Mineralogy and geochemistry of the micas from Santa Elena and El Penon pegmatities, Pampean Pegmatite Province, northwestern Argentina.

摘要

This study describes the physical and optical properties, polytypism, chemical composition and paragenesis of a Li-Al-bearing mica suite from the northernmost pegmatite field of Pampean Pegmatite Province. The micas are from two possible cogenetic rare-element pegmatite: Santa Elena, a complex-type, petalite subtype pegmatite, and El Penon, a beryl-type, beryl-columbite-phosphate subtype pegmatite. The micas are muscovite, lithian muscovite, mixed forms and lepidolite.