Fluid flow in cataclastic thrust fault zones in sandstones, Sub-Andean Zone, southern Bolovia

International audienceThe Bolivian previous termSub-Andean Zonenext term (SAZ) corresponds to a Neogene previous termthrustnext term system that affects an about 10-km thick Palaeozoic to Neogene siliciclastic succession. The analysis of macro and microstructures and cement distribution previous termin thrust fault zonesnext term shows that they are sealed by quartz at depths >not, vert, similar3 km, due to local silica transfer by pressure-solution/precipitation activated at temperatures >70–90 °C. At shallower depths, previous termfaultsnext term have remained open and could be preferential drains for lateral previous termflownext term of carbonate-bearing previous termfluids,next term as shown by the occurrence of carbonate cements previous terminnext term fractures and their host-previous termsandstone.next term Due to decreasing burial, resulting from foothill erosion during previous termfaultnext term activity, critically buried previous termfaultnext term segments can be affected by non-quartz-sealed structures that post-date initial quartz-sealed structures. The integration of textural, previous termfluidnext term inclusion and isotopic data shows that carbonates precipitated at shallow depth (<3 km), low temperature (