Publication result detail

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.

Original Title

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

English Title

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

Type

WoS Article

Original Abstract

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.

English abstract

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.

Keywords

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

Key words in English

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

Authors

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

RIV year

2018

Released

07.03.2017

Publisher

Czech Geological Society

Location

Praha

ISBN

1802-6222

Periodical

Journal of Geosciences

Volume

62

Number

1

State

Czech Republic

Pages from

1

Pages to

23

Pages count

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/"
}