Data package

Here we report the full dataset used for the manuscript Fluid Circulation in Subducted Sediments at the Base of the Seismogenic Zone: Closed vs. Open System Behavior submitted to Geochimica et Cosmocimica Acta. The dataset includes all data that appear in both the main manuscript and as supplements. The reader is referred to the Methods section for a detailed description of the analytical protocols. Contents of the file Table 1. Whole-rock trace element composition of studied metapelites from the Shimanto Belt and the Kodiak accretionary complex. RSCM, K2O and MgO results. Table 2. The average concentrations and standard deviation of trace elements in chlorite (chl), illite (ill), albite (ab), and calcite (cc) analyzed by LA-ICP-MS. Table 3. Average values and standard deviation of recovered concentrations of major, minor and trace elements in fluid inclusion populations and molar ratios for each studied formation. Thus, we report only point analyses where Ca was successfully measured. Table S1. Sample locations, pressure-temperature estimates based on Raman Spectroscopy of Carbonaceous Material and multi-phase equilibrium model, and salinity of fluid inclusions in vein samples. Literature: 1Rajič et al. (2023); 2Palazzin et al. (2016); 3Raimbourg et al. (2018); 4Raimbourg et al. (2021). Table S2. Trace element concentrations in illite (ill), albite (ab), chlorite (chl), and vein calcite (Cc) determined by LA-ICP-MS. Table S3. Chemical composition of fluid inclusions analyzed by LA-ICP-MS and semi-quantified by the charge-balance approach. B.d.l. - below detection limit; n.m. - not measured.