Mobility of metamorphic fluids inferred from infrared microspectroscopy on natural fluid inclusions: the example of Tinos Island,Greece |
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| Authors: | Famin Vincent Nakashima Satoru Jolivet Laurent Philippot Pascal |
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| Institution: | (1) Laboratoire de Tectonique, case 129. , Université Pierre and Marie Curie Paris VI. 4, place Jussieu, 75252 Paris Cedex 05, France;(2) Interactive Research Center of Science. Graduate School of Science and Engineering, Tokyo Institute of Technology, O-okayama 2-12-1, Meguro, Tokyo 152-8551, Japan;(3) CNRS, Laboratoire de Géosciences Marines, IPGP, Case 89. , Université Pierre and Marie Curie Paris VI. 4, place Jussieu, 75252 Paris Cedex 05, France |
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| Abstract: | OH structure of metamorphic fluids has been studied by high temperature infrared (IR) microspectroscopy on natural fluid inclusions contained in quartz veins, over the temperature range 25–370 °C. Blueschist-facies veins from Tinos island core complex (Cyclades, Greece) display H2O–NaCl–CaCl2–CO2 inclusions whereas greenschist-facies veins contain H2O–NaCl ± CO2 inclusions. From 25 to 370 °C, peak positions of OH stretching IR absorption bands increase quasi-linearly with slopes of 0.25 and 0.50 cm–1 °C–1 for inclusions trapped under blueschist and greenschist conditions, respectively. Extrapolation to 400 °C yield peak positions of 3,475 cm–1 for blueschist inclusions and 3,585 cm–1 for greenschist inclusions. Because the smaller wave number indicates the shorter hydrogen-bond distance between water molecules, fluids involved in the greenschist event have a  loose structure compared with blueschist fluids. We suggest that these properties might correspond to a low wetting angle of fluids. This would explain the high mobility of aqueous fluids suggested by structural observation and stable isotope analysis.Editorial responsibility: J. Hoefs |
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