The inclusion shown is a bit smaller than 1 µm – approximately one hundredth the size of the thickness of a human hair. (IMAGE)

University of Göttingen

The inclusion shown is a bit smaller than 1 µm – approximately one hundredth the size of the thickness of a human hair.

Caption

The larger image (left) is a close-up of one of the red garnet crystals on the eclogite. The microscope has zoomed in to this crystal to show a tiny coesite inclusion which proves a subduction depth of more than 90 km. The inclusion is a bit smaller than 1 µm – approximately one hundredth the size of the thickness of a human hair.

Credit

reproduced from Schönig, J., Ferrero, S., Gresky, K. et al. Geothermal gradient change during subduction recorded by ultrahigh-pressure eclogite. Nature Geoscience (2026). https://doi.org/10.1038/s41561-026-02110-1

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