"Linked orogen-oblique fault zones in the central Argentine Andes : the basis of a new model for Andean orogenesis and metallogenesis"

The evolution of the high‐elevated depocenters of the northern Sierras Pampeanas (ca. 28˚ SL), Argentine broken foreland, South‐Central Andes: the Pipanaco Basin

“…), which probably represents the largest relief along the foreland. This topographic step in the Sierras Pampeanas is located at the same spot where low‐temperature thermochronology yielded the youngest cooling ages in the broken foreland, <8 Ma (Coughlin, ).…”

“…), a minimum exhumation of ca.7.5 km would be expected since the Late Miocene along the northern margin of the Pipanaco basin. This estimation is supported by low‐temperature thermochronology and burial studies (Coughlin, ; Collo et al ., ), which yields Miocene cooling ages of <8 Ma (the youngest record in the Sierras Pampeanas), preserved under very low geotherms <17°C/km (Collo et al ., ). Such thermal conditions would require 5–7 km of exhumation to exhume rocks from below the apatite fission‐track closure temperature (between 120°C and 90°C, Reiners et al ., ).…”

“…This basement deformation correlates chronologically with the apatite fission‐track cooling ages between ca. 7.6 and 3 Ma recorded at the southern flank of the Capillitas ranges, along the northern margin of the Pipanaco basin (Coughlin, ).…”

“…This interpretation is consistent with apatite fission‐track ages of ca . 7.6–4.2 Ma (Coughlin, ) in the Sierra de Capillitas, located a few kilometres east of Farallón Negro and at approximately the same elevation.…”

Detrital zircons from late Paleozoic accretionary complexes in north-central Chile (28°–32°S): Possible fingerprints of the Chilenia terrane

“…Also a set of detrital ages within a volcano-sedimentary succession at the base of the Carboniferous near Jagüe (27 S), has allowed identification of a large dominant detrital peak at 336 Ma , whereas a recent date on a primary volcanic flow within the same interval yielded 336 AE 0.06 Ma (Gulbranson et al, 2010). Within this same region, in Sierra de Las Minitas, Coughlin (2000) dated several bi-modal dykes intruding folded Early Devonian rocks yielding an age range between 364 and 346 Ma. Plutons largely bracketed between 360 and 325 Ma and similar petrological characteristics intrude the basement of the Sierras Pampeanas further to the east (Dahlquist et al, 2006Grosse et al, 2008).…”