Paragenesis, composition and origin of Ba- and Ca-rich stronalsite, a rare strontium tectosilicate, in the rocks of the teschenite association, Silesian Unit, Western Carpathians, Czech Republic

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00023272%3A_____%2F25%3A10136962" target="_blank" >RIV/00023272:_____/25:10136962 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.cambridge.org/core/journals/mineralogical-magazine/article/paragenesis-composition-and-origin-of-ba-and-carich-stronalsite-a-rare-strontium-tectosilicate-in-rocks-of-the-teschenite-association-silesian-unit-western-carpathians-czech-republic/C71FA506C847C107AC37ED99FCBDACFB" target="_blank" >https://www.cambridge.org/core/journals/mineralogical-magazine/article/paragenesis-composition-and-origin-of-ba-and-carich-stronalsite-a-rare-strontium-tectosilicate-in-rocks-of-the-teschenite-association-silesian-unit-western-carpathians-czech-republic/C71FA506C847C107AC37ED99FCBDACFB</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1180/mgm.2024.97" target="_blank" >10.1180/mgm.2024.97</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Paragenesis, composition and origin of Ba- and Ca-rich stronalsite, a rare strontium tectosilicate, in the rocks of the teschenite association, Silesian Unit, Western Carpathians, Czech Republic

Popis výsledku v původním jazyce

The Ba- and Ca-rich stronalsite [ideally SrNa2Al4Si4O16] rarely occurs in pseudomorphs probably after nepheline in hydrothermally altered Sr-enriched leucocratic dykes or streaks hosted by mesocratic amphibole-pyroxene teschenite in the Silesian Unit (Flysch Belt of the Western Carpathians, Czech Republic). In addition to stronalsite, the pseudomorphs consist of slawsonite, celsian, biotite, muscovite, alkali feldspar, natrolite, and thomsonite-Ca. The surrounding groundmass is rich in alkali feldspars and zeolites and sporadically also contains amphibole phenocrysts, chloritized biotite, fluorapatite and other accessory and/or secondary minerals. Both compositional types of stronalsite show identical Raman spectra. The Ba-rich stronalsite contains 0.55-0.83 apfu Sr, 0.12-0.37 apfu Ba, and &lt;0.08 apfu Ca. In contrast, Ca-rich stronalsite contains 0.65-0.82 apfu Sr, 0.10-0.23 apfu Ca, and &lt;0.06 apfu Ba. The substitution mechanisms by which Ca enters the structure of stronalsite could not be satisfactorily clarified from the available data; the best stoichiometric fit suggests for substitution of Sr, which should not be allowed due to different crystal structure of Ca-analog of stronalsite, lisetite [ideally CaNa2Al4Si4O16]. The Na contents range 1.82-2.42 apfu and the K contents are always low (&lt;0.09 apfu). The T site contains 3.91-4.26 apfu Si, 3.76-4.00 apfu Al and 0.00-0.11 apfu Fe3+. The main source of Sr was probably primary magmatic plagioclase, which underwent hydrothermal alteration by post-magmatic high-temperature brines mixed with fluids of external origin. Based on previous research and paragenetic relationships, we estimate that stronalsite crystallized at T ~250-320 oC and P &lt;100 MPa.

Název v anglickém jazyce

Paragenesis, composition and origin of Ba- and Ca-rich stronalsite, a rare strontium tectosilicate, in the rocks of the teschenite association, Silesian Unit, Western Carpathians, Czech Republic

Popis výsledku anglicky

The Ba- and Ca-rich stronalsite [ideally SrNa2Al4Si4O16] rarely occurs in pseudomorphs probably after nepheline in hydrothermally altered Sr-enriched leucocratic dykes or streaks hosted by mesocratic amphibole-pyroxene teschenite in the Silesian Unit (Flysch Belt of the Western Carpathians, Czech Republic). In addition to stronalsite, the pseudomorphs consist of slawsonite, celsian, biotite, muscovite, alkali feldspar, natrolite, and thomsonite-Ca. The surrounding groundmass is rich in alkali feldspars and zeolites and sporadically also contains amphibole phenocrysts, chloritized biotite, fluorapatite and other accessory and/or secondary minerals. Both compositional types of stronalsite show identical Raman spectra. The Ba-rich stronalsite contains 0.55-0.83 apfu Sr, 0.12-0.37 apfu Ba, and &lt;0.08 apfu Ca. In contrast, Ca-rich stronalsite contains 0.65-0.82 apfu Sr, 0.10-0.23 apfu Ca, and &lt;0.06 apfu Ba. The substitution mechanisms by which Ca enters the structure of stronalsite could not be satisfactorily clarified from the available data; the best stoichiometric fit suggests for substitution of Sr, which should not be allowed due to different crystal structure of Ca-analog of stronalsite, lisetite [ideally CaNa2Al4Si4O16]. The Na contents range 1.82-2.42 apfu and the K contents are always low (&lt;0.09 apfu). The T site contains 3.91-4.26 apfu Si, 3.76-4.00 apfu Al and 0.00-0.11 apfu Fe3+. The main source of Sr was probably primary magmatic plagioclase, which underwent hydrothermal alteration by post-magmatic high-temperature brines mixed with fluids of external origin. Based on previous research and paragenetic relationships, we estimate that stronalsite crystallized at T ~250-320 oC and P &lt;100 MPa.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10504 - Mineralogy

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Mineralogical Magazine

ISSN

0026-461X

e-ISSN

—

Svazek periodika

89

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

13

Strana od-do

357-369

Kód UT WoS článku

001554146100001

EID výsledku v databázi Scopus

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