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

Published online by Cambridge University Press:  26 January 2018

Kamil Kropáč ,
Zdeněk Dolníček ,
Pavel Uher  and
Tomáš Urubek
Kamil Kropáč*
Affiliation:
Department of Geology, Faculty of Science, Palacký University, 17. listopadu 12, 77146 Olomouc, Czech Republic
Zdeněk Dolníček
Affiliation:
National Museum, Department of Mineralogy and Petrology, Cirkusová 1740, 193 00 Praha 9, Chech Republic
Pavel Uher
Affiliation:
Department of Mineralogy and Petrology, Faculty of Natural Sciences, Comenius University, Ilkovičova 6, 842 15 Bratislava, Slovak Republic
Tomáš Urubek
Affiliation:
Department of Geology, Faculty of Science, Palacký University, 17. listopadu 12, 77146 Olomouc, Czech Republic Department of Geology and Pedology, Faculty of Forestry andWood Technology, Mendel University, Zemědělská 3, 61300 Brno, Czech Republic
*
* E-mail: [email protected]
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Abstract

Fluorcaphite [SrCaCa3(PO4)3F] 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 Tichá near Frenštát pod Radhoštěm, 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 Tichá 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 ∼150 and 300°C. The initial 87Sr/86Sr 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.

Keywords

fluorcaphiteapatite supergroupstrontiumstrontium isotopeshydrothermal alterationtescheniteSilesian unitOuter Western Carpathians
Type
Research Article
Information
Mineralogical Magazine , Volume 81 , Issue 6 , December 2017 , pp. 1485 - 1501
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2017

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