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In this episode, we cover: •[00:00] Introduction. •[01:04] Geochemist Brad Peters tells us about the Marquesas Archipelago and why is it a place of interest for geologists. •[02:42] He recounts evidence suggesting that one component of the Marquesas lavas was recycled sediment from the early Earth. •[04:59] Peters walks us through the likely journey of this sediment from its origins to its eruption on the Marquesas Archipelago. •[06:24] He explains what this lava tells us about the tectonic processes that were active four billion years ago. •[07:43] Peters summarizes how this result is different than what we previously thought about the inception of plate tectonics. •[08:19] He talks about what the results mean for the story of the early Earth. •[09:13] He lists the caveats and limitations of the study. •[10:09] Conclusion.
Brad Peters Postdoctoral researcher ETH Zurich
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