La Negrillar
Negrillar, La
Cono piroclastico · Chile · 4220 m
- Tipo
- Cono piroclastico
- Paese
- Chile
- Regione
- South America Volcanic Regions / Central Andean Volcanic Arc
- Altitudine
- 4220 m
- Coordinate
- -24.319, -68.590
- Ultima eruzione
- Sconosciuto
- Contesto tettonico
- Subduction zone / Continental crust (> 25 km)
- Forma vulcanica
- Minor
- Roccia principale
- Andesite / Basaltic Andesite
Sintesi geologica
The basaltic andesite La Negrillar cone and lava flow complex (also known as Aguas Perdidas) covers a roughly 50 km2 area along the SW margin of the Atacama basin about 35 km WNW of Socompa volcano between the small Sierra San Juan and Sierra Almeida ranges. It was interpreted to be Holocene by de Silva and Francis (1991), though Gardeweg (1993, pers. comm.) did not consider it to be of Holocene age. Additionally, de Silva (2007, pers. comm.) noted that it was not as youthful looking as the El Negrillar complex to the N, although it did show leveed lava flows and pristine craters.
Sintesi da Wikipedia
Riassunto in ingleseLa Negrillar is a volcanic cone and associated lava flow in Chile. It covers 16 square kilometres (6.2 sq mi) on the southwestern margin of the Atacama basin. It erupted basalts and andesite and its flows and cones are well preserved. Radiometric dating has yielded ages of 1.4 ± 0.5 and 0.54 ± 0.5 million years. It is one of several mafic centres in the region located along fault systems.
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