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 ID: 803469
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Slide1
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?
Slide2EarthScope 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)
Slide3EarthScope targets in the central Appalachians
Mid-Atlantic Geophysical Integrative Collaboration (MAGIC):
FlexArray
deployment + geomorphology/geodynamics component