North Patagonian Massif
| North Patagonian Massif | |
|---|---|
| Somún Cura Massif | |
| Location | Patagonia, Río Negro, Argentina |
| Coordinates | 41°13′45″S 68°19′35″W / 41.22917°S 68.32639°WCoordinates: 41°13′45″S 68°19′35″W / 41.22917°S 68.32639°W |
| Area | 100,000 km2 (39,000 sq mi) |
| Geology | Geology |
The North Patagonian Massif or Somún Cura Massif (Spanish: Macizo Norpatagónico, Macizo Nordpatagónico or Macizo de Somún Cura) is a massif in northern Patagonia located in the Argentine provinces of Río Negro and Chubut. The massif is a plateau surrounded by sedimentary basins. The North Patagonian Massif covers an area of approximately 100,000 square kilometres (39,000 sq mi). The massif rises 500 to 700 metres (1,600 to 2,300 ft) above the surrounding topography reaching a maximum of 1,200 metres (3,900 ft) above sea level. Compared to neighboring areas, the North Patagonian Massif has thicker continental crust.[1]
Stratigraphy[]
The massif consists of a basement formed by Cambro-Ordovician rocks, overlain by the Middle Silurian . The early Paleozoic section is covered by metamorphic and igneous complexes; the Permian and ,[2] and the unconformably overlying Early to Middle Jurassic . The Marifil Complex is separated from the Paleozoic sequence by the , dated to the Late Triassic with ages varying between 221 ± 12 and 207 ± 11 Ma.[3]
The Cenozoic cover of the western belt of the massif comprises the Eocene to Oligocene and in the north and the Middle to Late Miocene in the south. The eastern belt of the North Patagonian Massif contains the Miocene (Colloncuran) Collón Cura Formation, the Miocene ,[4] and the Miocene in the northern part of the eastern belt.[5]
See also[]
References[]
- ^ Gomez Dacal, Maria Laura; Tocho, Claudia; Aragon, Eugenio (2013). "Adaptación de un modelo gravimétrico tridimensional al área del macizo norpatagónico". Geoacta (in Spanish). 38 (2). Retrieved 5 January 2016.
- ^ González et al., 2014, p.175
- ^ González et al., 2014, p.176
- ^ Dalla Salda & Franzese, 1987, p.7
- ^ Dalla Salda & Franzese, 1987, p.8
Bibliography[]
- . 2014. Geología, petrografía y edad U-Pb de un enjambre longitudinal NO-SE de diques del Macizo Nordpatagónico oriental, Río Negro. Revista de la Asociación Geológica Argentina 71. 174–183. Accessed 2018-09-04.
- , and . 1987. Las megaestructuras del Macizo y Cordillera Norpatagónica argentina y la génesis de las cuencas volcano-sedimentarias terciarias. Revista Geológica de Chile 31. 3–13. Accessed 2018-09-04.
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- Landforms of Chubut Province
- Landforms of Río Negro Province
- Geology of Chubut Province
- Geology of Río Negro Province
- Plateaus of Argentina