Buscar
Mostrando ítems 81-90 de 694
Three-dimensional density model of the Nazca plate and the Andean continental margin
(AMER GEOPHYSICAL UNION, 2006-09-26)
We forward modeled the Bouguer anomaly in a region encompassing the Pacific Ocean (85 degrees W) and the Andean margin (60 degrees W) between northern Peru (5 degrees S) and Patagonia (45 degrees S). The three-dimensional ...
Upper-crustal architecture and record of Famatinian arc activity in the Sierra de Narváez and Sierra de Las Planchadas, NW Argentina
(Pergamon-Elsevier Science Ltd, 2021-01)
The 495 to 450 Ma Famatinian orogen, exposed throughout central and northwestern Argentina, formed from east-directed subduction under the Gondwanan margin. The Sierra de Narváez and Sierra de Las Planchadas preserve a ...
Convergent flow in a two-layer system and mountain building
(American Institute of Physics, 2010-12)
With the purpose of modeling the process of mountain building, we investigate the evolution of the ridge produced by the convergent motion of a system consisting of two layers of liquids that differ in density and viscosity ...
The Pavón Formation as the Upper Ordovician Unit Developed in a Turbidite Sand-Rich Ramp. San Rafael Block, Mendoza, Argentina
(Springer, 2017)
The Pavón Formation crops out in the central-east region of the San Rafael block; it is composed of massive green-reddish-grey sandstones, wackes, quartz sandstones, siltstones and shales. The sand-dominated facies show ...
A lithospheric velocity model for the flat slab region of Argentina from joint inversion of Rayleigh wave phase velocity dispersion and teleseismic receiver functions
(Wiley, 2015-03)
In the central Andes, the Nazca plate displays large along strike variations in dip with a near horizontal subduction angle between 28 and 32◦S referred to the Pampean flat slab segment. The upper plate above the Pampean ...
Generation of tonalitic and dioritic magmas by coupled partial melting of gabbroic and metasedimentary rocks within the deep crust of the Famatinian magmatic arc, Argentina
(Oxford University Press, 2009-05)
The source regions of dioritic and tonalitic magmas have been identified in a deep crustal section of the Famatinian arc (Sierras Pampeanas of western Argentina). The source zones of intermediate igneous rocks are located ...
Miocene to Recent collapse calderas of the southern and central volcanic zones of the Andes and their tectonic constraints
(Springer, 2021-01-30)
Central (18–28° S) and Southern (33–46° S) Andean Volcanic Zones (CVZ and SVZ, respectively) have several Miocene to Recent collapse calderas. We compare their characteristics based on published data to identify how the ...
The redox state and metal-volatile budget of primitive arc magmas: implications in the formation of ore-mineralized porphyry systems in the shalow crustEl estado redox y la contribución de metales y volátiles a partir de magmas primitivos de arco: implicancias en la formación de sistemas porfídicos mineralizados en la corteza somera
(2020)
At global scale, prominently mineralized porphyry copper systems (>40 Mt Cu)
are located exclusively along thick crustal segments (>~40 km) of active
continental margins. These magmatic-hydrothermal systems accumulate ...