By: magic-gigapans
Image: Callan Bentley, Mid-Atlantic Geo-Image Collection
License: Creative Commons Non Commercial ⧉

Uploaded: 22 Apr 2020
Last Updated: 21 Sep 2020

703 megapixels
38,292 x 18,364 pixels
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Blueschist bearing porphyroblasts of the amphibole glaucophane, the mineral that gives blueschist its blue color. Sample was collected in Turkey's Tavşanlı Zone, a subduction zone complex that formed as the Tethys Ocean closed. These rocks were dunked to around 80 km depth (precipitating the metamorphic reaction that made the glaucophane) before being exhumed to the surface. Maximum width of sample is about 20 cm.