![]() It has been a bedrock tenet of geophysics that Earth's liquid outer core has always been the source of the dynamo that generates its magnetic field. The study is one of the latest developments in a paradigm shift that could change how Earth's history is understood. "We don't have a conceptual framework for understanding the planet's evolution. "Currently we have no grand unifying theory for how Earth evolved thermally," Stegman said. The National Science Foundation-funded research provides a "door-opening opportunity" to resolving inconsistencies in the narrative of the planet's early days. In a study appearing in the journal Earth and Planetary Science Letters, researchers Dave Stegman, Leah Ziegler and Nicolas Blanc provide new estimates of the thermodynamics of magnetic field generation in the liquid portion of early Earth's mantle, and show how long that field was available. New research lends credence to an unorthodox retelling of the story of early Earth that was first proposed by a geophysicist at the Scripps Institution of Oceanography in La Jolla, California. ![]()
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