Abstract
Temporal constraints on mid-ocean ridge basalt (MORB) magmatism both on and off-axis are critically needed to better understand problems associated with MORB petrogenesis and the processes of crustal accretion at the MOR. Using measurements of U-series disequilibria, radiogenic isotopes and majorand trace-element compositions in a suite of MORBs, from 9~176 East Pacific Rise (EPR), we are addressing two questions related to the temporal component of MORB magmatism: 1) How does magma storage time (i.e. the time after which the melt is no longer in equilibrium with its source) affect the degree of crystal fractionation of MORBs and what is the time-scale of this storage? 2) Is MOR magmatism focused at the ridge or is there a significant component of off-axis volcanism?
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