La Negrillar
Negrillar, La
火砕丘 · Chile · 4220m
- タイプ
- 火砕丘
- 国
- Chile
- 地域
- South America Volcanic Regions / Central Andean Volcanic Arc
- 標高
- 4220m
- 座標
- -24.319, -68.590
- 最終噴火
- 不明
- テクトニクス環境
- Subduction zone / Continental crust (> 25 km)
- 火山地形
- Minor
- 主要岩石
- Andesite / Basaltic Andesite
地質学的概要
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.
Wikipedia の要約
英語版の要約La 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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噴火履歴
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