The Sklené garnet peridotite: petrology, geochemistry, and structure of a mantle-derived boudin in Moldanubian granulite

0337040 - GLÚ 2010 RIV JP eng J - Journal Article
Medaris Jr., G. - Ackerman, Lukáš - Jelínek, E. - Toy, V. - Siebel, W. - Tikoff, B.
The Sklené garnet peridotite: petrology, geochemistry, and structure of a mantle-derived boudin in Moldanubian granulite.
Journal of Geosciences. Roč. 54, č. 4 (2009), s. 301-323. ISSN 0449-2560
R&D Projects: GA AV ČR KJB300130902
Institutional research plan: CEZ:AV0Z30130516
Keywords : peridotite * LPO * geochemistry * radiogenic isotopes * PT conditions * Moldanubian
Subject RIV: DD - Geochemistry

The Moldanubian Sklené garnet peridotite, which preserves mineralogical, geochemical, and structural evidence for a protracted mantle evolution, is a small boudin (1 m) enclosed by granulite of the Gföhl Assemblage. The peridotite has a porphyroclastic texture, in which large garnet and smaller olivine and pyroxene porphyroclasts reside in a fine-grained, recrystallized matrix of olivine, pyroxene, and pargasitic amphibole). By comparison with other Moldanubian garnet peridotites in the Czech Republic, the Sklené peridotite likely represents a fragment of subcontinental lithospheric mantle. It experienced early partial fusion and depletion of incompatible elements at moderate pressure in the spinel stability field, followed by transport to high-pressure conditions. Subsequently, the depleted peridotite was metasomatized by transient, primitive basaltic melts, with the addition of Rb, Th, U, Pb, and Sr.
Permanent Link: http://hdl.handle.net/11104/0181130