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    Wyświetlanie 1-4 z 4
    Tytuł:
    Magma mingling textures in granitic rocks of the eastern part of the Strzegom-Sobótka Massif (Polish Sudetes)
    Autorzy:
    Domańska-Siuda, Justyna
    Bagiński, Bogusław
    Powiązania:
    https://bibliotekanauki.pl/articles/138640.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Strzegom-Sobótka Massif
    granite
    enclave
    Variscides
    magma mixing
    magma mingling
    textures
    monazite (Ce) crystals
    masyw Strzegom-Sobótka
    granit
    enklawa
    waryscydy
    miksacja magmy
    mieszanie magmy
    tekstury
    monacyt
    Opis:
    Many 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.
    Źródło:
    Acta Geologica Polonica; 2019, 69, 1; 143-160
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Continuous magma mixing and cumulate separation in the High Tatra Mountains open system granitoid intrusion, Western Carpathians (Poland/Slovakia): a textural and geochemical study
    Autorzy:
    Gawęda, Aleksandra
    Szopa, Krzysztof
    Włodyka, Roman
    Burda, Jolanta
    Crowley, Quentin
    Sikorska, Magdalena
    Powiązania:
    https://bibliotekanauki.pl/articles/138682.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Tatra granitoids
    magma mixing
    cumulate formation
    granitoidy tatrzańskie
    mieszanie magmy
    łączenie formacji
    Opis:
    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 cumulate formation and the squeezing of remnant melt by filter pressing points to fractional crystallization acting as a second-order magmatic process.
    Źródło:
    Acta Geologica Polonica; 2019, 69, 4; 549-570
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geochemical and fractal analysis of enclaves in the Dehe-Bala intrusion, (Northwestern Iran) : a new concept to the interpretation of crust-mantle interaction process
    Autorzy:
    Gharamohammadi, Zeynab
    Kananian, Ali
    Eliassi, Mohsen
    Powiązania:
    https://bibliotekanauki.pl/articles/2058583.pdf
    Data publikacji:
    2019
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Dehe-Bala Granodiorites
    DBG
    mafic microgranular enclaves
    MMEs
    magma mixing
    fractal dimension of enclaves
    Opis:
    The Dehe-Bala intrusion is one of the remarkable intrusions of granodiorite rocks with I-type affinity and abundant mafic microgranular enclaves (MMEs) in the Buin Zahra area, Qazvin, Iran. The MMEs, composed of diorite and quartz-monzodiorites, are haphazardly widespread in the granodiorites. The Dehe-Bala Granodiorites (DBG) usually are characterized by high contents of SiO2 (64.2-66.9), Na2O (3-3.23), K2O (3.49-4), Mg# 4.84 and Th/Ta ratio (≈7.9). In comparison to the DBG, the MMEs can be distinguished by their lower value of SiO2 (52.8-58.2), K2O (1.4-3.8) and higher Mg# (0.4-0.46). All these characteristics show a different composition of the DBG and MMEs, more importantly, can argue in favor of a magma mixing/mingling origin in the DBG. The enrichment in total REEs and HFSEs in the MMEs clearly reflects a marked diffusional process from the felsic to mafic magma that could have been achieved by chemical exchange during the magma mixing/mingling process. The fractal dimensions (Dbox) of MMEs differ from 1.14 to 1.29 with the highest frequency at 1.29. The textural heterogeneity and geochemical features combined with high Dbox values in the MMEs compared with the DBG show lower degrees of mixing/mingling between mantle-derived mafic and lower crust-derived felsic magmas.
    Źródło:
    Geological Quarterly; 2019, 63, 3; 505--521
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Digital Concentration-Distribution Models - tools for a describing heterogeneity of the hybridized magmatic mass as reflected in elemental concentration of growing crystal
    Autorzy:
    Śmigielski, M.
    Słaby, E.
    Domonik, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/138808.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cyfrowe stężenia dystrybucji modeli
    mieszanie magmy
    model cyfrowy
    raster
    wzrost kryształów
    crystal growth
    DC-DM
    EMPA
    LA-ICP-MS
    magma mixing
    Raster digital model
    Opis:
    Raster digital models (digital concentration-distribution models - DC-DMs) as interpolations of geochemical data are proposed as a new tool to depict the crystal growth mechanism in a magmatic environment. The Natural Neighbour method is proposed for interpolation of Electron Microprobe Analysis (EMPA) data; the Natural Neighbour method and Kriging method are proposed for interpolating data collected by the LA-ICP-MS method. The crystal growth texture was analysed with the application of DC-DM derivatives: 3D surface models, shaded relief images, aspect and slope maps. The magmatic mass properties were depicted with the application of solid models. Correlation between the distributions of two elements on a single crystal transect was made by operations on the obtained raster DC-DMs. The methodology presented is a universal one but it seems to be significant for the depiction of magma mixing processes and the heterogeneity of the magmatic mass.
    Źródło:
    Acta Geologica Polonica; 2012, 62, 1; 129-141
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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