Tata Sabaya
Bolivia · Americas
關於
Tata Sabaya is a 5,430-metre (17,810 ft) high volcano in Bolivia. It is part of the Central Volcanic Zone, one of several volcanic belts in the Andes which are separated by gaps without volcanic activity. This section of the Andes was volcanically active since the Jurassic, with an episode of strong ignimbritic volcanism occurring during the Miocene. Tata Sabaya lies in a thinly populated region north of the Salar de Coipasa salt pan.
Volcanic activity at Tata Sabaya and elsewhere in the Central Volcanic Zone is the consequence of the subduction of the Nazca Plate beneath the South America Plate. The volcano has developed along a lineament that separates older crust north of the lineament from younger crust in the south, and the edifice has been formed by andesitic rocks.
The southern flank of Tata Sabaya failed during the latest Pleistocene about 12,000–12,360 years before present. Debris from the collapse entered a lake that covered the Salar de Coipasa at that time and formed a deposit with a volume of 6 ± 1 cubic kilometre (1.44 ± 0.24 cu mi). Subsequently, the collapse scar was partly filled in with more recent lava flows and lava domes; one eruption occurred about 6,000 years before present.
內容改寫自 Wikipedia (CC BY-SA)。照片來自 Wikimedia Commons.