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OF THE THESIS MELT INCLUSIONS FROM VOLCAN DE COLIMA, MEXICO: COMPLEX EXAMPLES OF MAGMATIC DIFFERENTIATION by Zachary D. Atlas Florida International University, 2001 Miami, Florida Professor Gautam Sen, Major Professor Melt inclusions are minute magma bodies trapped within growing crystals. Their chemical compositions are useful in deciphering pre-eruptive conditions and magma evolution. The present study examined melt inclusions trapped in phenocrysts from the 3 rd and 4th magmatic cycles (1869-1988) at Volcdn de Colima, Mexico. Melt inclusions have highly evolved chemical compositions: 65-77% SiO 2, >12% A12O 3, 3-6% Na 2O and K2 0 and less than 5.5% Fe and Mg. Major element compositions suggest that they are strongly differentiated magmas controlled by fractionation of plagioclase, opx, cpx and hornblende. Water concentrations were measured to be 2.7-3.5 wt. % in cpx hosted inclusions and 0.3-0.7 wt % in opx and plagioclase. Trace element compositions are anomalously low and inversely correlate with water. From this we deduce that Colima lavas and scorias simultaneously differentiate and degas. Moreover, hornblende rim growth rates constrain the ascent of the Colima magmas to -100 days for passive eruptions and >4 days for plinian eruptions.

Melt inclusions from volcan de Colima, Mexico: complex examples of magmatic differentiation