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Apatite with lamellae of sulfide and other phases in ultrahigh-pressure eclogites from Nové Dvory, Moldanubian Zone, Czech Republic

Published online by Cambridge University Press:  26 July 2018

Shah Wali Faryad ,
Radim Jedlicka  and
Maria Perraki
Shah Wali Faryad*
Affiliation:
Institute of Petrology and Structural Geology, Charles University, Prague, Albertov 12843, Czech Republic
Radim Jedlicka
Affiliation:
Institute of Petrology and Structural Geology, Charles University, Prague, Albertov 12843, Czech Republic
Maria Perraki
Affiliation:
Department of Geo-Sciences, School of Mining and Metallurgical Engineering, National Technical University of Athens, 9 Heroon Politechniou St, GR-15773, Zografou (Athens), Greece
*
*Author for correspondence: Shah Wali Faryad, Email: [email protected]
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Abstract

Exsolution lamellae of baryte, Fe sulfides, Cu sulfides and Fe oxides were observed in apatite enclosed in garnet and omphacite and their intergranular spaces in ultrahigh-pressure eclogite in the Moldanubian Zone, Czech Republic. Micro-textural relations and compositional mapping of the apatite indicates a close relationship between the density of the exsolution lamellae and compositional domains that are rich in sulfur and iron. No relation between compositional domains and fluorine or chlorine content or any evidence of apatite metasomatisation was observed. On the basis of cathodoluminescence images, the compositional domains reflect sector zoning in apatite crystals by preferential uptake of elements due to differences in surface charge and morphology on the growth plane. It is concluded that the lamellae are products of exsolution in a closed system resulting from temperature decrease during metamorphism.

Keywords

apatitesulfide and baryte exsolution lamellaeeclogiteBohemian Massif
Type
Article
Information
Mineralogical Magazine , Volume 83 , Issue 1 , February 2019 , pp. 95 - 105
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2018 

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Footnotes

Associate Editor: Makoto Arima

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