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Osorno–Llanquihue Basin
Cuenca de Osorno-Llanquihue
SRTM map of the topography of the northern part of Osorno–Llanquihue Basin. The basin does largely correspond with the topographic low of the Chilean Central Valley.
Coordinates	40°42′44″S 73°06′33″W / 40.712124°S 73.109218°W / -40.712124; -73.109218
Etymology	Osorno and Llanquihue Lake
Location	Southwestern South America
Country	Chile
State(s)	Los Ríos Region Los Lagos Region
Characteristics
On/Offshore	Southern tip is offshore
Boundaries	Chilean Coast Range (W) Andes (E)
Hydrology
Sea(s)	Eastern Pacific Ocean
River(s)	Bueno, Negro, Pilmaiquén, Rahue, Damas
Lake(s)	Llanquihue, Laguna Las Ortigas and the westernmost portions of Rupanco, Puyehue and Ranco
Geology
Basin type	Forearc basin
Orogeny	Andean
Age	Oligocene-Pleistocene
Field(s)	Chilean coal

The Osorno–Llanquihue Basin (Spanish: Cuenca Osorno-Llanquihue) is a sedimentary basin located in south-central Chile in the forearc region of the Andes. From north to south the basin spans and area from Catamutún to Reloncaví Sound (40–42° S). The deepest part of the basin lie to the east. The lower levels of the basin are occupied by coal-bearing Cheuquemó Formation among other units while the Miocene-aged marine Santo Domingo Formation makes up much of the upper stratigraphy. The uppermost levels are made of sediments of Quaternary age of glacial, glaci-fluvial, glaci-lacustrine and volcanic character. The thickness of Quaternary sediments is greater to the south reaching almost 1,300 m (4,300 ft) in Puerto Montt. Sediments in the western part of the basin are roughly estimated to have reached 70 °C (158 °F) during burial and diagenesis.

References

1. Elgueta et al. 2000, p. 7.
2. ^ Elgueta et al. 2000, p. 10.
3. ^ Elgueta et al. 2000, pp. 13–14.
4. Kelm, Ursula; Cisternas, María E.; Helle, Sonia; Méndez, David (1994). "Diagenetic character of the Tertiary basin between Los Angeles and Osorno, southern Chile". Revista Geológica de Chile. 21 (2): 241–252. doi:10.5027/andgeoV21n2-a07.

Bibliography

• Elgueta, Sara; McDonough, Michael; Le Roux, Jacobus; Urqueta, Esteban & Duhart, Paul (2000), Estratigrafía y sedimentología de las cuencas Terciarias de la Región de Los Lagos (39-41°30'S) (in Spanish), Santiago, Chile: Servicio Nacional de Geología y Minería, ISSN 0020-3939

v t e Geology of Chile
Terranes	Arequipa-Antofalla Chaitenia Chilenia Chiloé Cuyania Fitz Roy Madre de Dios Mejillonia Patagonia
Sedimentary formations and groups	Cenozoic Neogene Abanico Fm. Angostura Fm. Ayacara Fm. Bahía Inglesa Fm. Caldera Beds Caleta Godoy Fm. Caleta Herradura Fm. Campanario Fm. Chaicayán Gp. Cheuquemó Fm. Cholchol Fm. Chucal Fm. Cola de Zorro Fm. Coquimbo Fm. Cura-Mallín Gp. Farellones Fm. La Cascada Fm. Lacui Fm. La Montaña Fm. La Portada Fm. Lauca Fm. Malleco Fm. Mininco Fm. Navidad Fm. Oxaya Fm. Parga Fm. Puduhuapi Fm. Pupunahue Beds Quebrada Macusa Fm. Ranquil Fm. Río Frías Fm. San Pedro Beds Santo Domingo Fm. Temuco Fm. Traiguén Fm. Trapa-Trapa Fm. Tubul Fm. Vargas Fm. Paleogene Abanico Fm. Azapa Fm. Caleta Chonos Fm. Cheuquemó Fm. Cura-Mallín Gp. La Cascada Fm. Lebu Gp. Loreto Fm. Lupica Fm. Oxaya Fm. Parga Fm. Purilactis Gp. Pupunahue Beds Temuco Fm. Vargas Fm. Mesozoic Cretaceous Baños del Flaco Fm. Cerro Colorado Fm. Chacarilla Fm. Chañarcillo Gp. Coihaique Gp. Divisadero Gp. Dorotea Fm. Hornitos Fm. La Liga Fm. Ñirehuao Fm. Punta del Cobre Fm. Purilactis Gp. Quiriquina Fm. Viñita Fm. Way Gp. Zapata Fm. Jurassic Chacarilla Fm. Coihaique Gp. Ibáñez Fm. La Liga Fm. La Negra Fm. Nacientes del Biobío Fm. Nacientes del Teno Fm. Pan de Azúcar Fm. Tobífera Fm. Triassic Canto del Agua Fm. Choiyoi Gp. Panguipulli Fm. Santa Juana Fm. Tralcán Fm. Paleozoic Llano de Chocolate Beds
Batholiths	Coastal central Chile Elqui-Limarí Futrono-Riñihue North Patagonian Panguipulli South Patagonian Vicuña Mackenna
Metamorphic complexes	Bahía Mansa Belén Chañaral Choapa Chonos Cordillera Darwin Eastern Andes Mejillones Puerto Edén Punta de Choros Quebrada del Carrizo Trafún Tierra del Fuego
Faults	Atacama Fault Biobío-Aluminé Fault Cachet Fault Domeyko Fault El Arrayán Fault Futrono Fault Gastre Fault Lanalhue Fault Liquiñe-Ofqui Fault Magallanes-Fagnano Fault Mocha-Villarrica Fault Pichilemu Fault Reigolil-Pirihueico Fault San Ramón Fault Valeriano Fault
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