Date of Completion
Timothy Byrne, Jean Crespi, William Ouimet
Field of Study
Master of Science
Structural analyses and fluid inclusion microthermometry were conducted within the blueschist facies, Yuli Belt in the Taiwan arc-continent collision in order to better understand the kinematics and pressure and temperature conditions associated with rapid exhumation (~10 km/myr) of high-pressure rocks. The most recent ductile deformation, observed as a penetrative fabric, S3, and relatively late, steeply dipping, mineral-filled, mode-I fractures, was characterized by vertical shortening, top-to-the southwest shear, and northeast-southwest extension. The late-stage veins record entrapment conditions ranging from 200°C to 450°C. To generalize, this structural and metamorphic history is interpreted to reflect the later stages of exhumation of the Yuli Belt as the plate motion changed and/or thicker and more buoyant continental crust was incorporated into the subduction zone 2-1 Ma.
Chojnacki, Michael, "Late-stage Deformation and Exhumation of a High-pressure Metamorphic Belt in an Active Arc-continent Collision, Taiwan" (2019). Master's Theses. 1462.