Fig. 2: Representative photomicrographs and Raman spectra of carbonate minerals in the retrograde eclogite (HB142-1) from the Western Tianshan subduction zone.
From: Immiscible metamorphic water and methane fluids preserved in carbonated eclogite
a Element iron (Fe) mapping of ankerite (Ank) illustrates the well-preserved ankerite chemical zoning. The residual bright Ank core is replaced by the darker Ank and quartz (Qz). b Enlarged BSE image showing the inclusions of lawsonite (Law), graphite (Gr), chlorite (Chl), talc (Tlc) and actinolite (Act) in Ank core in (a). c Calcite (Cal) and Qz inclusion in Ank. d Magnisite (Mgs) inclusion in Ank. e Fluid inclusions (FIs) in Ank core are parallel to the cleavage direction of Ank, belonging to primary fluid inclusions. f Fluid inclusions in Ank rim are beaded along the fracture, belonging to secondary fluid inclusions. g Raman spectra showing the differences of Raman peaks among Ank, Cal and Mgs.
