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The Quimsachata (Kimsachata) volcano group, the northernmost young volcanoes in Peru, consist of two late-Pleistocene and Holocene monogenetic volcanoes lie at the foot of the Cordillera Oriental in an isolated area far east of the main volcanic front. Quimsachata is a high-potassium andesitic scoria cone surrounded by a compound lava shield that was erupted in flat terrain along the Vilcanota River about 11,500 years ago. Oroscocha is a rhyolitic lava dome with a short, thick lava flow erupted from a N-S-trending fissure about 6400 years ago.
Summary of Holocene eruption dates and Volcanic Explosivity Indices (VEI).
|Start Date||Stop Date||Eruption Certainty||VEI||Evidence||Activity Area or Unit|
|4450 BCE (?)||Unknown||Confirmed||Radiocarbon (uncorrected)||Oroscocha|
|Feature Name||Feature Type||Elevation||Latitude||Longitude|
|The dark-colored lava flow just to the right and below the center of this NASA Landsat image (with north to the top) originated from the Quimsachata (Kimsachata) scoria cone about 11,500 years ago. The smaller lava flow directly to the north that deflects the E-W-trending Vilcanota River was erupted from the Oroscocha lava dome about 6400 years ago. These are the northernmost young volcanic centers in Perú and lie at the foot of the Cordillera Oriental in an isolated area far east of the main volcanic front.
NASA Landsat7 image (worldwind.arc.nasa.gov)
Gonzalez-Ferran O, 1995. Volcanes de Chile. Santiago: Instituto Geografico Militar, 635 p.
IAVCEI, 1973-80. Post-Miocene Volcanoes of the World. IAVCEI Data Sheets, Rome: Internatl Assoc Volc Chemistry Earth's Interior..
Parodi-I A, 1975. Volcanes del Peru. Soc Geog Lima Bull, 94: 20-23.
Siebe C, Schaaf P, Carlotto V, Gomez J C, 2006. Radiocarbon ages and composition of Holocene-Late Pleistocene monogenetic Kimsachata and Oroscocha volcanoes in Cusco, Peru. Cities on Volcanoes 4, Quito, Ecuador, 23-27 Jan, 2006, Abs, p 73.