Lastarria
Stratovolkan · Chile-Argentina · 5706 m
- Tipe
- Stratovolkan
- Negara
- Chile-Argentina
- Wilayah
- South America Volcanic Regions / Central Andean Volcanic Arc
- Ketinggian
- 5706 m
- Koordinat
- -25.168, -68.507
- Letusan terakhir
- Tidak diketahui
- Kondisi tektonik
- Subduction zone / Continental crust (> 25 km)
- Bentuk lahan
- Composite
- Batuan utama
- Andesite / Basaltic Andesite
Ringkasan geologi
The NNW-trending edifice of 5706-m-high Lastarria volcano along the Chile-Argentina border contains five nested summit craters. The youngest feature is a lava dome that overlaps the northern crater rim. The large andesitic-dacitic Negriales lava field on the western flanks was erupted from a single SW-flank vent. A large debris-avalanche deposit is found on the SE flank. Recent pyroclastic-flow deposits form an extensive apron below the northern flanks of the volcano. Although no historical eruptions have been recorded, the youthful morphology of deposits suggests activity during historical time. Persistent fumarolic activity occurs at the summit and NW flank, and sulfur flows have been produced by melting of extensive sulfur deposits in the summit region.
Ringkasan Wikipedia
Ringkasan InggrisLastarria is a 5,697 metres (18,691 ft) high stratovolcano that lies on the border between Chile and Argentina. It is remote, and the surroundings are uninhabited but can be reached through an unpaved road. The volcano is part of the Central Volcanic Zone, one of the four segments of the volcanic arc of the Andes. Over a thousand volcanoes—of which about 50 are active—lie in this over 1,500 kilometres (930 mi) long chain of volcanoes, which is generated by subduction of the Nazca Plate beneath the South American Plate.
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