Fluidum migrációs események és RFF+Th ásványosodás a Soproni Csillámpala alpi metamorfózisa során
Absztrakt
Petrográfia, ásványkémiai- és fluidumzárvány-vizsgálatok segítségével négy fluidum migrációs eseményt rögzítettünk az alpi metamorfózis során az Alsó-Ausztroalpi egységbe tartozó Soproni Csillámpala Formációban.
1. Turmalinosodás a metamorfózis csúcsa után nem sokkal. (T=560-610°C, p=950-1230 MPa).
2. A leukofilliteket létrehozó Mg-metaszomatózis, amely nyírási zónák mentén ment végbe a metamorfózis csúcsa után.
3. Lokális monacit, allanit, apatit, florencit, tórit és tórianit dúsulások kvarc erekben, illetve deformációs zónák mentén. A kvarc erekben szén-dioxidot is tartalmazó hiperszalin vizes fluidumzárványokat találtunk, amelyekben Ca, K, Na, Cl, S, Mn, és ritkaföldfémeket tartalmazó fázisokat észleltünk.
4. A retrográd metamorfózis késői szakaszához köthető másodlagos, két fázisú, 25-28,5 m/m% sótartalmú vizes fluidumzárványok, melyek homogenizációs hőmérséklete 229,6-322°C.
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