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Geochemical consequences of melt transport in 2-D: The sensitivity of trace elements to mantle dynamics (1995)
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BibTeX
@MISC{Spiegelman95geochemicalconsequences,
author = {Marc Spiegelman},
title = {Geochemical consequences of melt transport in 2-D: The sensitivity of trace elements to mantle dynamics},
year = {1995}
}
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Abstract
Dynamic models are presented to investigate the consequences of melting and melt transport for stable trace element geochemistry in open systems. These models show that including explicit melt transport in 2-D adds non-trivial behaviour because melts and residues can travel and mix along very different trajectories. Calculations are presented for both equilibrium and disequilibrium transport and passive and active mid-ocean ridge flows. These calculations demonstrate that trace elements are sensitive to mantle dynamics and can readily distinguish between different end-member flow fields. Passive plate driven flow with strong melt focusing produces enrichments of incompatible elements. Active small-scale solid convection within the partially molten region, however, can lead to extreme dilution of incompatible elements suggesting that this form of convection may not be significant beneath normal ridges. These calculations provide additional predictions about acrossaxis trends of geochemi...
Keyphrases
trace element melt transport geochemical consequence incompatible element different trajectory active mid-ocean ridge flow explicit melt transport non-trivial behaviour active small-scale solid convection strong melt dynamic model stable trace element geochemistry significant beneath normal ridge passive plate different end-member flow field additional prediction open system extreme dilution acrossaxis trend molten region disequilibrium transport
