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International Journal of Earth Sciences

, Volume 106, Issue 5, pp 1505–1524 | Cite as

Interaction between two contrasting magmas in the Albtal pluton (Schwarzwald, SW Germany): textural and mineral-chemical evidence

  • Lorenz Michel
  • Thomas Wenzel
  • Gregor Markl
Original Paper
  • 313 Downloads

Abstract

The magmatic evolution of the Variscan Albtal pluton, Schwarzwald, SW Germany, is explored using detailed textural observations and the chemical composition of plagioclase and biotite in both granite and its mafic magmatic enclaves (MMEs). MMEs probably formed in a two-step process. First, mafic magma intruded a granitic magma chamber and created a boundary layer, which received thermal and compositional input from the mafic magma. This is indicated by corroded “granitic” quartz crystals and by large “granitic” plagioclase xenocrysts, which contain zones of higher anorthite and partly crystallized from a melt of higher Sr content. Texturally, different plagioclase types (e.g. zoned and inclusion-rich types) correspond to different degrees of overprint most likely caused by a thermal and compositional gradient in the boundary layer. The intrusion of a second mafic magma batch into the boundary layer is recorded by a thin An50 zone along plagioclase rims that crystallized from a melt enriched in Sr. Most probably, the second mafic intrusion caused disruption of the boundary layer, dispersal of the hybrid magma in the granite magma and formation of the enclaves. Rapid thermal quenching of the MMEs in the granite magma is manifested by An30 overgrowths on large plagioclase grains that contain needle apatites. Our results demonstrate the importance of microtextural investigations for the reconstruction of possible mixing end members in the formation of granites.

Keywords

Mafic enclave Granite Magma chamber processes Magma mixing Plagioclase Schwarzwald 

Notes

Acknowledgments

Simone Kaulfuß is thanked for preparing the thin sections. Wolfgang Siebel, two anonymous reviewers and Editor Wolf-Christian Dullo gave thoughtful comments that improved the paper.

Supplementary material

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Supplementary material 1 (DOC 221 kb)
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Supplementary material 2 (PDF 179 kb)
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Supplementary material 3 (XLS 239 kb)
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Supplementary material 4 (XLS 155 kb)
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Supplementary material 5 (XLS 129 kb)

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© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Department of GeosciencesUniversity of TübingenTübingenGermany

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