Pseudotachylyte in the Tananao Metamorphic Complex, Taiwan: Occurrence and dynamic phase changes of fossil earthquakes

►Pseudotachylytes were first reported from the metamorphic basement of Taiwan. ►Field and OM/SEM/TEM showed partial melting of a biotite-dominated assemblage. ►Identification of late-stage K-rich fluid and jarosites with Fe-rich amorphous shells. ►New finding of carbon in Fe-rich pseudotachylyte and the black vein chlorite + C.