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GeoRef Categories
Era and Period
Epoch and Age
Date
Availability
Atacama Chile
Alumolukrahnite, CaCu 2+ Al(AsO 4 ) 2 (OH)(H 2 O), the aluminium analogue of lukrahnite from the Jote mine, Copiapó Province, Chile
The Application of Geologic Mapping, Core Logging, and 3-D Geoscientific Data Integration in the Exploration and Resource Expansion of Porphyry Copper-(Gold) Deposits: Examples from Recent Discoveries in Ecuador and Chile
Magnitude, timing, and rate of slip along the Atacama fault system, northern Chile: implications for Early Cretaceous slip partitioning and plate convergence
New Neogene taxa of the tribe Chlamydini Teppner, 1922 (Pectinidae, Bivalvia) of southern South America
Textures and Chemical Compositions of Magnetite from Iron Oxide Copper-Gold (IOCG) and Kiruna-Type Iron Oxide-Apatite (IOA) Deposits and Their Implications for Ore Genesis and Magnetite Classification Schemes
Huenite, Cu 4 Mo 3 O 12 (OH) 2 , a New Copper-molybdenum Oxy-hydroxide Mineral from the San Samuel Mine, Carrera Pinto, Cachiyuyo De Llampos District, CopiapÓ Province, Atacama Region, Chile
Segerstromite, Ca 3 (As 5+ O 4 ) 2 [As 3+ (OH) 3 ] 2 , the first mineral containing As 3+ (OH) 3 , the arsenite molecule, from the Cobriza mine in the Atacama Region, Chile
Of kangaroo rats and gypsum gravel: Probing the extremes of aeolian transport in the present and the past
Gypsum gravel devils in Chile: Movement of largest natural grains by wind?
Supergene Alteration in the Capricornio Au-ag Epithermal Vein System, Antofagasta Region, Chile
Soil gas geochemical exploration in covered terrains of northern Chile: data processing techniques and interpretation of contrast anomalies
Tapiaite, Ca 5 Al 2 (AsO 4 ) 4 (OH) 4 ·12H 2 O, a new mineral from the Jote mine, Tierra Amarilla, Chile
Along-strike variations in crustal seismicity and modern lithospheric structure of the central Andean forearc
The dynamics of the erosive central Andean forearc vary significantly along strike. In northern Chile at 20°S–27°S, and particularly at 22°S–25°S, the forearc in the Coastal Cordillera has been undergoing extension since at least the Pliocene, reactivating steep E-dipping faults of the Mesozoic Atacama fault system. This has been explained by forearc uplift driven by underplating, shallow slab dip, subduction of bathymetric features, and elastic rebound during the earthquake cycle. These processes, however, are active over a much wider area of the central Andean forearc than Coastal Cordillera extension and therefore cannot explain why extension is localized to the northern Chilean onshore outer forearc. We compiled crustal seismicity and the depth of lithospheric boundaries from existing studies to investigate other possible explanations for onshore forearc extension. At 22°S–25°S, seismicity increases above the background subduction-related level present to the north and south. Extensional focal mechanisms, consistent with steep E-dipping faults active at depths up to ~40 km, are also present onshore within this latitude range, but absent to the north and south; this is consistent with the distribution of mapped active fault scarps. The Salar de Atacama crust is seismically active at depths up to ~40 km. Thick lithosphere is present beneath the forearc, and the longitudinal axis of thickest lithosphere is deflected to the east at the latitude of the Salar de Atacama. To the east, the Puna Plateau lithosphere has been thinned by lithospheric removal events. The most robust correlation with onshore forearc extension is the thick, cold, strong crust and mantle lithosphere beneath the anomalous Salar de Atacama in the inner forearc of northern Chile. The combination of underplating-driven outer forearc uplift, the presence of the preexisting structure of the Atacama fault system favorable for reactivation, and the negative buoyancy beneath the Salar de Atacama is inferred to drive Coastal Cordillera normal faulting at this latitude. Recent (<10 Ma) lithospheric removal beneath the Puna Plateau to the east may have enhanced the effect of the negatively buoyant Salar de Atacama lithosphere on the forearc. This implies that both preexisting lithospheric structure and lithospheric processes in the hinterland may influence forearc dynamics.