Migration, Storage and Seismic Signatures of Melting at the Lithosphere-Asthenosphere Boundary
Abstract
In this work we investigate the role of past and current episodes of partial melting at the Lithosphere-Asthenosphere Boundary (LAB) by combining geodynamic models of two-phase magma flow with a rock physics-based toolbox MuMaP (Multiphase Material Properties). The two-phase magma/mantle, time-dependent flow is modeled by conservational laws of fluid and solid matrix. Resulting coupled Stokes equations and Darcy's law are solved using finite-element method for a geologically relevant time, thus predicts the melt evolution within the upper mantle in terms of porosity distribution in 3-D space. Then we implement MuMap to forward calculate and visualize the seismic velocities of the two-phase mixture, resulting from variations in temperature, bulk composition and melt/frozen-in melt distribution. By exploring a broad parameter space, our work provides a framework to model and identify the most likely causes of the seismic anomalies at LAB and within the Lithosphere.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2015
- Bibcode:
- 2015AGUFMDI11B2591C
- Keywords:
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- 1038 Mantle processes;
- GEOCHEMISTRY;
- 7218 Lithosphere;
- SEISMOLOGY;
- 8120 Dynamics of lithosphere and mantle: general;
- TECTONOPHYSICS;
- 8124 Earth's interior: composition and state;
- TECTONOPHYSICS