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The Melting Column as a Filter of Mantle Trace-Element Heterogeneity
Tong Bo1, Richard F Katz2, Oliver Shorttle3,4
1Department of Mechanics and Engineering Science Peking University Beijing China.
Geochemistry, Geophysics, Geosystems : G(3)
|April 23, 2019
Summary
Mantle trace-element variability is not solely due to source differences. Magma transport processes, not just initial mantle composition, significantly shape these variations.
Area of Science:
- Geochemistry
- Mantle Petrology
- Trace Element Analysis
Background:
- Trace-element concentrations in basaltic lavas and melt inclusions reveal mantle heterogeneity.
- Disentangling source heterogeneity from melt transport processes is a key challenge.
Purpose of the Study:
- To test the hypothesis that trace-element variability originates solely from mantle source heterogeneity.
- To model the filtering effect of a melting column on trace-element variability.
Main Methods:
- One-dimensional, steady-state melting column modeling.
- Analysis of trace-element variability attenuation based on heterogeneity wavelength, partition coefficients, melt productivity, and segregation efficiency.
Main Results:
- Melting columns act as filters, attenuating trace-element variability.
- Models fitting observations required assumptions contradicting magma assembly timescales.
- The end-member hypothesis of source heterogeneity alone is falsified.
Conclusions:
- Observed trace-element variability necessitates heterogeneity in melt transport processes.
- Melt transport heterogeneity likely involves channels or waves, interacting with source heterogeneity.
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