BackgroundThe volcano was built on folded volcaniclastic strata of the Cura-Mallín Formation (Eocene to Early Miocene), which is intruded by Miocene plutons, and uncomformably covered by basaltic to basaltic andesitic lavas and breccias of the Late Pliocene-Pleistocene Cola de Zorro Formation.
The Lomas Limpias unit are debris flow deposits from a major sector collapse depression on the eastern flank of the volcano, which happened less than 10,000 years ago. The deposits covers an area of 2 square km. The scar on the eastern side is partially covered with younger lava flows and tephra.
Eruptions at Nevado de Longavi Volcano
No historical eruptions are known from the volcano, but most eruptions over the past 10,000 years were explosive. Their deposits partly fill the Lomas Limpias sector-collapse depression on the east flank at the headwaters of Río Blanco. Most young activity occurred from the summit and eastern flank.
The most recent eruption was the formation of a dacitic dome in the summit area and upper part of the collapse scar. Block and ash deposits from partial come collapse are found to the east and comprise an estimated volume of 0.12 km3.
Two magmatic series are present at Longaví volcano indicating that the mechanisms of magma generation have been variable over time.
Daniel Fernando SELLÉS MATHIEU (2006) "Stratigraphy, Petrology, and Geochemistry of Nevado de Longaví Volcano, Chilean Andes (36.2°S)." University of Geneva, PhD thesis n° 3752
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