Date of Completion

12-15-2019

Embargo Period

5-25-2020

Advisors

Timothy Byrne, Jean Crespi, William Ouimet

Field of Study

Geological Sciences

Degree

Master of Science

Open Access

Open Access

Abstract

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.

Major Advisor

Timothy Byrne

Available for download on Monday, May 25, 2020

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