El Rojo Sur

20°50′S 68°37′W / 20.833°S 68.617°W / -20.833; -68.617^[1] 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]

^ ^a ^b ^c Cite error: The named reference Wigger1994 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference WornerMoorbath1992 was invoked but never defined (see the help page).
^ Cite error: The named reference WornerHammerschmidt2000 was invoked but never defined (see the help page).
^ Cite error: The named reference WornerEscobar1992 was invoked but never defined (see the help page).

[Wigger1994-1] Cite error: The named reference Wigger1994 was invoked but never defined (see the help page).

[WornerMoorbath1992-2] Cite error: The named reference WornerMoorbath1992 was invoked but never defined (see the help page).

[WornerHammerschmidt2000-3] Cite error: The named reference WornerHammerschmidt2000 was invoked but never defined (see the help page).

[WornerEscobar1992-4] Cite error: The named reference WornerEscobar1992 was invoked but never defined (see the help page).

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