The continental margin of Uruguay: Crustal architecture and segmentation

摘要: Abstract The Uruguayan continental margin comprises three sedimentary basins: the Punta del Este, Pelotas and Oriental Plata basins, genesis of which is related to break-up Gondwana opening Atlantic Ocean. Herein Uruguay studied on basis 2D multichannel reflection seismic data, as well gravity magnetic surveys. As typical South margins, volcanic rifted type. Large wedges seaward-dipping reflectors (SDRs) are clearly recognizable in sections. SDRs, flat-lying basalt flows, a high-velocity lower crust (HVLC) form part transitional crust. SDR sequence (subdivided into two wedges) has maximum width 85 km not continuous parallel margin, but interrupted at central portion margin. oceanic highly dissected by faults, affect post-rift sediments. A depocenter over reported (deepwater Basin), cones observed few structure crust-SDRs-flat flows-oceanic reflected anomaly map. positive free-air shelf-break, while most prominent undoubtedly correlated landward edge sequence. Given attenuation, interruption and/or sinistral displacement several features (most notably sequence, anomalies depocenters), we recognize system NW–SE trending transfer here named Rio de la Transfer System (RPTS). Two tectono-structural segments separated RPTS can therefore be recognized margin: Segment I south II north.