%0 Journal Article
%T Isotopic mass balance of metamorphic fluids in the Gogo 車w每Jordan車w serpentinite massif, Lower Silesia, SW Poland
%A Adam MYDˋOWSKI
%J Annales Societatis Geologorum Poloniae
%D 2009
%I Geological Society of Poland
%X This work aims at estimation of the amount of metamorphic fluids which led to the present-day variability of isotopic compositions, 汛D and 汛18O, in serpentinites from the Gogo 車w每Jordan車w Massif. This goal was achieved by means of a numerical model reproducing selected features of geological environment and a computer application supporting this model. The Gogo 車w每Jordan車w Massif consists of peridotites transformed to a different degree into serpentinites and subject to brittle deformation that produced a complex fracture system. The potential tectonic control on the pattern of the fluid migration paths was investigated using palaeostress analysis based on slickenside measurements. Isotopic analyses were carried out for hydrogen and oxygen from serpentine, oxygen from magnetite, and hydrogen and oxygen from carbonates. The variability of 汛D and 汛18O in the serpentinites along the modelled migration paths demonstrates that serpentinization of peridotites was caused by fluids derived from at least three sources revealing different isotopic characteristics. Fluids produced during the magmatic-hydrothermal stage played a major role in serpetinization, since they represent approximately 95% of all fluids interacting with the rock. In contrast, oceanic water represents only 1% of fluids involved in serpenti- nization. The calculated mean amount of fluid required for serpentinization of 1 m3 of peridotite is equal to 98 ℅ 104 kg.
%K serpentinization
%K stable isotope
%K tectonics
%K numerical modelling
%K Gogo 車w每Joradan車w Massif
%K Lower Silesia
%K SW Poland
%U http://www.asgp.pl/2009/79_2/147-158.html