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Nomarski study of zoned plagioclases from granitoids of the Seville Range Batholith, SW Spain; petrogenetic implications

Antonio Castro and Jesus D. de la Rosa
Nomarski study of zoned plagioclases from granitoids of the Seville Range Batholith, SW Spain; petrogenetic implications
European Journal of Mineralogy (October 1994) 6 (5): 647-656

Abstract

The Nomarski imagery method can reveal resorption surfaces showing dramatic changes in conditions during magma consolidation. The distribution of these resorption surfaces across the crystals is related to changes in the anorthite content of the melt in an open system induced by magma mixing. These features are typical of hybrid granitic rocks, such as the granodiorites and tonalites of the Seville Range batholith. In these rocks, previous geochemical and isotopic studies indicate mixing between a felsic end-member and a fractionated mantle-derived magma at a shallow depth in the crust. The cyclicity of resorption processes, repeated several times during plagioclase growth, is consistent with some kind of self-organized process related to convection induced by mafic-magma input in the composite magma chamber. Alternatively, cyclicity may be related to repeated pulses of mafic magma.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 6
Serial Issue: 5
Title: Nomarski study of zoned plagioclases from granitoids of the Seville Range Batholith, SW Spain; petrogenetic implications
Affiliation: Universidad de Huelva, Departamento de Geologia, Huelva, Spain
Pages: 647-656
Published: 199410
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 23
Accession Number: 1994-054182
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch maps
N36°49'60" - N38°13'00", W06°32'60" - W04°40'00"
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199424
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