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Solid Earth An interactive open-access journal of the European Geosciences Union

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https://doi.org/10.5194/se-2017-91
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
23 Aug 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Solid Earth (SE).
Multiphase Boudinage: a case study of Amphibolites in Marble in the Naxos Migmatite core
Simon Virgo, Christoph von Hagke, and Janos L. Urai Geologie – Endogene Dynamik, RWTH Aachen University, 52064 Aachen, Germany
Abstract. In multiply deformed terrains, multiphase boudinage should be common, but identification and analysis of these is difficult. Here we present an analysis of multiphase boudinage and fold structures in deformed amphibolite layers in marble from the migmatitic center of the Naxos metamorphic core complex. Reconstruction of multiple boudinage generations is possible due to the exceptional 3D outcrop conditions. We identify five distinct generations of boudinage, reflecting the transition from high-strain – high-temperature ductile deformation to medium to low strain brittle boudins on the retrograde path during cooling and exhumation. All boudin generations indicate E-W horizontal shortening and variable directions of bedding parallel extension, evolving from subvertical extension in the earliest boudins to subhorizontal N-S extension during exhumation. Two phases of E-W shortening can be inferred, indicating E-W shortening in the Aegean before activity of the brittle North Anatolian Fault. This study highlights the wealth of information that can be gained from detailed analysis of multiphase boudinage structures.

Citation: Virgo, S., von Hagke, C., and Urai, J. L.: Multiphase Boudinage: a case study of Amphibolites in Marble in the Naxos Migmatite core, Solid Earth Discuss., https://doi.org/10.5194/se-2017-91, in review, 2017.
Simon Virgo et al.
Simon Virgo et al.
Simon Virgo et al.

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Short summary
The marbles of the migmatitic dome on the island Naxos contain deformed layers of Amphibolite with multiple phases of boudinage. The boudins formed by E-W shortening normal to the layers and layer parallel extension in various directions. We identified five different generations of boudins that show that E-W shortening is the prevalent deformation in these rocks during the peak metamorphosis and the following cooling, different from other parts of the island dominated by top to North shearing.
The marbles of the migmatitic dome on the island Naxos contain deformed layers of Amphibolite...
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