Abstract
The Cayman Trough in the Caribbean is a very small ocean basin (1000 km x 110 km) that is surrounded by older terranes, some of which are continental (Case et al., 1990). The spreading rate at the Mid-Cayman Rise is extremely slow (possibly 1.2 cm a -I for the last 5.5 Ma Rosencrantz et al., 1988). Magmas contributing to the basalts that form the Cayman Trough potent ia l ly formed f rom several sources, including non-asthenospheric ones. This region, therefore, provides an ideal area to investigate the processes that occur in magma chambers beneath ocean ridges as the magmas here potentially have the greatest ranges in isotopic ratios and tracedement patterns.
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