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Polymetamorphic evolution of pelites inferred from tourmaline zoning – the Rędziny hornfels case study at the eastern contact of the Karkonosze Granite, Sudetes, Poland Cover

Polymetamorphic evolution of pelites inferred from tourmaline zoning – the Rędziny hornfels case study at the eastern contact of the Karkonosze Granite, Sudetes, Poland

Open Access
|Mar 2019

Abstract

Tourmaline occurring in hornfelses from the eastern envelope of the Karkonosze Granite (Western Sudetes, Poland) reveals at least two stages of crystallization expressed by its complex zoning. The cores and mantles of the crystals probably grew during prograde metamorphism under intermediate pressure-temperature conditions reflected by increasing Mg, Ti and Ca. Outermost rims show enrichment in Al and Ca, indicating growth during contact metamorphism in the presence of an Al-saturating phase. The Ti-content in biotite indicates that the temperature of the contact metamorphic event did not exceed 650ºC. The presence of andalusite and the lack of garnet and cordierite also indicates pressure conditions of ~ 2-3 kbar, typical of the C1 bathozone of Carmichael (1978) or the P1 bathozone of Pattison (2001).

DOI: https://doi.org/10.2478/mipo-2018-0003 | Journal eISSN: 1899-8526 | Journal ISSN: 1899-8291
Language: English
Page range: 17 - 34
Submitted on: Apr 20, 2017
Accepted on: Dec 10, 2017
Published on: Mar 2, 2019
Published by: Mineralogical Society of Poland
In partnership with: Paradigm Publishing Services
Publication frequency: 1 issue per year

© 2019 Jarosław Majka, Mateusz P. Sęk, Stanisław Mazur, Bożena Gołębiowska, Adam Pieczka, published by Mineralogical Society of Poland
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.