Supplemental Material: Cambrian eclogite-facies metamorphism in the central Transantarctic Mountains, East Antarctica: extending the record of early Palaeozoic high-pressure metamorphism along the eastern Gondwanan margin

• Main Author: Dillon Brown
• Format: Dataset
• Language: unknown
• Published: 2024
• Subjects: Geochronology; Igneous and metamorphic petrology; HP metamorphism; Eclogite; Ross Orogen; Gondwana; Cambrian; Antarctica; East Antarctica; Transantarctic Mountains; Antarc*
• Online Access: https://doi.org/10.25909/25530004.v1; https://figshare.com/articles/dataset/Supplemental_Material_Cambrian_eclogite-facies_metamorphism_in_the_central_Transantarctic_Mountains_East_Antarctica_extending_the_record_of_early_Palaeozoic_high-pressure_metamorphism_along_the_eastern_Gondwanan_margin/25530004

Supplementary material for Brown (2024), PhD thesis - Chapter 2 - Cambrian eclogite-facies metamorphism in the central Transantarctic Mountains, East Antarctica: extending the record of early Palaeozoic high-pressure metamorphism along the eastern Gondwanan margin Figure S1. Mineral Liberation Analysis (MLA) image of sample 90-130D. Image obtained using an FEI Quanta MLA–600 scanning electron microscope. Modal proportions of all minerals were determined from this MLA image. Figure S2. P–Mo section for sample 90-130D at a temperature of 730°C. The horizontal axis shows the proportion of X Fe3+ from 0.04 (Mo=0) to 0.27 (Mo=1). Compositions for Mo=0 and Mo=1 are given in mol%. The bold dashed black line indicates the X Fe3+ value determined from mineral EPMA analyses. Modal proportion and compositional isopleths are shown as dashed white lines. The peak assemblage is g + o + hb + ru + q + (H 2 O/L). Figure S3. P–M H2O section for sample 90-130D at a temperature of 690°C. This temperature was chosen because it encompasses the inferred modelled peak field in the P–T pseudosection (Fig. 2.9a). The horizontal axis shows the proportion of X H2O from 0.04 wt% (M H2O =0) to 0.31 wt% (M H2O =1). Compositions for M H2O =0 and M H2O =1 are given in mol%. The M H2O =0 H 2 O proportion corresponds to a dry composition calculated from amphibole inclusions in garnet and inferred peak amphibole. The M H2O =1 H 2 O proportion corresponds to a hydrous composition calculated from the total amount of amphibole in the sample. The bold dashed grey line indicates the solidus. The bold dashed red line borders the inferred modelled peak fields as show in the P–T pseudosection (Fig. 2.9a). Modal proportion and compositional isopleths (which are also calculated for the P–T pseudosection) are shown as dashed white lines. Figure S4. 2σ uncertainties on mineral modal proportion isopleths from the P–T pseudosection for 90-130D. Uncertainties are represented as grey polygons encompassing the white dashed lines (mineral modal proportion ...