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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F17%3A00095591" target="_blank" >RIV/00216224:14310/17:00095591 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1127/ejm/2017/0029-2652" target="_blank" >http://dx.doi.org/10.1127/ejm/2017/0029-2652</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1127/ejm/2017/0029-2652" target="_blank" >10.1127/ejm/2017/0029-2652</a>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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&gt; Bt&gt; Ap&gt; 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, &lt;= 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 -&gt; Be+Sc -&gt; Be+Y, HREE -&gt; 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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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&gt; Bt&gt; Ap&gt; 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, &lt;= 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 -&gt; Be+Sc -&gt; Be+Y, HREE -&gt; 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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10504 - Mineralogy

Projekt

<a href="/cs/project/GA14-13347S" target="_blank" >GA14-13347S: Variabilita lehkých prvků (Li, Be, B) ve vybraných horninotvorných a akcesorických minerálech z felsických magmatických a metamorfovaných hornin</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach<br>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

European Journal of Mineralogy

ISSN

0935-1221

e-ISSN

—

Svazek periodika

29

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

12

Strana od-do

755-766

Kód UT WoS článku

000426885400021

EID výsledku v databázi Scopus

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