The ca. 2 Ga retrogressed eclogites in the Usagaran Belt central Tanzania are among oldest documented world. As such, they have been used to pinpoint thermal conditions of onset modern style subduction on Earth. Two samples mafic eclogite interrogated reconstruct metamorphic history subducted crust. several kilometres apart, separated by a mylonitic upper amphibolite-transitional granulite foli...

Metamorphic core complexes in the western North American Cordillera are commonly interpreted as result of a single phase large-magnitude extension during middle to late Cenozoic. We present evidence that mylonitic shear zones Harcuvar and Buckskin-Rawhide west-central Arizona also accommodated an earlier Late Cretaceous early Paleocene. Microstructural data indicate substantial top-NE mylonitiz...

The Lyagkomina occurrence of kyanite amphibolites (the Belomorian Province the Fennoscandian Shield) is confined to an amphibolite boudin among kyanite-garnet-biotite and garnet-biotite gneisses Chupa Sequence. main rock types at are meso- melanocratic garnet-kyanite with large (more than 1 cm in length) kyanite-garnet small kyanite. There also leucocratic garnet-biotite-amphibole-plagioclase r...