IGEBA 23946
INSTITUTO DE GEOCIENCIAS BASICAS, APLICADAS Y AMBIENTALES DE BUENOS AIRES
Unidad Ejecutora - UE
artículos
Título:
CARACTERIZACIÓN ESTRUCTURAL DE FELDESPATOS POTÁSICOS DE PEGMATITAS DE LOS ALREDEDORES DE LA COCHA, GRUPO VILLA PRAGA-LAS LAGUNAS, SUBGRUPO TILISARAO-RENCA Y SUBGRUPO CONCARÁN, SAN LUIS, ARGENTINA
Autor/es:
MONTENEGRO TERESITA; LOPEZ DE LUCHI MONICA; WUL JULIETA
Revista:
Acta Geologica Lilloana
Editorial:
Fundación Miguel Lillo
Referencias:
Lugar: San Miguel de Tucuman; Año: 2016 vol. 28 p. 322 - 337
ISSN:
0567-7513
Resumen:
?Structural caracterization of potassicfeldspars from pegmatites around La Cocha,Villa Praga-Las Lagunas Group, Tilisarao-Rencasubgroup and Concarán subgroup, San Luis, Argentina?.Among 32º37?02 ?LS -65º27?28" LO and32º39?31 ?LS-65º23?36" LO there is a group ofpegmatites belonging to Villa Praga-Las LagunasGroup, Concarán and Tilisarao-Renca subgroups.These pegmatites display internal zonation and simplemineralogy consisting of quartz, feldspar, albiteand muscovite. They belong to the LCT geochemicalsignature, Rare elements class, REL-Li subclass,Beryl type. Feldspar crystals of the intermediatezones of pegmatites have centimetric to metricsizes, they are perthitic and gray to pink coloured.Structural characterization of the crystalswas performed, using information provided by XRDstudies. These data allowed us to calculate the triclinicityindex, location of Al, Si in the tetrahedralsites of the structure of the mineral and the strainindex. Feldspar crystals are highly ordered, whichimplies slow cooling, and they have a low strainindex that indicate the feldspar is slightly perthitic.
