Textural relations and chemical composition of minerals from a pollucite + harmotome + chabazite nodule in the Věžná I pegmatite, Czech republic

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F18%3A00106621" target="_blank" >RIV/00216224:14310/18:00106621 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00094862:_____/18:N0000031

Výsledek na webu

<a href="http://dx.doi.org/10.3749/canmin.1800014" target="_blank" >http://dx.doi.org/10.3749/canmin.1800014</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3749/canmin.1800014" target="_blank" >10.3749/canmin.1800014</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Textural relations and chemical composition of minerals from a pollucite + harmotome + chabazite nodule in the Věžná I pegmatite, Czech republic

Popis výsledku v původním jazyce

Minerals and their textural relations from a pollucite + harmotome + chabazite nodule (PHC) enclosed in a volumetrically negligible albite-pollucite unit (1-2 dm(3)) in the Veznz I beryl-columbite pegmatite were examined by EMP and XRD. The albite-pollucite unit consists of a dominant albite-lepidolite-topaz subunit (Ab + Qz + Kf + Ms + Lpd + Tpz) as a matrix surrounding minor nodular subunits: the examined PHC and triplite-apatite nodules. Small vugs with crystals of harmotome and chabazite growing from the PHC nodule and polylithionite with sokolovaite rims, albite, fluor-elbaite, and K-feldspar extending from the host albite-lepidolite-topaz subunit are locally developed at the margin. Several textural/paragenetic types of the individual minerals in the PHC were distinguished from center to margin of the nodule and vugs. The minerals exhibit very complicated textural relations varying from evident replacement of early pollucite by analcime to evident replacement of pollucite-analcime by late zeolites (hannotome + chabazite). Ilowever, the pollucite types have almost identical compositions and underwent strong analcimization along the contact with the albite-lepidolite-topaz subunit. Harmotome evolves from K-rich harmotome I (harmotome &gt; phillipsite-K) via Ca,K-moderate harmotome II to Ca,K-poor and Ba-rich harmotome III and chabazite evolves from Ca-rich chabazite I via slightly K-enriched chabazite Il to moderately K-enriched chabazite III (chabazite-Ca &gt; chabazite-K) from center to margin and vugs, respectively. Pollucite was replaced by the assemblage harmotome + chabazite according to the simplified equation pollucite + Ba + 2Ca + 25 H2O = harmotome + chabazite. The temperatures of the processes leading to the assemblage pollucite + analcime + harmotome + chabazite in the PHC were inferred from the experimental and empirical P-T stabilities of the minerals: primary pollucite T &gt; similar to 350 degrees C, analcimization T &lt; similar to 150 degrees C, harmotome + chabazite T &lt; similar to 100-150 degrees C.

Název v anglickém jazyce

Textural relations and chemical composition of minerals from a pollucite + harmotome + chabazite nodule in the Věžná I pegmatite, Czech republic

Popis výsledku anglicky

Minerals and their textural relations from a pollucite + harmotome + chabazite nodule (PHC) enclosed in a volumetrically negligible albite-pollucite unit (1-2 dm(3)) in the Veznz I beryl-columbite pegmatite were examined by EMP and XRD. The albite-pollucite unit consists of a dominant albite-lepidolite-topaz subunit (Ab + Qz + Kf + Ms + Lpd + Tpz) as a matrix surrounding minor nodular subunits: the examined PHC and triplite-apatite nodules. Small vugs with crystals of harmotome and chabazite growing from the PHC nodule and polylithionite with sokolovaite rims, albite, fluor-elbaite, and K-feldspar extending from the host albite-lepidolite-topaz subunit are locally developed at the margin. Several textural/paragenetic types of the individual minerals in the PHC were distinguished from center to margin of the nodule and vugs. The minerals exhibit very complicated textural relations varying from evident replacement of early pollucite by analcime to evident replacement of pollucite-analcime by late zeolites (hannotome + chabazite). Ilowever, the pollucite types have almost identical compositions and underwent strong analcimization along the contact with the albite-lepidolite-topaz subunit. Harmotome evolves from K-rich harmotome I (harmotome &gt; phillipsite-K) via Ca,K-moderate harmotome II to Ca,K-poor and Ba-rich harmotome III and chabazite evolves from Ca-rich chabazite I via slightly K-enriched chabazite Il to moderately K-enriched chabazite III (chabazite-Ca &gt; chabazite-K) from center to margin and vugs, respectively. Pollucite was replaced by the assemblage harmotome + chabazite according to the simplified equation pollucite + Ba + 2Ca + 25 H2O = harmotome + chabazite. The temperatures of the processes leading to the assemblage pollucite + analcime + harmotome + chabazite in the PHC were inferred from the experimental and empirical P-T stabilities of the minerals: primary pollucite T &gt; similar to 350 degrees C, analcimization T &lt; similar to 150 degrees C, harmotome + chabazite T &lt; similar to 100-150 degrees C.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10504 - Mineralogy

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

Canadian Mineralogist

ISSN

0008-4476

e-ISSN

1499-1276

Svazek periodika

56

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

CA - Kanada

Počet stran výsledku

18

Strana od-do

375-392

Kód UT WoS článku

000451744300003

EID výsledku v databázi Scopus

2-s2.0-85055792479