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Comondu-La Purisima

火山原 · Mexico · 780m

A young scoria cone rises above cactus-covered terrain NE of the town of La Purísima. The Comondú-La Purísima volcanic field, located in southern Baja California, west of the Sierra de la Giganta, has been active from the Miocene to the Quaternary. The youngest lava flows are mostly located in the area between the Comondú and La Purísima rivers.
A young scoria cone rises above cactus-covered terrain NE of the town of La Purísima. The Comondú-La Purísima volcanic field, located in southern Baja California, west of the Sierra de la Giganta, has been active from the Miocene to the Quaternary. The youngest lava flows are mostly located in the area between the Comondú and La Purísima rivers. · 写真: Photo by Brian Hausback, 1983 (California State University, Sacramento).
タイプ
火山原
国
Mexico
地域
Eastern Pacific Volcanic Regions / Gulf of California Rift Volcanic Province
標高
780m
座標
26.000, -111.920
最終噴火
不明
テクトニクス環境
Rift zone / Continental crust (> 25 km)
火山地形
Cluster
主要岩石
Trachyandesite / Basaltic Trachyandesite
地質学的概要

The Comondú-La Purísima volcanic field, located in southern Baja California, west of the Sierra de la Giganta, dates back to the Miocene. However, the youthful morphology of some cinder cones suggested possible Holocene ages (Sawlan, 1991). The youngest lavas form blocky flows with flow ridges and are mostly located in the area between Comondú and the La Purísima river. Vents usually occur along NNW-trending faults, and many lava flows are offset, sometimes repeatedly, along grabens. Both basaltic and andesitic lava flows are present. The former are typically 5-10 m thick, and the latter are up to 60-80 m thick and form dense, glassy flows with subhorizontal fractures.

噴火履歴

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