EarthScope targets in the central Appalachians • Eastern US continental margin preserves the signature of several cycles of supercontinent assembly and breakup in the surface geology. • To what extent have deep structures in the crust and mantle lithosphere
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EarthScope targets in the central Appalachians Eastern US continental margin preserves the signature of several cycles of supercontinent assembly and breakup.
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EarthScope targets in the central Appalachians
• Eastern US continental margin preserves the signature of several cycles of supercontinent assembly and breakup in the surface geology.
• To what extent have deep structures in the crust and mantle lithosphere persisted over this timeframe?
• Why has Appalachian topography persisted over long time period?
EarthScope targets in the central Appalachians• Central Appalachian swath:• Sharp gradients in Moho depths,
perhaps corresponding with surface geologic structures (Benoit et al., in prep.). Possible magmatic underplating in lower crust?
• Lateral transition in shear wave splitting behavior
• Encompasses C. VA Seismic Zone (2011 Mineral, VA earthquake)
• Encompasses youngest known volcanic rocks in the eastern US (Eocene basalts in and around Harrisonburg, VA)