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Nevado Tres Cruces : ウィキペディア英語版
Nevado Tres Cruces

Nevado Tres Cruces is a massif of volcanic origin in the Andes Mountains. It has two main summits, Tres Cruces Sur at 6,748 m and Tres Cruces Centro at 6,629 m and a third more minor summit, Tres Cruces Norte 6,206 m. Tres Cruces Sur is the sixth highest mountain in the Andes. The area was first surveyed in 1883 by Francisco San Román and the Nevado Tres Cruces National Park was established in 1994.〔
The volcano has an extended history of activity, going back at least 1.5 million years. A number of lava domes surround the complex and a number of craters lie on its summits. The main volcano is of rhyodacitic composition and has generated two major ignimbritic eruptions, one 1.5 million years ago and a second 67,000 years ago. The last eruption was 28,000 years ago but the volcano may still become active in the future.
== Climate and Glaciation ==
The area has a desert climate, with nighttime temperatures below freezing and precipitation less than 29±14 mm in the local summer that quickly sublimates away, resulting in a lack of surface runoff and a barren landscape. The mean annual temperature is -2±4 degrees Celsius. The area is persistently very windy.〔 The snowline altitude in the area is , higher than the Pleistocene altitude of . Small relic glaciers with surfaces of less than exist above with moraines visible above .〔 In 2000 a total ice surface of was reported on Tres Cruces.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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