InterRidge 2022 06 webinar by Jérôme Dyment
InterRidge 2022 Webinar Series - Earth Science, Life Science and Our Future
-Title: Deciphering the ocean magmetic stripes: the signal and the recorder
-Lecturer: Jérôme Dyment (Senior Researcher, Université Paris Cité, Institut de physique du globe de Paris, CNRS)
-Day: 28th June, 2022
Marine magnetics have been essential in leading the geoscience community to adopt Plate Tectonics as the new paradigm of Earth Sciences in the 1960s. Despite their wide use to date, understand the structure and reconstruct the past evolution of ocean basins, marine magnetic anomalies still have the potential to tell us more about the recorded signal - the main geomagnetic field history of the last 160 Ma - and the recorder - the oceanic crust and possibly the uppermost mantle. We will revisit both aspects in the light of recent works in various tectonic contexts - mid-ocean ridges, oceanic basins, subduction zones and passive margins - to derive a consistent picture of the magnetic structure of the oceanic lithosphere at different steps of its evolution. We will show that mastering both aspects - the recorder and the signal - are essential to properly date the seafloor, with examples from Meso-America, and will insist on the importance of collecting new well-navigated magnetic profiles to supersede those acquired before satellite positioning and increase the resolution of plate reconstructions.
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