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- T31A-0137: Simulation of 3D Magma Migration and Oceanic Curst Formation During Continental Rifting
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Board 0137‚ Hall EFG (Poster Hall)NOLA CC
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Chase Shyu, University of Texas at Austin (First Author, Presenting Author)
Luc Lavier, University of Texas at Austin
Magma migration during continental rifting is a first order fundamental scientific issue of continental break-up in magmatic context and rift transition to the onset of mid oceanic ridges. Understanding how melt migrates and builds crustal structures in this setting is critical to interpreting both geological records and geophysical observations. We use new 3D functionalities in DynEarthSol (DES) to simulate parameterized magma migration and crustal accretion processes. The model captures pressure- and temperature-dependent melt generation in the mantle and enables two-phase migration leading to both intrusive dike formation in the lithosphere and extrusive volcanic deposits at the surface. These processes are dynamically coupled with existing surface processes in DES, allowing the simulation of interbedded sediments and volcanic units on rifted margins. Our models reproduce characteristic features such as seaward-dipping reflectors (SDRs) observed in magma-rich passive margins. By dynamically varying melt production and transport parameters within the model, we demonstrate how progressive magmatic accretion facilitates the transition from continental thinning to oceanic crust formation. This framework allows direct comparison with geological and geophysical observations and provides a platform to explore the sensitivity of rifting outcomes to melt dynamics.
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