The Cinder Cones of Michoac n-Guanajuato, Central Mexico: Petrology and Chemistry

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Abstract
The Michoách-Guanajuato Volcanic Field (MGVF) of central Mexico contains 900 cinder and lava coes but lacks the large active composite volcanoes found in other portions of the Mexican Volcanic Belt (MVB). Scoriae and lavas from these cinder cones are primarily olivine-basalts and olivine-andesites containing phenocrysts of olivine (plus Cr-rich spinel inclusions), plagioclase, and, less frequently, augite; pyroxene- and hornblende-andesites are subordinate. Most samples are calcalkaline; however, alkaline and transitional rocks are also found. Compositional variation at individual cones is usually less than 5 per cent SiO2 and at Volcán Paricutin (1943–1952) and Volcán Jorullo (1759–1774), lava compositions have become more silica-rich with time.

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