Tectonomagmatic origin of igneous rocks from the western Mexican Volcanic Belt

Abstract

The origin of magmas in the western part of the Mexican Volcanic Belt (W-MVB) was constrained from tectonomagmatic discrimination diagrams under the assumption that the magmas originated from different tectonic settings are distinguishable from differences in their chemical compositions.For the W-MVB, the diagrams for basic rocks generally indicate a continental rift setting whereas those for intermediate and acid rocks show either an arc or a transitional arc to rift setting but with relatively low total percent probability values.Besides these diagrams, the conventional significance tests (Fisher F, Student t, and ANOVA) were also applied to understand the complex petrogenetic and tectonic processes in the W-MVB.