Magmatic geoidentity of the Rio Grande Rift Province in Chihuahua, Mexico
DOI:
https://doi.org/10.36790/epistemus.v18i36.352Keywords:
Silica Volcanism , Rio Grande Rift , Western Sierra Madre, Hyperalkaline rhyolitesAbstract
The western Mexican margin has been characterized by the episodic installation of subduction systems, such as in the late Cretaceous-Cenozoic time. These systems gave place to mainly intermediate to acidic volcanic activity in NW Mexico (e.g., the Sierra Madre Occidental ignimbrite province). However, the analysis of a geochemical database (major and trace elements) for felsic volcanism (adjusted SiO2, x ≥ 62%) exposed in the state of Chihuahua during the late Eocene-Oligocene period has revealed the existence of lithologies with an affinity to extensional environments that account for the largest percentage (68 %) of the obtained samples in this database. This volcanism could represent a continuation of the activity associated with the Rio Grande rift of the SW in the USA.
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