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yesterday

Northern Appalachian Heat Anomaly Linked to Ancient Labrador Sea Rift

The study confirms that a slow mantle wave stemming from the Labrador Sea rift has carried the anomaly inland, forecasting its arrival beneath New York in about 10 to 15 million years.

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Overview

  • The new Geology paper uses seismic tomography and geodynamic simulations to trace the Northern Appalachian Anomaly to rifting between Greenland and North America 90–80 million years ago.
  • The anomaly extends roughly 350 kilometers across and lies about 200 kilometers beneath the Appalachian Mountains in New England.
  • Researchers validate a “mantle wave” mechanism in which convective drips transport hot mantle material inland at approximately 20 kilometers per million years.
  • A corresponding thermal anomaly beneath north-central Greenland is identified as the mirror-image counterpart formed on the opposite flank of the Labrador Sea rift.
  • Geodynamic models project the anomaly’s continued southwestward migration will pass under the New York region within the next 10 to 15 million years.