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A late hydrothermal activity in the La Cabrera granitic pluton developed in some miarolitic cavities and pegmatites several mineral associations according to the temperature decreasing. Among these associations, the calcic medium-low temperature have a special interest. They are unique in the Spanish Central System. The characteristic minerals, beside calcite, are prehnite, laumontite, heulandite-(Ca), stilbite-(Ca), chabazite( Ca), fluorapophyllite, datolite and bavenite. All minerals are characterised by X-ray diffraction and thermal analysis. Their chemical compositions are studied, including babingtonite, an accessory mineral in these associations. The maximum hydrothermal activity occurred at 250 &#194;&#177; 50&#194;&#176; C decreasing towards 140&#194;&#176; C. During the cooling an increase of fCO2 produced calcite. La actividad hidrotermal tard&#237;a que se produjo en el plut&#243;n gran&#237;tico de La Cabrera desarroll&#243; en algunas cavidades miarol&#237;ticas y pegmatitas una serie de asociaciones minerales de temperatura decreciente. Entre &#233;stas, son de especial inter&#233;s las c&#225;lcicas de media-baja temperatura, que resultan &#250;nicas en el Sistema Central Espa&#241;ol. Los minerales m&#225;s caracter&#237;sticos que aparecen en ellas, adem&#225;s de calcita, son: prehnita, laumontita, estilbita-(Ca), heulandita-(Ca), chabasita-(Ca), datolita, fluorapofilita y bavenita. Todos ellos han sido caracterizados por difracci&#243;n de rayos X y an&#225;lisis t&#233;rmico. Se contemplan tambi&#233;n sus caracter&#237;sticas qu&#237;micas, incluyendo las de la babingtonita que aparece de manera accesoria. Las condiciones de m&#225;xima actividad hidrotermal tuvieron lugar hacia 250 &#194;&#177; 50&#194;&#176; C, disminuyendo a partir de los 140&#194;&#176; C. Paralelamente al enfriamiento, se produjo un aumento de la fCO2, que provoc&#243; la formaci&#243;n de calcita

Zeolitas y minerales cálcicos de baja temperatura en las pegmatitas graníticas del plutón de La Cabrera (Sistema Central Español)