Fluid infiltration effects on stable isotope systematics of the Susurluk skarn deposit, NW Turkey

Orhan, A., Mutlu, H. and Fallick, A. (2011) Fluid infiltration effects on stable isotope systematics of the Susurluk skarn deposit, NW Turkey. Journal of Asian Earth Sciences, 40(2), pp. 550-568. (doi: 10.1016/j.jseaes.2010.10.009)

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A calcic skarn deposit occurs along the contact zone between Oligo-Miocene Çataldağ 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. δ<sup>18</sup>O of anhydrous minerals within proximal and distal zones indicate that skarn-forming fluids had a magmatic origin. The δ<sup>18</sup>O 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. δ<sup>18</sup>O 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 H<sub>2</sub>O-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.

Item Type:Articles
Keywords:Susurluk skarn deposit; contact metamorphism; fluid infiltration; isotopic depletion
Glasgow Author(s) Enlighten ID:Fallick, Professor Anthony
Authors: Orhan, A., Mutlu, H., and Fallick, A.
Subjects:G Geography. Anthropology. Recreation > GE Environmental Sciences
College/School:College of Science and Engineering > Scottish Universities Environmental Research Centre
Journal Name:Journal of Asian Earth Sciences
ISSN (Online):1878-5786
Published Online:09 November 2010

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