Three types of skarn in the northern part of the Moldanubian zone, Bohemian Massif - Implications for their origin

Drahota, Petr; Pertold, Zdeněk; Pudilová, Marta

doi:10.3190/jcgs.972

Cited by 7 publications

(14 citation statements)

References 16 publications

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“…It is probable that a component of marine or meteoritic water was involved. The new data compare well with the results published by Pertoldová et al (1998), Pertold et al (1997), and Drahota et al (2005) for other skarn localities in the Moldanubian Zone and the Svratka Unit. The determined δ…”

Section: The δsupporting

confidence: 81%

“…The results of petrological study of skarns in the Moldanubian Zone (Holšice, Zliv, Vápenka, and Vlastějovice localities) were reported by Potužák (1996) and Drahota et al (2005), data from MZ in south-western Moravia (Županovice) by Pertoldová (1986), and from the Gföhl Unit in MZ (Slatina and Rešice) by Pertold et al (1997).…”

Section: Moldanubian Zonementioning

confidence: 96%

“…18 O values for minerals from the Vrbík small contact metasomatic scheelite deposit (Pertold et al 2000) and from the Vápenka contact skarn band (Drahota et al 2005) exhibit distinctly higher heavy oxygen contents. The …”

Section: The δmentioning

confidence: 99%

“…Skarn bodies in the northern part of the MZ are hosted by migmatites and migmatized paragneisses. They form asymmetric bodies with longer axis of ~50-500 m and internal structures that are usually concordant with the regional structures of the enclosing paragneisses (Drahota et al 2005). The geological situation of the skarn bodies in the northern part of the MZ is presented in the Czech Geological Survey maps 1:25 000 (Hrdličková ed.…”

Section: North-eastern Part Of the Moldanubian Zonementioning

confidence: 99%

“…Skarn formation in a closed system, due to regional metamorphism of protoliths with suitable composition, was assumed in the Moldanubian Zone by Zoubek (1946), Vrána (1987), Potužák (1996), Pertold et al (1997Pertold et al ( , 2000, Drahota et al (2005) and in the Krušné hory/Erzgebirge area by Klomínský and Sattran (1963) with Kotková (1991), in the Lugicum by Pertold and Pouba (1982), and in the Svratka Unit by Pertoldová (1986) and Pertoldová et al (1998).…”

Section: Introductionmentioning

confidence: 99%

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Metamorphic history of skarns, origin of their protolith and implications for genetic interpretation; an example from three units of the Bohemian Massif

Pertoldová¹,

Týcová²,

Verner³

et al. 2012

Jour. Geosci.

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Skarns in the Svratka Unit, in the neighbouring part of the Moldanubian Zone and in the Kutná Hora Complex were studied with respect to their metamorphic evolution, major-and trace-element geochemistry, oxygen isotopic composition and zircon ages. Skarns form competent lenses and layers in metamorphosed siliciclastic rocks and preserve some early deformation structures and several equilibrium assemblages representing the products of successive metamorphic reactions. The main rock-forming minerals, garnet and clinopyroxene, are accompanied by less abundant magnetite, amphibole, plagioclase, epidote ± quartz. In the Svratka Unit the early prograde M 1 , prograde/peak M 2 , and retrograde M 3 metamorphic stages have been distinguished. Metamorphic conditions in skarns of the Moldanubian Zone are limited to a relatively narrow interval of amphibolite facies. The prograde and retrograde events in the Kutná Hora Complex skarns probably took place under amphibolite-facies conditions. The presence of magnetite and the increasing proportion of the andradite component in the garnet indicate locally increased oxygen fugacity. Skarn geochemistry does not show systematic differences in the skarn composition among the three units. The regional variations are exceeded by differences among samples from individual localities. The Al 2 O 3 /TiO 2 , Al 2 O 3 /Zr, TiO 2 /Nb ratios point to the variable proportion of the detrital material, combined in skarn protoliths with CaO and FeO, the major non-detrital components. The skarns exhibit elevated abundances of Cu, Zn, Sn and As. The Eu/Eu* ratio varies in the range of 0.5-8.6, the total REE contents vary from 8 to 345 ppm. The lowest ΣREE values (< 100 ppm) occur in skarns with magnetite mineralization. The wide intervals of ΣREE and Eu/Eu* values are interpreted to indicate variations in the temperature and redox conditions among layers of the same locality and at various localities. The oxygen isotope compositions of garnets, pyroxenes and amphiboles from skarns of the Svratka Unit exhibit a range of δ 18 O = 0.1 to 4.1 ‰. In situ (laser-ablation ICP-MS) U-Pb dating of zircon from one of the Svratka Unit skarn bodies yielded a wide range of ages (0.5-2.6 Ga), supporting the detrital origin of this zircon population. The skarn protoliths were probably rocks of mixed detrital-exhalative origin deposited on the sea floor. The geological position of skarns, with their structural and metamorphic record, probably reflect tectono-metamorphic evolution shared with that of their host rocks. The geochemical characteristics, including oxygen isotopic compositions and the presence of detrital zircons with a wide range of ages exclude metasomatic, and point to a sedimentary-exhalative mode of origin for the studied skarns.

