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Table 8 Thermobarometric estimates obtained using independent thermometers and barometers and referred to successive metamorphic events (D1–M1 and D2–M2)

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)

Method Garnet-bearing gneiss Orthogneiss
Metamorphic event D1–M1 D2–M2 D1–M1 D2–M2
Green and Hellman (1982) 470 ± 30 °C 445 ± 40 °C 480 ± 50 °C 430 ± 50 °C
Wu et al. (2002) 507 ± 40 °C 473 ± 50 °C 490 ± 50 °C 440 ± 50 °C
XJd content in Cpx (Holland, 1980) (minimum pressure) 1.25 ± 0.1 GPa   1.26 ± 0.14 GPa 1.04 ± 0.02 GPa
Massonne and Schreyer (1987) (minimum pressure) 1.17 ± 0.2 GPa 1.0 ± 0.1 GPa 1.3 ± 0.16 GPa 1.14 ± 0.12 GPa
Mineral composition isopleth thermobarometry on PT pseudosection 520 °C at 1.28 GPa 490 °C at 1.04 GPa   400 °C at 1.07 GPa