Sierra de Ajusco-Chichinauhtzin
The Sierra del Ajusco-Chichinauhtzin, also known as Serranía del Ajusco or Sierra de Chichinauhtzin, is a Mexican mountain range located between Mexico City and the states of Morelos and Mexico. It makes up the southern part of the mountain necklace that surrounds Mexico City. It is made up of more than one hundred volcanic cones, among which are: Tláloc, Chichinauhtzin (3,430 metres, Xitle (3,100 metres, Cerro Pelado (3,600 metres and Cuauhtzin (3,510 metres. Its maximum height is at the Cruz del Marqués peak on the Ajusco volcano.
View of the summits of Ajusco
Trans-Mexican Volcanic Belt
The Trans-Mexican Volcanic Belt, also known as the Transvolcanic Belt and locally as the Sierra Nevada, is an active volcanic belt that covers central-southern Mexico. Several of its highest peaks have snow all year long, and during clear weather, they are visible to a large percentage of those who live on the many high plateaus from which these volcanoes rise.
Six Mexican Volcanoes Left to right Iztaccíhuatl, Popocatépetl, Matlalcueitl (Malinche), Nauhcampatépetl (Cofre de Perote, most distant), Citlaltépetl (Pico de Orizaba), Sierra Negra
Image: Eje Neovolcánico Mexico
Pico de Orizaba
Volcanic Evolution and changes in composition over time. 1) Early to Late Miocene the belt the Cocos and Rivera plate begin subduction beneath Central Mexico. 2) Late Miocene to Early Pliocene the slab tear begins to propagate West to East across the back northern area of the belt, allowing Asthenospheric heat in to generate the Mafic episode. 3)Latest Miocene - Early Pliocene was the onset of more silic volcanics generated by Flat Slab Subduction which pushed the belt further inland to the north.