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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F17%3A00475498" target="_blank" >RIV/67985831:_____/17:00475498 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216305:26110/17:PU123575 RIV/00025798:_____/17:00000039 RIV/00094862:_____/17:N0000181

Výsledek na webu

<a href="http://dx.doi.org/10.3190/jgeosci.234" target="_blank" >http://dx.doi.org/10.3190/jgeosci.234</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3190/jgeosci.234" target="_blank" >10.3190/jgeosci.234</a>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

The lower crustal Gfohl Unit (Moldanubian Zone of the Bohemian Massif) consists of various felsic orthogneisses to migmatites (the so-called Gfohl gneiss) that are conunonly associated with the high-pressure felsic granulites, serpentinized gamet/spinel peridotites, garnet pyroxenites, eclogites and skanis. The relatively small skarn bodies at Vevcice 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. Major pegmatite minerals are plagioclase (An(15-14)), amphibole (K-rich hastingsite and potassic-hastingsite) and quartz, accompanied by minor K-feldspar, garnet, allanite-epidote, clinopyroxene, and accessory titanite. The pegmatites are characterized by high contents of Fe2O3tot, (11.2-17.5 wt. %), Ca2O (7.5-10.11 wt. %), Na2O (2.9-3.3 wt. %) and low contents of MgO (1.4-1.6 wt. %), K2O (1.2-1.6 wt. %), Rb (43-86 ppm). 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 degrees C and 0.7-0.8 GPa.

Název v anglickém jazyce

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

Popis výsledku anglicky

The lower crustal Gfohl Unit (Moldanubian Zone of the Bohemian Massif) consists of various felsic orthogneisses to migmatites (the so-called Gfohl gneiss) that are conunonly associated with the high-pressure felsic granulites, serpentinized gamet/spinel peridotites, garnet pyroxenites, eclogites and skanis. The relatively small skarn bodies at Vevcice 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. Major pegmatite minerals are plagioclase (An(15-14)), amphibole (K-rich hastingsite and potassic-hastingsite) and quartz, accompanied by minor K-feldspar, garnet, allanite-epidote, clinopyroxene, and accessory titanite. The pegmatites are characterized by high contents of Fe2O3tot, (11.2-17.5 wt. %), Ca2O (7.5-10.11 wt. %), Na2O (2.9-3.3 wt. %) and low contents of MgO (1.4-1.6 wt. %), K2O (1.2-1.6 wt. %), Rb (43-86 ppm). 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 degrees C and 0.7-0.8 GPa.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

<a href="/cs/project/LO1408" target="_blank" >LO1408: AdMaS UP - Pokročilé stavební materiály, konstrukce a technologie</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Geosciences

ISSN

1802-6222

e-ISSN

—

Svazek periodika

62

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

23

Strana od-do

1-23

Kód UT WoS článku

000400030700001

EID výsledku v databázi Scopus

2-s2.0-85018366428