Fig. 5: Representative 3D Raman images of two types of fluid inclusions in carbonated eclogite sample HB142-1 showing immiscible H2O–CH4 fluids in the Western Tianshan subduction zone.
From: Immiscible metamorphic water and methane fluids preserved in carbonated eclogite
Type-1 of H2O-rich fluid inclusions consist of liquid H2O phase and CH4 bubbles both in amphibole (a) and ankerite (b). Type-2 of CH4-rich fluid inclusions composed of gas phase CH4 and N2 both in amphibole (c) and ankerite (d, e) respectively. It should be noted that the CH4 bubbles in (b) are very active, and the 3D Raman did not capture the methane signal. We added the methane bubbles based on the position of methane observed under the polarized light microscope.
