Granates metamórficos alpinos en rocas metapelíticas del grupo del Mulhacén (Sierra Nevada. SE. España)
DOI:
https://doi.org/10.3989/egeol.85415-6711Keywords:
garnet, chemical composition, zoning, textures, metapelitic rocks, metamorphism, Sierra Nevada, Spain.Abstract
The Paleozoic, or older, basement and the Permo-Triassic cover of the Mulhacén group are made up mainly of metapelitic rocks. In these rocks the first alpine metamorphic phase (high P and low T) produced the breakdown of prealpine biotite and st aurolite porphyroblasts to form garnets and other minerals. These garnets are very rich in almandine endmember (Alm 82, Pyr 11, Gro 6, Spe 1) and they show Fe and Ca zoning , The main alpine phase of metamorphism (amphibolite facies) gave rise to a great amount of garnet of various textural and chemical types. Their compositions range between Alm 63-80 , Pyr 6-20, Gro 8-29, and Spe 0.3-4, and they are strongly, and sometimes complex.ly, zoned . The main factors controlling the chemical characteristics of garnets are discussed. Among these it can be emphasized : a) the host-rock chemistry, b) the metamorphic conditions, e) the oxidation ratio of the rock, d) the nucleation and growth processes, and e) the relationships with other Fe-Mg and /or Ca coexisting minerals.
Downloads
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 1985 Consejo Superior de Investigaciones Científicas (CSIC)
This work is licensed under a Creative Commons Attribution 4.0 International License.
© CSIC. Manuscripts published in both the print and online versions of this journal are the property of the Consejo Superior de Investigaciones Científicas, and quoting this source is a requirement for any partial or full reproduction.
All contents of this electronic edition, except where otherwise noted, are distributed under a Creative Commons Attribution 4.0 International (CC BY 4.0) licence. You may read the basic information and the legal text of the licence. The indication of the CC BY 4.0 licence must be expressly stated in this way when necessary.
Self-archiving in repositories, personal webpages or similar, of any version other than the final version of the work produced by the publisher, is not allowed.
