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| Oxaya Anticline | |
|---|---|
| Name | Oxaya Anticline |
| Type | Anticline |
| Location | Andes, Arica y Parinacota Region, Chile |
| Length km | 60 |
Oxaya Anticline is a major fold structure in the high Andes of northern Chile associated with Mesozoic–Cenozoic deformation of the Central Andes. It is situated near the Altiplano and the Pacific margin and has influenced regional drainage, mining prospects, and Andean tectonics. The anticline has been the subject of structural, stratigraphic, and geophysical investigations by national and international research teams.
The anticline lies within the Andean orogen and records interactions between the Nazca Plate, South American Plate, and the Altiplano–Puna plateau, linking to studies of the Atacama Fault System, Central Volcanic Zone, and the Precordillera. Regional correlations invoke comparisons with the Main Cordillera, Coastal Cordillera, and the Bolivian Orocline, drawing on data from geologists associated with the Servicio Nacional de Geología y Minería, Universidad de Chile, and international programs such as the International Lithosphere Program. Interpretations integrate regional seismic reflection profiles, gravity surveys, and geological mapping that reference stratigraphic frameworks used in adjacent basins like the Pica Basin and the Loa River catchment.
The structure is an east–west trending asymmetrical fold with an elongated crest and limb geometries comparable to folds documented in the Altiplano, Precordillera, and Cordillera Occidental. Detailed mapping shows axial traces, hinge zones, and faults that connect to thrust systems similar to those described in the Subandean fold-and-thrust belt, Andean Retroarc, and the Frontal Cordillera. Structural analyses use methods developed by researchers at institutions such as Columbia University, Universidad de Concepción, and the Geological Survey of Canada, combining field kinematics, balanced cross-sections, and analog modeling akin to experiments from the American Journal of Science and Tectonophysics literature.
Formation models invoke Neogene shortening driven by Nazca–South America convergence and slab dynamics comparable to cases in Patagonia, the Puna, and the Sierras Pampeanas. Proposed mechanisms include thin-skinned thrusting, basement-involved folding linked to concepts from the Laramide orogeny analogs and rollback-related uplift documented in Pacific margin studies. Geodynamic interpretations reference plate reconstructions from the Paleomap Project and insights from seismic tomography groups at institutions like the University of Oxford and the Carnegie Institution for Science, integrating ideas about slab dip, crustal thickening, and lithospheric delamination.
The fold involves Mesozoic to Cenozoic sedimentary sequences correlated with formations known from regional stratigraphic charts used by the Servicio Nacional de Geología y Minería and academic syntheses from Universidad de Antofagasta. Lithologies include Cretaceous sandstones, Jurassic shales, and Tertiary volcaniclastic deposits comparable to units described in the Salar de Atacama region and the Tocopilla Basin. Petrographic and geochemical studies from teams at the University of Buenos Aires and Universidad Católica de Chile reported sediment provenance indicators that link to Paleozoic basement sources and Andean magmatic arcs such as the Central Volcanic Zone.
At the surface the structure produces topographic highs, cuesta systems, and drainage rearrangements observable in satellite imagery from NASA and the European Space Agency and in field surveys by Chilean and international geomorphologists. Erosional escarpments and depositional pediments connect to landscape evolution models developed for the Altiplano by researchers at the Max Planck Institute for Geochemistry and the University of Bern. The anticline influences local climate-driven processes studied in climate research programs led by institutions like the British Antarctic Survey and the Instituto de Estudios Andinos.
The structural trap geometry and stratigraphic architecture have been evaluated for hydrocarbon prospectivity using analogs from the Neuquén Basin and offshore basins studied by Petrobras and ENAP. Although northern Chile is better known for mineral systems, the anticline overlaps mineralized belts hosting porphyry copper, epithermal gold, and supergene copper deposits similar to those mined by CODELCO, BHP, and AngloGold Ashanti. Exploration studies by the Chilean mining sector and university research groups assess basin maturation, fluid pathways, and structural controls on mineralization referencing methodologies from the Society of Economic Geologists and Ore Geology Reviews.
Scientific work spans mapping campaigns, thermochronology, seismic profiling, and isotope geochemistry performed by teams from Universidad de Chile, Universidad de Santiago de Chile, Universidad de Concepción, and international collaborators from institutions such as the Massachusetts Institute of Technology, University of Cambridge, and the Institute of Geological and Nuclear Sciences. Key contributions include structural syntheses in regional monographs, peer-reviewed articles in journals like Tectonics and Basin Research, and theses archived at national universities. Ongoing projects integrate remote sensing from NASA’s Earth Observing System, gravity modeling informed by the Geological Survey of Canada, and multidisciplinary studies supported by CONICYT and international funding bodies.