Composición de las biotitas de las cortlanditas de la Sierra de Gredos, Sistema Central español.

  1. Moreno-Ventas Bravo, Ignacio
  2. Castro Dorado, Antonio
Journal:
Geogaceta

ISSN: 0213-683X

Year of publication: 1991

Issue: 10

Pages: 149-153

Type: Article

More publications in: Geogaceta

Abstract

Biotites from cortlanditic rocks of the Sierra de Gredos (Central System) were analyzed with the microprobe. The first results of this study are presented here. These include a brief discussion about the dominant coupled substitutions as a method to calculate the ferric iron in the molecula- The studied micas are phlogopites in which the cation substitutions are dominated by Ti and Al