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Section: The δsupporting

confidence: 81%

Section: Moldanubian Zonementioning

confidence: 96%

Section: The δmentioning

confidence: 99%

Section: North-eastern Part Of the Moldanubian Zonementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Metamorphic history of skarns, origin of their protolith and implications for genetic interpretation; an example from three units of the Bohemian Massif

Pertoldová¹,

Týcová²,

Verner³

et al. 2012

Jour. Geosci.

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Vibrational spectroscopic study of the mineral pitticite Fe, AsO4, SO4, H2O

Frost

Tan

et al. 2012

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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Petrology and geochemistry of the Běstvina granulite body metamorphosed at eclogite facies conditions, Bohemian Massif

Vrána¹,

Štědrá²,

Fisera³

2012

J. Geosci.

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The high-pressure granulites from the Bìstvina body contain a mineral association garnet-kyanite-biotite-plagioclase-K-feldspar-quartz ± antiperthite. Based on petrology, as well as major-and trace-element whole-rock geochemistry, the studied eight samples can be subdivided into four types: (1) metamorphosed greywacke, (2) felsic granulite with a low CaO/Na 2 O and K 2 O/Na 2 O ratio (type I), (3) felsic granulite of leucogranitic composition (type II), and (4) kyanite-garnet-biotite migmatitic gneiss. These rocks are associated with minor garnet peridotite and a crustal eclogite with a prograde metamorphic record, as described in the literature. Garnet in the quartz-feldspathic rocks typically contains 2435 mol. % Prp and 514 mol. % Grs components with Ca zoning across grains. Using compositions of garnet cores and the associated plagioclase and biotite, the geothermobarometric calculations prove the equilibration under eclogite facies conditions (P = 1.8 2.2 GPa and T = 800920 °C). Two of the samples important for thermobarometry (felsic granulites type I and II) are free of antiperthite. The associated Ky-Grt-Bt migmatitic gneiss recording conditions near 1.4 GPa and 670 °C may represent a foreign component in the Bìstvina granulite body. Although one meta-greywacke sample shows incipient replacement of garnet by biotite + plagioclase, the other samples are free of a decompression recrystallization record. Thus the granulites of the Bìstvina body stand in sharp contrast to the better known granulites in the Moldanubian Zone, by their lack of evidence for an extensive decompression recrystallization.

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Three types of skarn in the northern part of the Moldanubian zone, Bohemian Massif - Implications for their origin

Cited by 7 publications

References 16 publications

Metamorphic history of skarns, origin of their protolith and implications for genetic interpretation; an example from three units of the Bohemian Massif

Metamorphic history of skarns, origin of their protolith and implications for genetic interpretation; an example from three units of the Bohemian Massif

Vibrational spectroscopic study of the mineral pitticite Fe, AsO4, SO4, H2O

Petrology and geochemistry of the Běstvina granulite body metamorphosed at eclogite facies conditions, Bohemian Massif

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