Fluorcaphite from hydrothermally altered teschenite at Tichá, Outer Western Carpathians, Czech Republic: compositional variations and origin

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43410%2F17%3A43913019" target="_blank" >RIV/62156489:43410/17:43913019 - isvavai.cz</a>

Alternative codes found

RIV/61989592:15310/17:73584293

Result on the web

<a href="https://doi.org/10.1180/minmag.2017.081.016" target="_blank" >https://doi.org/10.1180/minmag.2017.081.016</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1180/minmag.2017.081.016" target="_blank" >10.1180/minmag.2017.081.016</a>

Result language

angličtina

Original language name

Fluorcaphite from hydrothermally altered teschenite at Tichá, Outer Western Carpathians, Czech Republic: compositional variations and origin

Original language description

Fluorcaphite [SrCaCa3(PO4)(3)F] is a rare strontium-calcium member of the apatite supergroup which was previously known only from the Khibiny and Lovozero alkaline complexes. This paper presents evidence of a third fluorcaphite occurrence. It was found in hydrothermally altered Lower Cretaceous teschenite, which forms an intrusive body (probably a sill) in the Lower Cretaceous siliciclastic flysch sediments at Ticha near Frenstat pod Radhoste.m, Silesian Unit, Outer Western Carpathians (Czech Republic). Fluorcaphite occurs as an accessory mineral in hydrothermal veins and in an adjacent alteration zone within the host teschenite. Vein-hosted fluorcaphite forms euhedral crystals and skeletal crusts enclosed in analcime while the teschenite-hosted fluorcaphite forms small overgrowths on older phenocrysts of magmatic apatite. Fluorcaphite from Ticha contains 0.50-1.97 Sr apfu, 2.96-4.49 Ca apfu, 0.59-1.09 F apfu and significantly lower Na (0.01-0.05 apfu) and LREE contents (up to 0.07 apfu). Fluorcaphite formed under hydrothermal conditions after solidification of the host teschenite during post-magmatic hydrothermal activity at temperatures probably between similar to 150 and 300 degrees C. The initial Sr-87/Sr-86 ratio of vein-hosted analcime (+)fluorcaphite (0.7063) is significantly higher than those of the host teschenite (0.7041). We therefore suggest a mix of strontium sources in the vein analcime+ fluorcaphite: (1) from the host teschenite plus (2) from external source(s) including the Lower Cretaceous seawater and/or surrounding sedimentary rocks of the Silesian Unit. These data indicate an open-system fluid regime and the participation of various fluid sources during the alteration event giving rise to fluorcaphite.

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

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2017

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

—

Volume of the periodical

81

Issue of the periodical within the volume

6

Country of publishing house

GB - UNITED KINGDOM

Number of pages

17

Pages from-to

1485-1501

UT code for WoS article

000419618300010

EID of the result in the Scopus database

2-s2.0-85038905128