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. 2021 Oct 9;44(10):3173–3189. doi: 10.1007/s10653-021-01098-4

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© The Author(s) 2021

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Fig. 1 — Geological map of Rancagua- San Vicente de Tagua (Alfaro et al., 2017; Godoy et al., 2009). JKilp: Lo Prado Formation (Titonian–Hauterivian) formed by volcano and sedimentary sequences of marine—continental origin, EMa: Cenozoic volcanic and sedimentary sequences, Abanico Formation; Hf: River deposits (Holoceno); Hra: anthropogenic deposits; Kilc: Lower Cretaceous volcanic and sedimentary sequences, Las Chilcas Formation; Ksi: Upper Cretaceous plutonic and hypabyssal stocks; Mgh: stocks and plutons, veins and manto-veins of Miocene age; PlHa: Alluvial deposits; PlHac: piedmont alluvial deposits; PlHrm: mass transport deposits; Hf: modern fluvial deposits along the current river beds; Hra: anthropogenic deposits