Hydrothermal palaeofluid circulation in the fracture network of the Baksa Gneiss Complex of SW Pannonian Basin, Hungary
作者： Krisztián Fintor , TM Tóth , Félix Schubert , None
DOI: 10.1111/J.1468-8123.2011.00327.X
关键词: Diopside 、 Gneiss 、 Albite 、 Mineralogy 、 Fluid inclusions 、 Sphalerite 、 Geochemistry 、 Geology 、 Prehnite 、 Feldspar 、 Epidote
摘要: A well-developed fracture-filling network is filled by dominantly Ca-Al-silicate minerals that can be found in the polymetamorphic rock body of Baksa Gneiss Complex (SW Hungary). Detailed investigation this vein revealed a characteristic diopside fi epidote sphalerite albite ± kfeldspar chlorite1 prehnite adularia chlorite2 chlorite3 pyrite calcite1 calcite2 calcite3 mineral succession. Thermobarometric calculations (two feldspar: 230‐336� C; chlorites: approximately 130‐300� C) indicate low-temperature formation conditions. The relative succession chlorites sequence combined with calculated temperatures reveals cooling trend during precipitation different chlorite phases (Tchlorite1: 260 32� C Tchlorite2: 222 20� Tchlorite3: 154 13� C). This supported microthermometry data primary fluid inclusions (Th: 276‐362� and 181‐359� phases. identical chemical character (0.2‐1.5 eq. wt% NaCl) these mean mineralization occurred same environment. high trace element content (e.g. As, Cu, Zn, Mn) Co ⁄Ni ratio 1‐5 grains support postmagmatic hydrothermal origin veins. microstructure composition an interconnected fracture system where crystals grew cracks. Vein formed at <200 MPa pressure conditions from 480� to around 150� C. rather characteristics 75‐124� 17.5‐22.6 CaCl2) combining special d 18 O signature which phase precipitated refer hydrological connection between crystal
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