Make a P–T–t diagram based on this information from the eclogite province of the Bergen Arcs (for references, see Bingen et al., 2004): (1) Granulite facies: almost 1 GPa and 800–850 °C at ~930 Ma (U-Pb ages of zircon). (2) Eclogite facies: 1.8–2.1 GPa and ~700 °C at 423 ± 4 Ma (U-Pb zircon rim crystallization age). (3) Amphibolite facies retrogressive shearing: 0.8–1.2 GPa and ~690 °C at 409 ± 8 Ma (Rb/Sr).

Other ages: Dikes predating amphibolite facies shearing:

422 ± 6 Ma to 428 ± 6 Ma (Rb/Sr) and 418 ± 9(U-Pb).