El Rojo Sur
Lua error in Module:Coordinates at line 489: attempt to index field 'wikibase' (a nil value). El Rojo Sur is a monogenetic volcano in the Andes,[1] in the form of a cone.[2]
It is similar to El Rojo Norte 260 kilometres (160 mi) farther north.[1] A mafic andesite lava flow was erupted from the 100 metres (330 ft) high cone that also features red scoria. Ages obtained by potassium-argon dating are 2.93±0.13, 3.4±0.4 and 3.23±0.12 mya.[3]
Rojo Sur erupted undifferentiated mafic magmas. Its lead isotope composition is different from the composition of that segment of the Andes, being non-radiogenic. This isotope signature may be the effect of assimilation of deeper basement rocks during magma formation.[2] In addition, the magmas are rich in incompatible elements.[4]
References
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