Detail publikačního výsledku

Origin of the pegmatite veins within the skarn body at Vevčice near Znojmo (Gföhl Unit, Moldanubian Zone)

BURIÁNEK, D.; HOUZAR, S.; KRMÍČEK, L.; ŠMERDA, J.

Originální název

Origin of the pegmatite veins within the skarn body at Vevčice near Znojmo (Gföhl Unit, Moldanubian Zone)

Anglický název

Origin of the pegmatite veins within the skarn body at Vevčice near Znojmo (Gföhl Unit, Moldanubian Zone)

Druh

Článek WoS

Originální abstrakt

The lower crustal Gföhl Unit (Moldanubian Zone of the Bohemian Massif) consists of various felsic orthogneisses to migmatites (the so-called Gföhl gneiss) that are commonly associated with the high-pressure felsic granulites, serpentinized garnet/spinel peridotites, garnet pyroxenites, eclogites and skarns. The relatively small skarn bodies at Vevčice in southern Moravia have the prevailing assemblage of medium- to coarse-grained granoblastic clinopyroxene + garnet ± amphibole ± epidote. The skarn is cut by narrow veins of diorite pegmatite (SiO2 = 46–56 wt. %) which is geochemically distinct from granitic melt generated by migmatization of surrounding orthogneisses. Whole-rock and mineral chemistry of diorite pegmatites are consistent with their origin as a product of melt infiltration from surrounding migmatites and subsequent contamination by the country-rock skarn, with or without, fractional crystallization/crystal accumulation. Similarity in composition of amphiboles in the skarn and in the pegmatite can indicate formation under similar conditions, at c. 750 °C and 0.7–0.8 GPa.

Anglický abstrakt

The lower crustal Gföhl Unit (Moldanubian Zone of the Bohemian Massif) consists of various felsic orthogneisses to migmatites (the so-called Gföhl gneiss) that are commonly associated with the high-pressure felsic granulites, serpentinized garnet/spinel peridotites, garnet pyroxenites, eclogites and skarns. The relatively small skarn bodies at Vevčice in southern Moravia have the prevailing assemblage of medium- to coarse-grained granoblastic clinopyroxene + garnet ± amphibole ± epidote. The skarn is cut by narrow veins of diorite pegmatite (SiO2 = 46–56 wt. %) which is geochemically distinct from granitic melt generated by migmatization of surrounding orthogneisses. Whole-rock and mineral chemistry of diorite pegmatites are consistent with their origin as a product of melt infiltration from surrounding migmatites and subsequent contamination by the country-rock skarn, with or without, fractional crystallization/crystal accumulation. Similarity in composition of amphiboles in the skarn and in the pegmatite can indicate formation under similar conditions, at c. 750 °C and 0.7–0.8 GPa.

Klíčová slova

diorite pegmatite; skarn; mineralogy; geochemistry; Moldanubian Zone; Bohemian Massif

Klíčová slova v angličtině

diorite pegmatite; skarn; mineralogy; geochemistry; Moldanubian Zone; Bohemian Massif

Autoři

BURIÁNEK, D.; HOUZAR, S.; KRMÍČEK, L.; ŠMERDA, J.

Rok RIV

2018

Vydáno

07.03.2017

Nakladatel

Czech Geological Society

Místo

Praha

ISSN

1802-6222

Periodikum

Journal of Geosciences

Svazek

62

Číslo

1

Stát

Česká republika

Strany od

1

Strany do

23

Strany počet

23

URL

http://www.jgeosci.org/detail/jgeosci.234/abstract/

BibTex

@article{BUT135540,
  author="BURIÁNEK, D. and HOUZAR, S. and KRMÍČEK, L. and ŠMERDA, J.",
  title="Origin of the pegmatite veins within the skarn body at Vevčice near Znojmo (Gföhl Unit, Moldanubian Zone)",
  journal="Journal of Geosciences",
  year="2017",
  volume="62",
  number="1",
  pages="1--23",
  doi="10.3190/jgeosci.234",
  issn="1802-6222",
  url="http://www.jgeosci.org/detail/jgeosci.234/abstract/"
}