https://www.sciencenews.org/article/ancient-zircon-plate-tectonics-subduction-earth
Ancient zircons may record the dawn of plate tectonics
May 2, 2022 - A change in gemstone composition starting about 3.8 billion years ago may offer the earliest record of one tectonic plate sliding over another.
the dawnplate tectonicsancientzirconsmay
https://openresearch-repository.anu.edu.au/items/85a8cd1e-25c2-4c24-a03d-aabb38a8fd6e
Extinct 244 Pu in Ancient Zircons
We have found evidence, in the form of fissiogenic xenon isotopes, for in situ decay of 244Pu in individual 4.1- to 4.2-billion-year-old zircons from the Jack...
extinctpuancientzircons