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Mineralogy and Petrology

, Volume 99, Issue 3–4, pp 185–199 | Cite as

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

  • Lukáš Ackerman
  • Martina Krňanská
  • Wolfgang Siebel
  • Ladislav Strnad
Original Paper

Abstract

In western Bohemia, the Drahotín (gabbro-diorite) and Mutěnín (gabbronorite-diorite-syenite) intrusions show different origins and patterns of geochemical evolution. 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 (AFC) during their ascent and/or emplacement into the crust. In contrast, the compositional variation of the complex Mutěnín intrusion cannot be explained by simple AFC processes, 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.

Keywords

Olivine Fractional Crystallization Parent Magma Alkaline Rock Flame Atomic Absorption Spectrometry 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

The authors are greatly indebted to Zdeněk Vejnar for the help in the field, Jana Rajlichová for technical assistance, Gordon Medaris for grammatical corrections and Elmar Reitter for Rb-Sr and Sm-Nd isotope analyses. This research was supported by the Grant Agency of the Academy of Sciences, project No. KJB300130612, the Scientific Programme CEZ: AV0Z30130516 of the Institute of Geology, Acad. Sci. CR and the Scientific Programme of Ministry of Education: MSM0021620855.

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Lukáš Ackerman
    • 1
    • 2
  • Martina Krňanská
    • 3
  • Wolfgang Siebel
    • 4
  • Ladislav Strnad
    • 5
  1. 1.Institute of Geology v.v.i.Academy of Sciences of the Czech RepublicPraha 6Czech Republic
  2. 2.Czech Geological SurveyGeologická 6Praha 5Czech Republic
  3. 3.Faculty of Science, Institute of Geochemistry, Mineralogy and Mineral ResourcesCharles UniversityPraha 2Czech Republic
  4. 4.Institute of GeosciencesEberhard-Karls-University TübingenTübingenGermany
  5. 5.Faculty of Science, Laboratories of the Geological InstitutesCharles UniversityPraha 2Czech Republic

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