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Swiss Journal of Geosciences
Fig. 6 | Swiss Journal of Geosciences

Fig. 6

From: Blueschist mylonitic zones accommodating syn-subduction exhumation of deeply buried continental crust: the example of the Rocca Canavese Thrust Sheets Unit (Sesia–Lanzo Zone, Italian Western Alps)

Fig. 6

Microstructures in orthogneisses (ZR19). a Kfs1 porphyroclast wrapped by S2 marked by Wm2 and Jd1. Plane polarized light. Long side of the microphotograph = 3.3 mm. b Back-Scattered Electron (BSE) image showing Kfs1 porphyroclast wrapped by S2 marked by Wm2 and Jd1. Jd1 is rimmed by lighter Jd2. c Jd1 crystal rimmed by Jd2 and Wm1 crystals at very low angle to Wm2 underlying the S2 foliation. Plane polarized light. Long side of the microphotograph = 0.86 mm. d Crossed polar image of photograph c. Wm1 crystals show undulose extinction and transverse LPO with respect to S2. Long side of the microphotograph = 0.86 mm. e Large Kfs1 porphyroclast with Grt1 and Jd2 crystals at the rim. Plane polarized light. Long side of the microphotograph = 0.86 mm. f Back-Scattered Electron (BSE) image showing Grt1 and Jd1 crystals wrapped by the S2 foliation marked by Wm2, Jd2, Ttn1 and smaller Grt1 grains

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