Supporting Information for: Tectonosedimentary Evolution of the Middle-Late Miocene Alto Maipo Basin (Principal Cordillera, 34°S)

This repository contains the complete supplementary dataset supporting the study on the tectonosedimentary evolution of the Middle–Late Miocene Alto Maipo Basin (Principal Cordillera, ~34°S). The dataset integrates clast-composition counts, paleocurrent measurements and diagrams, U–Pb zircon geochronological data, and supporting methodological documentation used to interpret sediment provenance, depositional processes, and synorogenic basin evolution. Text SD1 provides an overview of the supplementary files and their contents. Text SD2 describes the U–Pb LA–ICP–MS analytical procedures, zircon data processing, provenance analysis, and the methods used to calculate maximum depositional ages, including TuffZirc, maximum likelihood age, and youngest single-grain approaches. Figure SD1 presents rose diagrams of paleocurrent directions derived from imbricated clasts at stations from the LLQW and BAR stratigraphic sections. The diagrams were generated using Stereonet and display the number of measurements and mean vector calculated for each station. Table SD1 contains clast-count data from the Barroso Formation, including the abundance and percentage of andesite, limestone, sandstone, and granitoid clasts at different stratigraphic heights. Table SD2 compiles paleocurrent measurements from the Los Lunes Formation, including raw and tilt-corrected directional data, bedding attitudes, measurement totals, and main flow directions for each station. Table SD3 presents the U–Pb zircon analytical dataset, including U concentrations, U/Th ratios, isotopic ratios, analytical uncertainties, and calculated ages for the analyzed samples. Together, these supplementary files provide the quantitative basis for reconstructing sediment composition and dispersal patterns, constraining maximum depositional ages, and supporting the interpretation of the Alto Maipo Basin as a synorogenic depositional system developed during Andean contraction.