Magmatic structures in the Krkonoše–Jizera Plutonic Complex, Bohemian Massif: evidence for localized multiphase flow and small-scale thermal–mechanical instabilities in a granitic magma chamber

Žák, Jiří; Klomínský, Josef

doi:10.1016/j.jvolgeores.2007.05.006

Cited by 51 publications

(25 citation statements)

References 36 publications

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“…Geochemical modeling of the evolution of the pluton is compatible with the emplacement sequence of Ž ák and Klomínský (2007Klomínský ( ) and Ž ák et al (2008Klomínský ( , 2009.…”

Section: Sample Selectionsupporting

confidence: 57%

Chaotic three-dimensional distribution of Ba, Rb, and Sr in feldspar megacrysts grown in an open magmatic system

Słaby

Śmigielski

Śmigielski³

et al. 2011

Contrib Mineral Petrol

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As has been demonstrated in recent years, the heterogeneities of coeval magmas can be more successfully revealed by zoned megacrysts rather than by analysis of the whole rocks hosting them. Here, the geochemical heterogeneities of feldspar megacrysts from the Karkonosze granite, Poland, are investigated by LA-ICP-MS. The crystals are the product of migration and growth in regions of poorly mixed magmas. 3D-modeling of the Ba, Sr, and Rb distributions emphasizes the importance of micro-domain growth morphologies. Two models of element behavior-a relative concentration model and a composition gradient model-provide a potentially effective tool for tracking the mixing process on a microscale. Measured concentrations of elements of different mobilities do not agree with what might be expected from the mixing of two end-member magmas. If mixing was the only process occurring, linear correlations between the concentrations of any two elements should be observed; this, however, is not the case. For combinations of any two of the three elements, modeling reveals differing non-linear correlations between concentrations. The megacryst heterogeneities provide an insight into how mixing magmas are chaotically advected to growing crystals and the degree of inter-magma element exchange between the magmas.

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“…Geochemical modeling of the evolution of the pluton is compatible with the emplacement sequence of Ž ák and Klomínský (2007Klomínský ( ) and Ž ák et al (2008Klomínský ( , 2009.…”

Section: Sample Selectionsupporting

confidence: 57%

Chaotic three-dimensional distribution of Ba, Rb, and Sr in feldspar megacrysts grown in an open magmatic system

Słaby

Śmigielski

Śmigielski³

et al. 2011

Contrib Mineral Petrol

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“…granite is characterized by the presence of K-feldspar phenocrysts a few cm in size, often mantled by albite or oligoclase, with subordinate hornblende. Traditionally, it has been called the central granite in the Polish section of Karkonosze (Borkowska 1966) and is subdivided into the Jizera and Liberec types in the Czech part (Žák and Klomínský 2007).…”

Section: Introductionmentioning

confidence: 99%

“…(ii) Equigranular, medium-grained biotite granite (the Harrachov type; Žák and Klomínský 2007) is composed of K-feldspar, quartz, plagioclase and depleted in hornblende. This variety occurs mainly in the middle of the intrusion and also in the eastern part.…”

Section: Introductionmentioning

confidence: 99%

“…This variety occurs mainly in the middle of the intrusion and also in the eastern part. (iii) Fine-grained biotite granite is very similar to variety (ii) in composition; this rock is often called the ridge (Borkowska 1966) or Karkonosze granite (Žák and Klomínský 2007). (iv) A subordinate variety granophyric granite is present as small bodies near Jelenia Góra and builds the middle part of the Rudawy Janowickie ridge near Strużnica (Borkowska 1966).…”

Section: Introductionmentioning

confidence: 99%

“…Modified after Žák et al (2013) et al 2014). Detailed information on the Karkonosze pluton is given by Kryza et al (2014), Žák and Klomínský (2007), Žák et al (2013); see also references therein.…”

Section: Introductionmentioning

confidence: 99%

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Liandratite from Karkonosze pegmatites, Sudetes, Southwestern Poland

Matyszczak

2017

Miner Petrol

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Multistage magma emplacement and progressive strain accumulation in the shallow‐level Krkonoše‐Jizera plutonic complex, Bohemian Massif

et al. 2013

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[1] Field relationships combined with new U-Pb zircon geochronology suggest that the shallow-level Krkonoše-Jizera plutonic complex, northern Bohemian Massif, was assembled successively from bottom to top, starting with emplacement of the separately evolved S-type Tanvald granite (317.3 ± 2.1 Ma), followed by at least two voluminous batches of the I-type porphyritic Liberec (319.5 ± 2.3 Ma) and Jizera (320.1 ± 3.0 Ma and 319.3 ± 3.7 Ma) granites. The intrusive sequence was completed by uppermost, minor intrusions of the equigranular Harrachov (315.0 ± 2.7 Ma) and Krkonoše granites. The I-type granites exhibit an unusually complex pattern of superposed feldspar phenocryst and magnetic fabrics as revealed from the anisotropy of magnetic susceptibility (AMS). The outer Liberec granite preserves margin-parallel foliations and lineations, interpreted to record emplacement-related strain captured by cooling from the pluton floor and walls. In contrast, the inner Jizera, Harrachov, and Krkonoše granites were overprinted by synmagmatic strain resulting from dextral movements along regional strike-slip faults cutting the opposite ends of the plutonic complex. Late-stage felsic dikes in the Liberec and Jizera granites reorient from horizontal to vertical (lineation-perpendicular) attitude in response to changing the least principal stress direction, whereas mafic schlieren do not do so, representing only randomly oriented small-scale thermal-mechanical instabilities in the phenocryst framework. In general, this case example challenges the common approach of inferring pluton-wide magma flow from interpolated foliation, lineation, and schlieren patterns. More likely, magmatic fabrics in large plutons record complex temporal succession of superposed strains resulting from diverse processes at multiple scales.

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Magmatic structures in the Krkonoše–Jizera Plutonic Complex, Bohemian Massif: evidence for localized multiphase flow and small-scale thermal–mechanical instabilities in a granitic magma chamber

Cited by 51 publications

References 36 publications

Chaotic three-dimensional distribution of Ba, Rb, and Sr in feldspar megacrysts grown in an open magmatic system

Chaotic three-dimensional distribution of Ba, Rb, and Sr in feldspar megacrysts grown in an open magmatic system

Liandratite from Karkonosze pegmatites, Sudetes, Southwestern Poland

Multistage magma emplacement and progressive strain accumulation in the shallow‐level Krkonoše‐Jizera plutonic complex, Bohemian Massif

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