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Título

Origine des grenats des roches calco-alcalines du Sud-Est de l'Espagne

Autor López Ruiz, J.; Rodríguez Badiola, Eduardo ; García Cacho, L.
Palabras clave Calc-alkaline rocks
dacites - rhyodacites
garnets almandine
SE Spain
Fecha de publicación sep-1977
EditorSpringer
Citación Bulletin of Volcanology Volume 40, Number 3 1-12
ResumenTertiary dacites and rhyodacites in SE Spain contain garnets, both as phenocrysts in the lavas and within their enclosed metamorphic xenoliths. Microprobe analyses show that calc-alkaline and metamorphic rocks garnets are quite similar in composition (almandine-rich). However, the zoning patterns displayed in the two types of garnets differ. Garnets included in lavas show normal zoning (or a slight enrichment of Mn at the borders), while garnets in xenoliths have Mn-enriched rims or reverse zoning. The differences in zonation, as well as in petrographic features, indicate that the garnets in volcanic rocks crystallized directly from the calc-alkaline magma at an early stage of its crystallization. On the other hand, the uniform composition of dacitic and rhyodacitic garnets, as well as its low pyrope and grossular content, suggest that the conditions in which the garnets crystallized were rapidly exceeded.
Descripción Los auteurs remercient le docteur V. ARAÑA de l'Institut Lucas Mallada (C.S.I.C.) la lecture critique du manuscrit. Le docteur F. DIMANCHE de l'Université de Liége a réalisé la traduction en français du travail.
Versión del editorhttp://dx.doi.org/10.1007/BF02596996
URI http://hdl.handle.net/10261/3209
DOI10.1007/BF02596996
ISSN0366-483X
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