Physical and Chemical Variations Along the Central American Volcanic Arc
Summary 
The Central American volcanic arc displays large arc-parallel variations in chemical composition that yield important clues concerning the complex origin of magmas in subduction zones. In this exercise, students use data compiled for the NSF MARGINS program to compare heights, volumes, and whole-rock compositions of 39 Quaternary volcanic centers along the Central American arc, together with crustal thicknesses, to assess the possible sources of the magmas and the petrologic processes that have modified them prior to eruption.
Learning Goals
make and test hypotheses linking variables such as magma composition, crustal thickness, volcano height, and sediment subduction
Context for Use
This activity can be used as a supplementary exercise to complement lectures on subduction zone magmatism in an undergraduate- or graduate-level petrology course. It may be completed in or out of class.
Description and Teaching Materials
This is an online exercise which is part of the "Integrating Research and Education" project at SERC. The development version of the exercise can be found at http://serc.carleton.edu/research_education/cyberinfrastructure/centam/index.html
It is currently under development.
It is currently under development.
Teaching Notes and Tips
Assessment
Students are presented with a series of questions to answer during this exercise. It is up to the instructor how the students' data might be evaluated. This exercise might to used to form the basis for an open-ended group discussion.
References and Resources
http://serc.carleton.edu/research_education/cyberinfrastructure/centam/index.html
