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Petrogenesis of kyanite-quartz segregations in mica schists of the Western Tatra Mountains (Slovakia) Cover

Petrogenesis of kyanite-quartz segregations in mica schists of the Western Tatra Mountains (Slovakia)

Open Access
|Oct 2015

Abstract

In the Tatra Mountains (Slovakia) metamorphic complex, kyanite-quartz segregations with biotite-rich selvage occur in mylonitized mica schists. In this paper, the problem of fluid flow and aluminium mobility during the uplift of the crystalline massif, and the position of the segregations in the history of Western Tatra metamorphic complex, is adressed. The reaction Alm + Rt ➔ Ilm + Ky + Qtz is considered to be the result of a pressure drop from above to below 9 kbar. Ti-in-biotite geothermometry shows the temperature range to be 579-639°C that is related to heating and decompression associated with granite intrusion. Major-element mass-balance calculations show that Al remained stable in the selvage + segregation system whereas other elements (e.g. Cr, HFSE) were mobilized. The kyanite-quartz segregations formed from local fluids generated during dehydration of the metapelitic rocks during uplift. The main mechanism was likely diffusion-driven mass-transfer into extension-related cracks.

DOI: https://doi.org/10.1515/mipo-2015-0007 | Journal eISSN: 1899-8526 | Journal ISSN: 1899-8291
Language: English
Page range: 99 - 120
Submitted on: Mar 3, 2015
Accepted on: Sep 17, 2015
Published on: Oct 29, 2015
Published by: Mineralogical Society of Poland
In partnership with: Paradigm Publishing Services
Publication frequency: 1 issue per year

© 2015 Paulina Pyka, Aleksandra Gawęda, Krzysztof Szopa, Axel Müller, Magdalena Sikorska, published by Mineralogical Society of Poland
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.