Acamarachi
| Acamarachi | |
|---|---|
| Pili | |
Acamarachi viewed from the north
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| Highest point | |
| Elevation | 6,046 m (19,836 ft) |
| Prominence | 1,608 m (5,276 ft) |
| Listing | Ultra |
| Coordinates | 23°18′S 67°37′W / 23.300°S 67.617°WCoordinates: 23°18′S 67°37′W / 23.300°S 67.617°W |
| Geography | |
 Acamarachi
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| Location | Antofagasta Region, Chile |
| Parent range | Andes |
| Geology | |
| Mountain type | Stratovolcano |
| Last eruption | Unknown |
Acamarachi (also known as Pili) is a 6,046-metre (19,836 ft) high volcano in northern Chile. In this part of Chile, it is the highest volcano. Its name means "black moon". It is a volcano in the Central Volcanic Zone of the Andes, a zone of strong volcanic activity during the last million years. Old volcanoes in the area are well-preserved, due to the dry climate.
Acamarachi itself is a cone-shaped volcano with steep upper flanks and a lava dome on its northern side. While there is no indication of historical activity and the flank lava flows are old, some lava flows around the summit crater and a lava coulee north of Acamarachi on the saddle between Acamarachi and Colachi volcano may be postglacial in age. Acamarachi is formed by andesitic and dacitic rocks.
Acamarachi features an Inca mountain sanctuary on which several figurines have been found. One female figurine is made out of silver, a male one is made out of thorny oyster. Both of these figurines were found with miniature clothing.
The volcano is located in the Central Volcanic Zone, an area of volcanism in the Andes. Volcanism in this area is dependent on the subduction in the Peru-Chile Trench. 27 million years ago, in this area of the Andes large rhyolitic eruptions commenced and formed major ignimbrites, dramatically increasing 10 million years ago. At the same time starting in the Miocene, andesitic to dacitic eruptive activity has formed large stratovolcanoes. This activity in the late and Holocene has created the current volcanic arc.
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