<abstract xmlns="http://www.w3.org/1999/xhtml"><p>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.</p></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.

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

University of Silesia, Faculty of Earth Sciences, ul. Będzińska 60, 41-200 Sonowiec, Poland

Geological Survey of Norway (NGU), Leiv Eirikssons vei 39, 7040 Trondheim, Norway

Polish Geological Institute, Rakowiecka 4, Warsaw, Poland

Mineralogia

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

In the Tatra Mountains (Slovakia) metamorphic complex, kyanite-quartz segregations with biotite-rich selvage occur in mylonitized mica schists. In this paper,...

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

Publié en ligne: 29 oct. 2015

Pages: 99 - 120

Reçu: 03 mars 2015

Accepté: 17 sept. 2015

DOI: https://doi.org/10.1515/mipo-2015-0007

Mots clés
kyanite-quartz segregation, aluminium mobilization, mass-balance, Tatra Mountains

© 2014 Paulina Pyka et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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

Publié en ligne: 29 oct. 2015

Pages: 99 - 120

Reçu: 03 mars 2015

Accepté: 17 sept. 2015

DOI: https://doi.org/10.1515/mipo-2015-0007

Mots cléskyanite-quartz segregation, aluminium mobilization, mass-balance, Tatra Mountains

© 2014 Paulina Pyka et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Mots clés
kyanite-quartz segregation, aluminium mobilization, mass-balance, Tatra Mountains