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Fig. 3 | Swiss Journal of Geosciences

Fig. 3

From: Polyphase movement on the Lavanttal Fault Zone (Eastern Alps): reconciling the evidence from different geochronological indicators

Fig. 3

Meso- and microscale fabrics representative for the internal structure of the LFZ from drilling KB-D13/02 (depth 61.3–66 m). a Polished drill core section (KB-D13/02, depth 61.3–61.7 m), with the transition from a paragneiss protolith and an adjacent DZ to a cataclastic fault core. For location of drilling site, see Fig. 2. b Protolith microstructure representing the original fabrics, slightly modified by transecting shear bands (KB-D13/02, depth 61.3). qu quartz, plag plagioclase, ms muscovite, zir zircon. c Microstructure from the DZ–fault core transition, showing HR fragments bordered by shear fractures and partly surrounded by fine-grained fault gouge (dark) (KB-D13/02, depth 61.5). d Microstructure from the fault core, showing a matrix-supported cataclasite. The matrix (dark) mainly consists of clay minerals and ultrafine-grained quartz, the embedded fragments are derived from the protolith (KB-D13/02, depth 61.6). e Close-up view of the DZ–fault core transition, showing the development of shear fractures and cataclastic shear zones (KB-D13/02, depth 61.45). f Polished drill core section from drilling KB-D13/02 (depth 66 m) with a cataclastic shear zone bordered by strongly altered, bleached HR mainly consisting of albite (from Wölfler et al. 2010, modified). Photos b–d were taken with crossed polarizing filters

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