J 2017

Milarite-group minerals from the NYF pegmatite Velká skála, Písek district, Czech Republic: sole carriers of Be from the magmatic to hydrothermal stage

NOVÁK, Milan, Cícha JAROSLAV, Renata ČOPJAKOVÁ, Radek ŠKODA, Michaela VAŠINOVÁ GALIOVÁ et. al.

Basic information

Original name

Milarite-group minerals from the NYF pegmatite Velká skála, Písek district, Czech Republic: sole carriers of Be from the magmatic to hydrothermal stage

Authors

NOVÁK, Milan (203 Czech Republic, guarantor, belonging to the institution), Cícha JAROSLAV (203 Czech Republic), Renata ČOPJAKOVÁ (203 Czech Republic, belonging to the institution), Radek ŠKODA (203 Czech Republic, belonging to the institution) and Michaela VAŠINOVÁ GALIOVÁ (203 Czech Republic, belonging to the institution)

Edition

European Journal of Mineralogy, STUTTGART, E SCHWEIZERBARTSCHE VERLAGSBUCHHANDLUNG, SCIENCE PUBLISHERS, 2017, 0935-1221

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10504 Mineralogy

Country of publisher

Germany

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

Impact factor

Impact factor: 1.190

RIV identification code

RIV/00216224:14310/17:00095591

Organization unit

Faculty of Science

DOI

UT WoS

000426885400021

Keywords in English

milarite; agakhanovite-(Y); EPMA; LA–ICP-MS; CL; compositional trends; beryllium; NYF pegmatite

Tags

Změněno: 9/4/2018 12:28, Ing. Nicole Zrilić

Abstract

V originále

Four distinct paragenetic, morphological and compositional types of milarite-group minerals were distinguished in the NYF pegmatite Velka skala, Pisek district, Czech Republic (Moldanubian Zone). The simply zoned (Kfs, Plg, Ab, Qz> Bt> Ap> Tur) pegmatite dike, similar to 60 cm thick, is enclosed in durbachite (K, Mg-rich melasyenite). The milarite-group minerals include: yellowish, subhedral, prismatic grains of homogeneous milarite I (milarite s. s.); prismatic subparallel aggregates of white to grayish milarite II (zoned milarite s. s. to Sc-rich milarite, up to similar to 20 mol% of the oftedalite component) from small pockets; colorless hexagonal prismatic crystals of milarite III (milarite s. s.) lining open fractures and microscopic fillings in recrystallized K-feldspar locally associated with REE-bearing minerals (allanite, aeschynite, titanite); very rare milarite IV (milarite s. s. to agakhanovite) as prismatic crystals and thin overgrowths with complex oscillatory zoning, <= 200mm in size, on crystals of milarite II and milarite III. Their mineral assemblages, textures and compositions suggest primary (magmatic) for milarite I and hydrothermal origin for milarite II, III, and IV. The simplified compositional evolution in these milarites is: Al+Ca -> Be+Sc -> Be+Y, HREE -> Be+LREE. Milaritegroup minerals are the sole carriers of Be in the pegmatite, no relics or pseudomorphs after other Be-rich minerals were found; thus milarite is now established as an additional primary Be-rich mineral in granitic pegmatites. Mineral assemblages, chemical composition of minerals and close relation to the host durbachite suggest an NYF affinity of the Velka skala pegmatite as well as a close relation to euxenite-type pegmatites of the Trebic Pluton. Milarite-group minerals from Velka Skala exhibit very similar compositional evolution to those found in the Heftetjern pegmatite, Tordal, Norway.

Links

GA14-13347S, research and development project
Name: Variabilita lehkých prvků (Li, Be, B) ve vybraných horninotvorných a akcesorických minerálech z felsických magmatických a metamorfovaných hornin
Investor: Czech Science Foundation
MUNI/A/1316/2015, interní kód MU
Name: Geologické, geodynamické a environmentální procesy východního okraje Českého masívu (Acronym: Geodyn)
Investor: Masaryk University, Category A