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| Meseta del Somuncurá | |
|---|---|
| Name | Meseta del Somuncurá |
| Location | Río Negro Province, Chubut Province, Argentina |
| Area km2 | 15000 |
| Elevation m | 600–1200 |
| Geology | volcanic plateau |
Meseta del Somuncurá is a large volcanic plateau in northern Patagonia spanning Río Negro Province and Chubut Province in Argentina. The plateau lies between the Atlantic Ocean and the Andes, forming a distinct biogeographic unit characterized by high levels of endemism, isolated steppe-like landscapes, and sparse human settlement. It has been the focus of research by institutions such as the Universidad Nacional del Comahue, the CONICET, and international teams studying biogeography, paleontology, and conservation biology.
The plateau occupies parts of the Argentine Mesopotamia-adjacent plains and the northeastern edge of the Patagonian Desert, bounded by landmarks including the Valcheta basin, the Colorado River basin, and the foothills near Ñorquinco. Major nearby settlements and administrative centers include Maquinchao, Ingeniero Jacobacci, Darwin, Río Negro, and Pilcaniyeu, with access routes linked to the National Route 23 (Argentina), Provincial Route 6 (Río Negro), and secondary roads toward Comodoro Rivadavia. Neighboring physiographic units include the Somuncurá Basin formations, the San Javier ranges, and the transitional zones toward Meseta de Somuncurá Sur and the Valle del Río Negro. The plateau’s remoteness contrasts with nearby extraction sites such as the Comodoro Rivadavia oil field and grazing areas linked historically to estancias like Estancia La Adela.
The plateau comprises late Cretaceous to Cenozoic volcanic and sedimentary sequences related to regional tectonics involving the Andean orogeny and the opening of the South Atlantic Ocean. Dominant lithologies include basalts, andesites, and volcaniclastics, with intrusive bodies comparable to those recorded in the Deseado Massif and the Neuquén Basin. Erosional landforms such as mesas, escarpments, and pediments are analogous to structures in the Patagonian Plateau and the Andean precordillera. Paleosols and fossiliferous strata have yielded vertebrate remains comparable to assemblages from the Santa Cruz Formation and the Sarmiento Formation, informing regional stratigraphic correlations with units studied near Paleontological sites of Argentina.
The plateau experiences a cold semi-arid to temperate steppe climate influenced by the Falkland Current, westerly Southern Hemisphere westerlies, and rain-shadow effects of the Andes. Annual precipitation is low and highly seasonal, resembling patterns recorded in Bariloche, San Carlos de Bariloche, and Trelew but modified by elevation. Mean temperatures vary across altitudinal gradients similar to those in Neuquén Province montane zones. Hydrologically, the area hosts endorheic basins, intermittent streams, and shallow aquifers connected to regional systems such as the Colorado River basin and tributaries feeding the Negro River (Río Negro). Springs and wetlands support riparian corridors comparable to those in the Campos del Tuyú and act as refugia for aquatic taxa known from Patagonian lakes.
The plateau is a hotspot of vertebrate, invertebrate, and plant endemism, with floras related to the Patagonian steppe and relict taxa comparable to those in the Valdivian temperate rain forest transition zones. Notable plant genera include representatives akin to Adesmia, Senecio, and Baccharis, alongside endemic species reminiscent of taxa described from Monte Desert localities. Faunal elements include small mammals analogous to Dolichotis, Lepus europaeus introductions, and endemic rodents comparable to Graomys and Phyllotis; herpetofauna show affinities with genera like Liolaemus and Phymaturus. Birdlife includes species overlapping ranges with Rhea americana, Chloephaga picta, Lessonia rufa, and other Patagonian specialists recorded in surveys by Aves Argentinas. Invertebrate endemism includes orthopterans and coleopterans with parallels to taxa from the Southern Cone faunal provinces.
Archaeological evidence links pre-Columbian occupation to hunter-gatherer groups associated with broader regional cultures known from Patagonia archaeology, with lithic assemblages comparable to findings at sites in Cueva de las Manos and shell midden records like those near Peninsula Valdés. Ethnohistoric records mention indigenous peoples comparable to the Mapuche, Tehuelche, and Puelche groups interacting with Spanish colonial expeditions such as those led by Juan de Garay and later frontier dynamics involving figures like Cruz de los Andes expeditions. Colonial and post-colonial land use introduced sheep ranching tied to estancias and transport networks connected to Bahía Blanca and Puerto Madryn. 20th-century developments include scientific expeditions by institutions like the Museo Argentino de Ciencias Naturales and surveying by Argentine military road projects.
Land use is dominated by extensive sheep and goat grazing similar to patterns in Patagonia, with localized mineral exploration activities paralleling those in the Deseado Massif and hydrocarbon fields near Golondrina. Conservation efforts involve initiatives by provincial governments of Río Negro Province and Chubut Province, NGOs such as Aves Argentinas and collaborations with universities including Universidad Nacional de la Patagonia San Juan Bosco. Threats include overgrazing, invasive species like Lepus europaeus and Avena fatua-type grasses, altered fire regimes observed elsewhere in Patagonian ecosystems, and potential mining pressure analogous to disputes in Andacollo and Famatina.
Research on the plateau has been conducted by teams from CONICET, international collaborations with institutions such as the Smithsonian Institution, Natural History Museum, London, and universities including Universidad de Buenos Aires, focusing on paleontology, biogeography, and ecology. Protected areas and proposals include provincial reserves and private conservation initiatives modeled on the Parque Interjurisdiccional Marino Costero Patagonia Austral and the Reserva Provincial La Payunia frameworks. Ongoing monitoring programs involve remote sensing with satellites like Landsat and Sentinel-2, biodiversity inventories by organizations such as WWF Argentina and fieldwork supported by the Museo Paleontológico Egidio Feruglio. Conservation strategies reference international conventions including the Convention on Biological Diversity and regional planning by the Comisión Nacional de Actividades Espaciales for land-use mapping.
Category:Landforms of Río Negro Province Category:Plateaus of Argentina