Nature research paper: Earth’s evolving geodynamic regime recorded by titanium isotopes
Finally, whereas the fundamental causes for the acceleration in continental crust growth and crustal recycling between 3.5 and 2.7 Ga remain unclear, our new δTi data require a regime of mantle convection with limited mass transfer between the upper and lower mantle for a substantial part of Earth’s history.
The Archaean to Proterozoic samples from three locations were also studied, comprising: five approximately 3.8 Ga pillow-textured metabasalt/metagabbro samples , one approximately 3.8 Ga Amitsoq gneiss , eight approximately 3.4 Ga doleritic samples of the Ameralik dyke swarm and six approximately 2.0 Ga Kangâmiut dyke samples from Southwest Greenland, two approximately 3.48 Ga komatiite and four approximately 3.
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