Reactive melt transport in the mantle and geochemical signatures of mantle-derived magmas

predicted effects, but more complete sample suites yielding detailedModeling of equilibrium reactive melt transport in the mantle, temporal–compositional variations of clearly cogenetic lavas areincluding the effects of mineralogic reactions and changes in porosity needed to test the petrogenetic significance of reactive melt transportin the solid matrix, provides a series of robust predictions of the on erupted magmas.consequences of reactive melt transport on magma trace element compositions. The composition of the leading melt batch through a column of reactive mantle (the melt front) will be shifted towards that of an incipient partial melt of the mantle matrix. Successive melt batches migrating through and emerging from the column will KEY WORDS: melt migration; trace elements; melt–mantle reactionshow a temporal–compositional trend reflecting exhaustion of the reactive capacity of the mantle, and will eventually return to the original input melt composition. In cases where the melt source and column matrix are similar in composition, the melt front will be INTRODUCTION ANDenriched in incompatible elements, and the temporal–compositional BACKGROUNDtrend will be one of decreasing incompatible elements in erupted melt batches with time. Cogenetic melt batches should show some Basaltic magmas provide some of the best constraints o