Fluidos asociados a la formación de epidota + (clorita + cuarzo) en las pegmatitas del plutón de La Cabrera (Sistema Central Español)

Abstract

Fluids related to the epidote+chlorite+quartz and calcite (Flaumont/te) alterations present in the cores of pegmatites from La Cabrera pluton have been determined. Two types of fluids are involved: a) Alow salinity (0.4-4.5 wt% NaCI equiv.) NaCI-H20 fluid is the responsable for the first type ofalteration. Temperature was probably dose to 300°C. b) A moderate to high salinity (15.3-24.5 wt% Nad equiv.) heterogeneous (liquid + gas) CaCi2-NaCt-H20 fluid was involved in the second alteration under conditions of PffM probably very dose to hydrostatic. These alterations probably took place as discrete hydrothermal events of different ages