<b>Secular decline in subduction geothermal gradients drives deep cycling of carbonates to subarc depths: implications from carbonate-bearing eclogites in the western Alps</b>
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<b>Table S1.</b> Solution models used for thermodynamic modelling.<b>Table S2.</b> Main mineral compositions and modal proportion (vol.%), and bulk-rock compositions of the Zermatt-Saas eclogites.<b>Table S3. </b>Representative laser Raman spectra of fluid inclusions and carbonate minerals.<b>Table S4. </b>EPM analyses for the studied eclogites.<b>Table S5. </b>The evolution of H<sub>2</sub>O and carbon in the studied eclogites in an open system during subduction and exhumation.<b>Table S6. </b>The evolution of H<sub>2</sub>O and carbon in the eclogite T94 in an open system under different oxygen fugacities during subduction and exhumation.<b>Table S7.</b> The evolution of H<sub>2</sub>O and carbon in the eclogite T94 in an open system with varying carbonate contents during subduction and exhumation.<b>Table S8. </b>The evolution of H<sub>2</sub>O and carbon in an average AOC composition in an open system at different subduction geothermal gradients.<b>Table S9. </b>The evolution of H<sub>2</sub>O and carbon in a Super Composite of AOC from ODP417/418 in an open system at different subduction geothermal gradients.<b>Table S10.</b> The slab-top P–T conditions at subarc depths in global oceanic subduction zones.
表S1：用于热力学模拟的溶液模型。 表S2：采尔马特-萨斯（Zermatt-Saas）榴辉岩的主要矿物组成、体积百分比模态占比及全岩化学成分。 表S3：流体包裹体与碳酸盐矿物的代表性激光拉曼光谱。 表S4：本次研究榴辉岩的电子探针显微分析（Electron Probe Microanalysis, EPM）数据。 表S5：开放体系下俯冲与折返过程中，本次研究的榴辉岩内H₂O与碳的演化规律。 表S6：不同氧逸度条件下，开放体系中俯冲与折返过程内榴辉岩T94内H₂O与碳的演化特征。 表S7：碳酸盐含量可变的开放体系中，俯冲与折返过程内榴辉岩T94内H₂O与碳的演化规律。 表S8：不同俯冲地热梯度下，开放体系中平均大洋地壳（Average Oceanic Crust, AOC）内H₂O与碳的演化特征。 表S9：不同俯冲地热梯度下，开放体系中来自大洋钻探计划（Ocean Drilling Program, ODP）417/418航次的AOC超级复合样品内H₂O与碳的演化特征。 表S10：全球大洋俯冲带弧下深度范围内的板块顶面温压（P–T）条件。
