Geochemistry of the Drahotín and Mutěnín intrusions, West Bohemian shear zone, Bohemian massif: contrasting evolution of mantle-derived melts

0356767 - GLÚ 2011 RIV AT eng J - Journal Article
Ackerman, Lukáš - Krňanská, M. - Siebel, W. - Strnad, L.
Geochemistry of the Drahotín and Mutěnín intrusions, West Bohemian shear zone, Bohemian massif: contrasting evolution of mantle-derived melts.
Mineralogy and Petrology. Roč. 99, 3/4 (2010), s. 185-199. ISSN 0930-0708. E-ISSN 1438-1168
R&D Projects: GA AV ČR KJB300130612
Institutional research plan: CEZ:AV0Z30130516
Keywords : Teplá-Barrandian * fractional crystallization * assimilation * gabbro
Subject RIV: DD - Geochemistry
Impact factor: 1.287, year: 2010

In western Bohemia, the Drahotín and Mutěnín intrusions show different origins and evolutions. Parental magmas of the Drahotín intrusion were derived predominantly from enriched mantle sources, and the melts have undergone a significant degree of assimilation-fractional crystallization during their ascent and/or emplacement into the Earth`s crust. In contrast, the compositional variation of the complex Mutěnín intrusion cannot be explained by similar processes as in the case of Drahotín intrusion, but more likely reflects the involvement of several parental magmas. The gabbronorite was derived from a depleted mantle source, whereas the diorite/syenite stem from a mixed mantle-crust reservoir. The contrasting evolution of the Drahotín and Mutěnín intrusions may be due to their melt derivation and magma emplacement under different tectonothermal regimes at different times during Variscan orogenesis.
Permanent Link: http://hdl.handle.net/11104/0195203