Volcanology Solid symbols are volcanic front lavas.
Open symbols are back-arc lavas, there is a mixture of mantle and subduction signatures.
I study the volcanoes of convergent plate margins, using volcanology, tectonics, petrology and geochemistry. My overwheming interest has been on Central America, specifically the regional geochemistry of the entire arc and back-arc region and how the chemistry is related to tectonics and geologic history. Recent Publications Carr, M. J., Feigenson, M. D., and Bennett, E. A., 1990. Incompatible element and isotopic evidence for tectonic control of source mixing and melt extraction along the Cental American arc. America, The Geology of North America , Volume H , Chapter 14.