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.
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Published
1985-12-30
How to Cite
Velilla, N. (1985). Granates metamórficos alpinos en rocas metapelíticas del grupo del Mulhacén (Sierra Nevada. SE. España). Estudios Geológicos, 41(5-6), 271–288. https://doi.org/10.3989/egeol.85415-6711
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