Mineral assemblages and compositional variations in bavenite-bohseite from granitic pegmatites of the Bohemian Massif, Czech Republic

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00023272%3A_____%2F23%3A10136166" target="_blank" >RIV/00023272:_____/23:10136166 - isvavai.cz</a>

Alternative codes found

RIV/00216224:14310/23:00131000

Result on the web

<a href="https://www.cambridge.org/core/journals/mineralogical-magazine/article/abs/mineral-assemblages-and-compositional-variations-in-bavenitebohseite-from-granitic-pegmatites-of-the-bohemian-massif-czech-republic/EC645E5B296E4F81ADFA176E0CB9A2FC" target="_blank" >https://www.cambridge.org/core/journals/mineralogical-magazine/article/abs/mineral-assemblages-and-compositional-variations-in-bavenitebohseite-from-granitic-pegmatites-of-the-bohemian-massif-czech-republic/EC645E5B296E4F81ADFA176E0CB9A2FC</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1180/mgm.2023.17" target="_blank" >10.1180/mgm.2023.17</a>

Result language

angličtina

Original language name

Mineral assemblages and compositional variations in bavenite-bohseite from granitic pegmatites of the Bohemian Massif, Czech Republic

Original language description

Mineral assemblages and chemical composition of bavenite-bohseite were examined at 15 granitic pegmatites from the Bohemian Massif, Czech Republic. Three types were recognised. (i) Primary hydrothermal bavenite-bohseite crystallised in miarolitic pockets. Secondary bavenite-bohseite occurs in two distinct types: (ii) a proximal type in pseudomorphs after a primary Be-mineral (beryl &gt; phenakite, helvine-danalite), and (iii) a distal type on brittle fractures and fissures. The electron probe micro-analyses showed in addition to major constituents (Si, Ca, Al) also minor concentrations (in apfu) of Na (up 0.24), Fe (up 0.10), Mn (up 0.10), and F (up 0.36). The (i) hydrothermal miarolitic bavenite-bohseite is mostly Al-rich (2.00-0.67 apfu) relative to (ii) proximal bavenite-bohseite and bohseite after beryl, phenakite and helvine-danalite (1.56-0.46, 0.70-0.05, 1.02-0.35 apfu, respectively) and (iii) distal bavenite-bohseite typically after beryl (1.63-0.09 apfu). The Al content of the secondary (ii) proximal bavenite-bohseite is controlled by the composition of its Be-precursor whereas (iii) distal bavenite-bohseite with beryl as the Be-precursor is more variable and its composition is governed mainly by the composition of fluids. Calcium, a crucial element for the bavenite-bohseite origin, was sourced from residual pegmatite fluids (Vlastějovice, Vepice IV, Třebíč Pluton) or from external sources (e.g., Drahonín IV, Věžná I, Maršíkov). Primary (i) hydrothermal bavenite-bohseite from miarolitic pocket may have crystallised at T ~300-400 oC and P ~200 MPa whereas the secondary (ii) proximal and (iii) distal bavenite-bohseite approximately at T ~300-100 oC and P ~200-20 MPa.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10504 - Mineralogy

Project

<a href="/en/project/EF16_026%2F0008459" target="_blank" >EF16_026/0008459: Long-term research of geochemical barriers for nuclear waste disposal</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2023

Confidentiality

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

Name of the periodical

Mineralogical Magazine

ISSN

0026-461X

e-ISSN

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Volume of the periodical

87

Issue of the periodical within the volume

3

Country of publishing house

GB - UNITED KINGDOM

Number of pages

18

Pages from-to

415-432

UT code for WoS article

001007764000001

EID of the result in the Scopus database

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