What is it about?
This work investigated the isotopic composition of gas like helium trapped in tiny vesicles in deep diamonds, coming from the mantle transition zone (~410-660 km below our feet) that separates the upper and the lower mantle. Results show that there is a signal from a primordial reservoir, dating from the formation of the Earth, residing in the deep mantle, which mix with the recycling of oceanic crust happening in the upper mantle.
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Why is it important?
This is the first direct proof of the existence of such primordial reservoir, unaffected by any contamination.
Perspectives
I was really glad to be part of this project that has been directed by Suzette Timmerman. This was a great opportunity to participate in a big-picture research project, and Suzette has made a great job at leading the project to an incredible end with great findings!
Dr Charles Le Losq
Universite Sorbonne Paris Cite
Read the Original
This page is a summary of: Primordial and recycled helium isotope signatures in the mantle transition zone, Science, August 2019, American Association for the Advancement of Science,
DOI: 10.1126/science.aax5293.
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