Osorno–Llanquihue_Basin
Osorno–Llanquihue Basin
Sedimentary basin in Chile
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).[1] The deepest part of the basin lie to the east.[2] 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.[2] The uppermost levels are made of sediments of Quaternary age of glacial, glaci-fluvial, glaci-lacustrine and volcanic character.[3] The thickness of Quaternary sediments is greater to the south reaching almost 1,300 m (4,300 ft) in Puerto Montt.[3] Sediments in the western part of the basin are roughly estimated to have reached 70 °C (158 °F) during burial and diagenesis.[4]
