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Swiss Journal of Geosciences
Fig. 12 | Swiss Journal of Geosciences

Fig. 12

From: Structural and metamorphic evolution of a subducted passive margin: insights from the Briançonnais nappes of the Western Alps (Ubaye–Maira valleys, France–Italy)

Fig. 12

Microstructural features. a Calcite type I-II twins in the Châtelet unit (sample DT1); b Dynamic recrystallization on S3 foliation of calcite in the Combe-Brémond unit (sample DT30); c Partially recrystallized calcite crystals with an elongated shape, interpreted as calcite pseudomorphs on aragonite (sample DT14); d Dynamic recrystallization of quartz grains by “bulging” I (BLG1) mechanism (sample DT21); e SPO and LPO developed in quartz-rich schists at a short distance from Schistes Lustrés thrust contact, recrystallized by “bulging” (BLGII; sample DT33); f Ceillac backthrust calc-mylonite (sample DT7); the oblique foliation in respect to S3 indicated by the calcite grain shape (Sb) suggests a top-to-the-NE sense of shear; g Aiguille Grande base thrust indicating a top-to-the-SW sense of shear, inferred from the oblique foliation of calcite (Sb), (sample DT8); h Chillol thrust folded D2 mylonitic quartzite (sample DT9); an apparent top-to-the-NE sense of shear is inferred from S-C fabric (corresponding to a restored top-to-the SW kinematic in pre-D3 geometry)

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