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Fig. 5 | Swiss Journal of Geosciences

Fig. 5

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. 5

Microstructures in garnet-free gneiss (CR115). a Jd1 porphyroclasts wrapped by the S2 mylonitic foliation marked by Wm2 and Jd2. Plane polarized light. Long side of the microphotograph = 3.3 mm. b Same subject in crossed polars. Long side of the microphotograph = 3.3 mm. c Millimetre-Scale aggregates of Jd1, with crystals oriented at high angle with the S2 foliation, rimmed by Jd2 and wrapped by the S2 foliation marked by Wm2 and Jd2. Plane polarized light. Long side of the microphotograph = 3.3 mm. d Crossed polars image photograph c. Long side of the microphotograph = 3.3 mm. e Back-Scattered Electron (BSE) image showing Jd1 and Wm1 porphyroclasts. Jd1 is rimmed by lighter Jd2. Bt1 is enclosed in Wm1 and Cpx1 within Wm1, with rationale boundaries. Wm1 is rimmed by Wm2 which marks the foliation together with Ep2. f Back-Scattered Electron (BSE) image of Jd1 porphyroclast rimmed by Jd2 and wrapped by the S2 foliation marked by Wm2, Ep2, Ttn1 and Qz. g Small Gln1 rims on Jd1 and Jd2 crystals. Plane polarized light. Long side of the microphotograph = 0.86 mm. h Back-Scattered Electron (BSE) image of microsite indicated by the white square in photograph c. The aggregates of Jd1 crystals are partially replaced by light Jd2. Cpx2 exsolutions mark the crystal boundaries of Jd

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