The stratigraphy, geochronology and paleophysiography of a Miocene fresh-water interarc basin, southern Chile

The Loncopué Trough: A Cenozoic basin produced by extension in the southern Central Andes

“…(2008) suggested that those sequences constitute a typical foreland basin associated with the steady uplift of the Andes from Late Cretaceous to Neogene times. On the contrary Spalletti and Dalla Salda (1996), Suárez and Emparán (1995), Jordan et al (2001), Radic et al (2002) and Burns (2002), among others, suggest that those depocenters were part of an intra-arc extensional basin. Most of the evidence favoring each hypothesis was based on sedimentological studies, regional basin studies, supposed progressive unconformities, and analyses of low quality 2D seismic lines.…”

“…3) (Suárez and Emparán, 1995;Jordan et al, 2001;Burns, 2002), and in the axial part of the Loncopué Trough north of 37 • 30 S (Fig. 3).…”

Andean evolution at the Guañacos and Chos Malal fold and thrust belts (36°30′–37°s)

“…The western-inner part of the Andes at these latitudes is formed by a Paleogene basin, the Cura Mallín basin (25-17 Ma; Suárez and Emparán, 1995;Jordan et al, 2001;Burns, 2002;Burns et al, 2006). The inversion of this basin was achieved in a phase of deformation during the middle to late Miocene first, and another in the late Pliocene to Quaternary that formed the Guañacos fold and thrust belt, which grew in an out-of-sequence order respect to the rest of the fold and thrust belt to the east (Figs.…”

Resistivity distribution from mid-crustal conductor to near-surface across the 1200 km long Liquiñe-Ofqui Fault System, southern Chile

“…North of the volcanic chain the batholith is slowly replaced by Eocene-Miocene volcano-sedimentary units known as the Cura-Mallín formation (Jordan et al 2001). In this time period extensional tectonics caused the formation of a sequence of sub-basins in south central Chile between 33 • -39 • S. Sedimentary thickness of up to 3000 km is documented (Radic 2010), filled with non-marine sediments intercalated with pyroclastic rocks and lava flows mainly of andesitic composition (Niemeyer & Muñoz 1983;Suarez & Emparan 1995).…”