Chemical changes associated with deformation of granites under greenschist facies conditions: the example of the Zawidów Granodiorite (SE Lusatian Granodiorite Complex, Poland)

Białek, Dawid

doi:10.1016/s0040-1951(98)00248-0

Cited by 10 publications

(3 citation statements)

References 24 publications

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“…The change in potassium content (a decrease in respect to the other rock varieties) that strongly influenced age data may be explained by transformation of biotite into chlorite and by K-feldspar breakdown and increase of white mica due to deformation. Such phenomena were observed in the rocks in the studied area, while similar relations and mechanisms were described by D. Białek in the rocks of the Zawidów complex adjacent to the studied ones (Białek, 1999). Moreover, as it results from the XRD determinations, these samples have a high component of light minerals (quartz and feldspars; Fig.…”

Section: Discussionsupporting

confidence: 84%

Radiometric Age Analyses of Rocks from the Northern Envelope of the Karkonosze Massif, the Sudetes, Poland: A Comparative Geochronological Study

2009

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K-Ar determinations have been conducted on the background of the earlier radiometric data in the eastern part of the northern Karkonosze-Izera envelope of the granite massif, composed of different varieties of granites, gneisses and mica schists. The values of the K-Ar age for minerals and rocks from the Karkonosze-Izera block lie in the wide interval ranging from 226.0±6.7 Ma to 386.1±3.0 Ma. The K-Ar age data obtained by volumetric method oscillate between 308±21 and 372±26 Ma. Most biotite K-Ar age values of the Izera granite-gneisses complex give an average age of 316.1±3.3 Ma. They correspond to the cooling age of the Karkonosze pluton while the data below 300 Ma are minimum age values that postdate the last granite intrusion of the Krkonoše-Jizera pluton. The obtained results over 300 Ma are mixed apparent ages between the age of the Karkonosze and the Izera granite ages. The K-Ar dates in the studied region have been compared with fission-track (FT) ages of zircon and titanite in the same area which display another distribution pattern.

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Section: Discussionsupporting

confidence: 84%

Radiometric Age Analyses of Rocks from the Northern Envelope of the Karkonosze Massif, the Sudetes, Poland: A Comparative Geochronological Study

2009

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“…Mylonite deformation has little influence on Nd isotopic compositions but strongly affects Sr isotopic systematics (Barovich and Patchett, 1992). The effect of mylonite deformation on major and trace elements is rather complex and different results have been attained (Kerrich et al, 1980;Bialek, 1999). Appearance of sericite, undulose extinction of quartz, and porphyroclastic feldspar in thin sections are more readily present within samples 05HL04-2 and 05HL04-3, together with their abnormal 87 Rb/ 86 Sr and I Sr ratios, evidencing the effect of deformation.…”

Section: Discussionmentioning

confidence: 99%

An Early Cretaceous garnet-bearing metaluminous A-type granite intrusion in the East Qinling Orogen, central China: Petrological, mineralogical and geochemical constraints

Zhang

She

2012

Geoscience Frontiers

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The Erlangmiao granite intrusion is located in the eastern part of the East Qinling Orogen. The granite contains almost 99 vol.% felsic minerals with accessory garnet, muscovite, biotite, zircon, and Fe-Ti oxide. Garnet is the dominant accessory mineral, shows zoned texture, and is rich in w(FeO) (14.13%e16.09%) and w(MnO) (24.21%e27.44%). The rocks have high SiO 2 , alkalis, FeO t / MgO, TiO 2 /MgO and low Al 2 O 3 , CaO with w(Na 2 O)/w(K 2 O)> 1. Their Rb, Ga, Ta, Nb, Y, and Yb contents are high and Sr, Ba, Eu, Zr, P, and Ti contents are low. These features indicate that the Erlangmiao granite is a highly evolved metaluminous A-type. Garnet crystallized at the expense of biotite from the MnO-rich evolved melt after fractionation of biotite, plagioclase, K-feldspar, zircon, apatite, and ilmenite. The relatively high initial 87 Sr/ 86 Sr ratios (0.706e0.708), low and negative 3 Nd (120 Ma) values Production and hosting by Elsevier available at www.sciencedirect.com China University of Geosciences (Beijing) GEOSCIENCE FRONTIERS journal homepage: www.elsevier.com/locate/gsf GEOSCIENCE FRONTIERS 3(5) (2012) 635e646(À6.6 to À9.0), and old Nd model ages (1.5e1.7 Ga) suggest that the rocks were probably formed by partial melting of the Paleoproterozoic granitic gneisses from the basement, with participation of depleted mantle in an extensional setting. ª 2011, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. All rights reserved.

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“…The shear zones experienced fluid migration, as evidenced by sericitization and chloritization of primary minerals. Deformation within these shear zones took place under approximately constant volume (Białek 1999a).…”

Section: Petrography Of the Zawidów Granodioritementioning

confidence: 99%

Cambrian Zawidów granodiorites in the Cadomian Lusatian Massif (Central European Variscides): what do the SHRIMP zircon ages mean?

Białek¹,

Kryza²,

Oberc-Dziedzic³

et al. 2014

J. Geosci.

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Chemical changes associated with deformation of granites under greenschist facies conditions: the example of the Zawidów Granodiorite (SE Lusatian Granodiorite Complex, Poland)

Cited by 10 publications

References 24 publications

Radiometric Age Analyses of Rocks from the Northern Envelope of the Karkonosze Massif, the Sudetes, Poland: A Comparative Geochronological Study

Radiometric Age Analyses of Rocks from the Northern Envelope of the Karkonosze Massif, the Sudetes, Poland: A Comparative Geochronological Study

An Early Cretaceous garnet-bearing metaluminous A-type granite intrusion in the East Qinling Orogen, central China: Petrological, mineralogical and geochemical constraints

Cambrian Zawidów granodiorites in the Cadomian Lusatian Massif (Central European Variscides): what do the SHRIMP zircon ages mean?

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