Escapolita hidrotermal en anfibolita de la zona de Las Bateas, departamento Colón (Córdoba)

COLOMBO, FERNANDO

San Juan

Congreso; XI Congreso de Mineralogía y Metalogenia; 2013

Asociación Mineralógica Argentina y Universidad Nacional de SanJuan

Veinlets composed of scapolite (%Me 67.3 - 75.7), diopside, amphibole (magnesiohornblende, pargasite and edenite), clinozoisite (or zoisite) and calcite crosscut amphibolite in Las Bateas, Colón Department, Córdoba. Scapolite occurs as pale greyish brown crystals bound by {110}. It contains up to 1.16 wt.% SO3 (0.13 SO4 apfu). No systematic compositional variation between crystal core and rim was detected. Unit cell dimensions (space group P42/n) are a =  12.1486(13), c = 7.5667(9) Å , V = 1116.8(2) Å3.  Prehnite and actinolite are secondary phases. The primary association of the host amphibolite was altered, with scapolitization of plagioclase (chemically indistinguishable from vein scapolite), chloritization of biotite and formation of rims of hydrothermal around metamorphic amphibole. The mineral association described in this contribution is the result of metasomatism of amphibolite by S-, Cl- and CO2-rich solutions.