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

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 marginFigure 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 XFe3+ 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 XFe3+ 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 + (H2O/L).Figure S3. P–MH2O 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 XH2O from 0.04 wt% (MH2O=0) to 0.31 wt% (MH2O=1). Compositions for MH2O =0 and MH2O=1 are given in mol%. The MH2O=0 H2O proportion corresponds to a dry composition calculated from amphibole inclusions in garnet and inferred peak amphibole. The MH2O=1 H2O 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 isopleths). Uncertainties were calculated in THERMOCALC. A complete description of the mineral equilibria forward model is provided in Figure 2.9.Table S1. Representative EPMA mineral compositions for sample 90-130D. Compositions labelled '(average)' and highlighted in grey are calculated from all EPMA compositions for a given mineral or mineral generation. These average compositions are used to calculate the bulk-rock composition for sample 90-130D. Average mineral compositions are used given the equilibrated nature of the minerals in sample 90-130D. The notation (i) signifies the mineral is included in garnet or clinopyroxene. Note: EPMA compositions of ap and gth are not given since these were not used in the bulk-rock composition calculation. Mineral abbreviations after Whitney and Evans (2010).Table S2. LA–ICP–MS major and trace-element results for zircon. U-Pb isotope data is provided for zircon standards GJ, Plesovice and 91500. Trace-element data is provided for synthetic glass standard NIST-610. (bd) signifies below detection. Pb is Pb(208).Table S3. LA–ICP–MS major and trace-element results for rutile. U-Pb isotope data is provided for rutile standards R10 and R19. Major and trace-element data is provided for synthetic glass standard NIST-610. (bd) signifies below detection. Pb is Pb(208).Table S4. Approximate mineral modal proportions and calculated bulk-rock composition for 90-130D.

本材料为布朗（2024）博士论文补充内容——第2章：南极东部横贯南极山脉中部的寒武纪榴辉岩相变质作用：沿冈瓦纳东缘延伸早古生代高压变质作用记录
图S1 样品90-130D的矿物解离分析（Mineral Liberation Analysis, MLA）图像。该图像通过FEI Quanta MLA–600扫描电子显微镜获取。基于该MLA图像确定了所有矿物的模态占比。
图S2 样品90-130D在730℃下的P–Mo相图。横轴表示XFe³+占比，范围为0.04（Mo=0）至0.27（Mo=1）。Mo=0与Mo=1的成分以摩尔百分比给出。黑色粗虚线表示通过矿物电子探针显微分析（Electron Probe Micro-Analysis, EPMA）测定的XFe³+值。模态占比与成分等值线以白色虚线表示。峰期矿物组合为g + o + hb + ru + q + (H₂O/L)。
图S3 样品90-130D在690℃下的P–MH₂O相图。选取该温度是因为其覆盖了P–T视剖面图（图2.9a）中推断的模拟峰期区间。横轴表示XH₂O占比，范围为0.04 wt%（MH₂O=0）至0.31 wt%（MH₂O=1）。MH₂O=0与MH₂O=1的成分以摩尔百分比给出。MH₂O=0的H₂O占比对应由石榴石中角闪石包裹体及推断的峰期角闪石计算得到的干成分；MH₂O=1的H₂O占比对应由样品中全部角闪石总量计算得到的含水成分。灰色粗虚线表示固相线。红色粗虚线划定了P–T视剖面图（图2.9a）中推断的模拟峰期区间。模态占比与成分等值线（同样基于P–T视剖面图计算）以白色虚线表示。
图S4 样品90-130D的P–T视剖面图中矿物模态占比等值线的2σ不确定性。不确定性以包裹白色虚线（矿物模态占比等值线）的灰色多边形表示。不确定性通过THERMOCALC软件计算得到。矿物平衡正演模型的完整说明参见图2.9。
表S1 样品90-130D的代表性矿物电子探针显微分析（EPMA）成分。标注为‘(平均值)’且以灰色高亮的成分由给定矿物或矿物世代的所有EPMA成分计算得到。这些平均成分用于计算样品90-130D的全岩成分。鉴于样品90-130D中的矿物已达到平衡，故采用平均矿物成分。记号(i)表示该矿物为石榴石或单斜辉石中的包裹体。注：未给出磷灰石（ap）与榍石（gth）的EPMA成分，因其未用于全岩成分计算。矿物缩写遵循Whitney与Evans（2010）的规范。
表S2 锆石的激光剥蚀电感耦合等离子体质谱（LA–ICP–MS）主量与微量元素分析结果。提供了锆石标准物质GJ、Plesovice及91500的U-Pb同位素数据。提供了合成玻璃标准物质NIST-610的微量元素数据。记号(bd)表示低于检测限。Pb指Pb(208)。
表S3 金红石的激光剥蚀电感耦合等离子体质谱（LA–ICP–MS）主量与微量元素分析结果。提供了金红石标准物质R10与R19的U-Pb同位素数据。提供了合成玻璃标准物质NIST-610的主量与微量元素数据。记号(bd)表示低于检测限。Pb指Pb(208)。
表S4 样品90-130D的近似矿物模态占比与计算得到的全岩成分。