Discover and read the best of Twitter Threads about #subduction

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An #ophiolite is a rock with a secret: it tells the story of an ocean that lived and died.

Ophiolites are pieces of crust and mantle that formed at #spreadingcenters below an ocean. Why do we find these rocks (black dots) in mountain belts (red)? 🧵…
The #WilsonCycle describes how tectonic plates break apart, forming an ocean basin that grows around a spreading center. But the oceanic lithosphere is dense, and it eventually breaks and sink into the mantle. #Subduction closes the basin and the plates on either side collide.
Rocks that form at a #spreadingcenter have a distinctive sequence: sediments on top, then basalts that erupted underwater, then denser rocks crystallized from melted mantle, grading into mantle. You might find this sequence on land (an #ophiolite), but it formed under the ocean.
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Attention subducters! 12 part THREAD on our new @VoiLA_NERC paper in @Nature, led by @Cooper_geo. TL;DR? Not all #subduction zones recycle water the same way & #LesserAntilles recycling changes in time and space [1/12]
So how did the @VoiLA_NERC team, funded by @NERCScience, use boron isotopes to show that water subducted by the #Atlantic Plate is directly linked to volcanic and earthquake activity in the #Antilles? [2/12] Title and abstract of Cooper et al (2020) paper in Nature
@VoiLA_NERC is tracking #water right through the #Antilles subduction zone. We chose this site because it contrasts with the much better studied Pacific margins [3/12]… Block schematic diagram of Antilles subduction zone
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