Fig. 6: P–T-fluid evolution trajectory of the carbonated eclogite and the comparison of critical curves of H2O–CO2 (red), H2O–CH4 (blue), and H2O–N2 (green) binary systems.
From: Immiscible metamorphic water and methane fluids preserved in carbonated eclogite
a The boundary of miscibility and immiscibility of H2O and CH4 under HP-UHP conditions defined by petrological observation. b The critical curves of the low-pressure (<0.3 GPa) section modified after refs. 29,44,45. The high-pressure section modified after refs. 30,31. The metamorphic facies diagram is modified after ref. 59 The purpler area is the P–T path range of the subducted slab surface in the W1300 model from ref. 60, and the yellow green area is the P–T range recorded by the exhumed natural blueschist and eclogite from ref. 59.
