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Magma mingling textures in granitic rocks of the eastern part of the Strzegom-Sobótka Massif (Polish Sudetes)

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dc.abstract.enMany granitic intrusions display evidence of magma mixing processes. The interaction of melts of contrasting composition may play a significant role during their generation and evolution. The Strzegom-Sobótka massif (SSM), located in the Sudetes (SW Poland) in the north-eastern part of the Bohemian Massif of the Central European Variscides, exhibits significant evidence of magma mingling on the macro- and micro-scales. The massif is a composite intrusion, with four main varieties: hornblende-biotite granite (with negligible amount of hornblende) and biotite granite in the western part, and two-mica granite and biotite granodiorite in the eastern part. Field evidence for magma mingling is easily found in the biotite granodiorite, where dark enclaves with tonalitic composition occur. Enclaves range from a few centimeters to half a meter in size, and from ellipsoidal to rounded in shape. They occur individually and in homogeneous swarms. The mixing textures in the enclaves include fine-grained texture, acicular apatite, rounded plagioclase xenocrysts, ocellar quartz and blade-shaped biotite. The most interesting feature of the enclaves is the presence of numerous monazite-(Ce) crystals, including unusually large crystals (up to 500 μm) which have grown close to the boundaries between granodiorite and enclaves. The crystallization of numerous monazite grains may therefore be another, previously undescribed, form of textural evidence for interaction between two contrasting magmas. The textures and microtextures may indicate that the enclaves represent globules of hybrid magma formed by mingling with a more felsic host melt. Chemical dating of the monazite yielded an age of 297±11 Ma.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorDomańska-Siuda, Justyna
dc.contributor.authorBagiński, Bogusław
dc.date.accessioned2024-01-25T05:30:46Z
dc.date.available2024-01-25T05:30:46Z
dc.date.issued2019
dc.description.financeNie dotyczy
dc.description.number1
dc.description.volume69
dc.identifier.doi10.24425/AGP.2019.126437
dc.identifier.issn0001-5709
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/111665
dc.identifier.weblinkhttps://journals.pan.pl/dlibra/publication/126437/edition/110339/content
dc.languagepol
dc.pbn.affiliationearth and related environmental sciences
dc.relation.ispartofActa Geologica Polonica
dc.relation.pages143-160
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.subject.enStrzegom-Sobótka massif
dc.subject.enGranite
dc.subject.enEnclave
dc.subject.enVariscides
dc.subject.enMagma mixing
dc.subject.enMagma mingling
dc.subject.enTextures
dc.subject.enMonazite-(Ce) crystals
dc.titleMagma mingling textures in granitic rocks of the eastern part of the Strzegom-Sobótka Massif (Polish Sudetes)
dc.typeJournalArticle
dspace.entity.typePublication