotopic depletion in calc-silicate and calcite minerals. δ18O of anhydrous minerals within proximal and distal zones indicate that skarn-forming fluids had a magmatic origin. The δ18O values are 5.93–9.08‰ (mean 6.8‰) for garnet, 4.08–9.94‰ (mean 6.4‰) for pyroxene, 4.89–7.92‰ (mean 6.4‰) for wollastonite and 6.65–8.28‰ (mean 7.5‰) for vesuvianite. Temperatures estimated by isotopic compositions of mineral pairs are significantly lower than those measured from the fluid inclusions, indicating that isotopic equilibrium is not preserved between the skarn minerals. δ18O and δ13C values are systematically depleted from marbles to skarn carbonates. Calc-silicate forming reactions and permeability increase triggered by volatilization and consequent strong infiltration of H2O-rich siliceous fluids into the system promoted fluid–rock interaction causing isotopic resetting and isotopic depletion of silicates (e.g. pyroxene and wollastonite) and skarn calcites. |
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