Detrital Zircon Fission Track Analysis of the Baranof Schist of Whale Bay, Alaska
The Baranof Schist in southeastern Alaska is the metamorphosed region of the Sitka Graywacke of the Chugach-Prince William terrane. Samples of the Baranof Schist were collected from a transect of exposed rocks in Whale Bay on Baranof Island, Alaska. Previous detrital zircon fission track analyses have dated other samples from Baranof Island, with average ages of sedimentary rocks ranging from 72-105 m.y. (Haeussler et al., 2004). Adjacent to the exposed units of the Chugach-Prince William terrane is the Crawfish pluton, which through U-Pb dating is placed at 50.1 ± 0.1 m.y. (Cowan, 2003)
This project aims to date samples taken from Whale Bay using detrital zircon fission track analysis in order to better understand the cooling and uplift ages of these rocks. Deposition ages of the Sitka Graywacke and Baranof Schist are already known, but further investigation could lead to dates and processes of exhumation, as well as determine the effect proximity to a pluton has on the resetting of zircons in the samples.