MORB-normalized Spider diagrams
IA: decoupled HFS - LIL (LIL are hydrophilic)
What is it about subduction zone setting that
causes fluid-assisted enrichment?
Figure 14.3. Winter (2001) An Introduction to Igneous and
Metamorphic Petrology. Prentice Hall.
Ocean-ocean Island Arc (IA)
Ocean-continent Continental Arc or
Active Continental Margin (ACM)
Figure 16.1. Principal subduction zones associated with orogenic volcanism and plutonism. Triangles are on the overriding
plate. PBS = Papuan
Ocean Intraplate Volcanism
Ocean islands and seamounts
Figure 14.1. Map of relatively well-established hotspots and selected hotspot trails (island chains or aseismic ridges).
Hotspots and trails from Crough (1983) with selected more recent hotspots from