Physical Sciences and Mathematics Commons^™

Melt Inclusions From Volcan De Colima, Mexico: Complex Examples Of Magmatic Differentiation, Zachary D. Atlas

FIU Electronic Theses and Dissertations

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 4^th magmatic cycles (1869-1988) at Volcan de Colima, Mexico. Melt inclusions have highly evolved chemical compositions: 65-77% SiO₂, >12% A1₂O₃, 3-6% Na₂O and K₂0 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 …

Geochemical Variation Among Small Eruptive Centers In The Central Svz Of The Andes : An Evaluation Of Subduction, Mantle And Crustal Influences, Murong Sun

FIU Electronic Theses and Dissertations

Subduction zone magmatism is an important and extensively studied topic in igneous geochemistry. Recent studies focus on from where arc magmas are generated, how subduction components (fluids or melts) are fluxed into the source of the magmas, and whether or how the subduction components affect partial melting processes beneath volcanic arcs at convergent boundaries.

At 39.5°S in the Central Southern Volcanic Zone of the Andes, Volcano Villarrica is surrounded by a suite of Small Eruptive Centers (SEC). The SECs are located mostly to the east and northeast of the stratovolcano and aligned along the Liquine - Ofqui Fault …