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(2020) Deep Crustal Contamination of the Lithospheric Mantle Source to Variscan Ultrapotassic Magmas – Geochemical and Geodynamic Consequences

Janoušek V, Hora J, Erban Kochergina Y, Couzinié S, Magna T & Andronikov A


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04j: Room 1, Saturday 27th June 06:03 - 06:06

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Submitted by Changqian Ma on Wednesday 24th June 09:31
Thank you for showing a very exciting and interesting study! As you showed in the presentation, in the Variscan Belt, Ultra-K pluton and HP felsic granulites appear together. What kind of connection is there between them?
Thank you for the question. There is both spatial and temporal relation, and some trace elements, conspicuously enriched in ultrapotassic rocks, are depleted in the HP granulites (most typically Cs, U and Th). We believe that the relationship is causal. You may like to have a look into these papers of ours dealing with this topic: * Janoušek, V. and Holub, F.V., 2007. The causal link between HP–HT metamorphism and ultrapotassic magmatism in collisional orogens: case study from the Moldanubian Zone of the Bohemian Massif. Proceedings of the Geologists' Association, 118: 75-86. * Schulmann, K., Lexa, O., Janoušek, V., Lardeaux, J.M. and Edel, J.B., 2014. Anatomy of a diffuse cryptic suture zone: an example from the Bohemian Massif, European Variscides. Geology, 42: 275-278. * Janoušek, V., Hanžl, P., Svojtka, M., Hora, J.M., Erban Kochergina Y.V., Gadas, P., Holub, F.V., Gerdes, A., Verner, K., Hrdli?ková, K., Daly, J.S. and Buriánek, D., 2020. Ultrapotassic magmatism in the heyday of the Variscan Orogeny - the story of the T?ebí? Pluton, the largest durbachitic body in the Bohemian Massif. International Journal of Earth Sciences, 109: 1767-1810. [sorry for the lack of formatting, this is unfortunately beyond my control]

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