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Title: Continuous magma mixing and cumulate separation in the High Tatra Mountains open system granitoid intrusion, Western Carpathians (Poland/Slovakia) : a textural and geochemical study
Authors: Gawęda, Aleksandra
Szopa, Krzysztof
Włodyka, Roman
Burda, Jolanta
Crowley, Quentin
Sikorska, Magdalena
Keywords: Tatra granitoids; Magma mixing; Cumulate formation
Issue Date: 2019
Citation: Acta Geologica Polonica, 2019, no. 4, s. 549-570
Abstract: In this study the formation of the polygenetic High Tatra granitoid magma is discussed. Felsic and mafic magma mixing and mingling processes occurred in all magma batches composing the pluton and are documented by the typical textural assemblages, which include: mafic microgranular enclaves (MME), mafic clots, felsic clots, quartz-plagioclase-titanite ocelli, biotite-quartz ocelli, poikilitic plagioclase crystals, chemically zoned K-feldspar phenocrysts with inclusion zones and calcic spikes in zoned plagioclase. Geochemical modelling indicates the predominance of the felsic component in subsequent magma batches, however, the mantle origin of the admixed magma input is suggested on the basis of geochemical and Rb-Sr, Sm-Nd and Pb isotopic data. Magma mixing is considered to be a first-order magmatic process, causing the magma diversification. The cu-mulate formation and the squeezing of remnant melt by filter pressing points to fractional crystallization acting as a second-order magmatic process.
DOI: 10.24425/agp.2019.126447
ISSN: 2300-1887
Appears in Collections:Artykuły (WNP)

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