U-051 - Ultramafics in the Field
PI: Dr. Jessica Warren
Project Lead: Jessica Warren
Funding Source: NSF-EAR 1255620
Location: California and Oregon
Dates: 2014-09-04 to 2014-09-09
Project Summary
The goal of this project is to investigate the relationship between shear localization, melt flow and water content in the mantle, while simultaneously exposing students to advanced field and laboratory techniques. The field component of this project will involve a TLS study in the Josephine Peridotite in Oregon, to be conducted over two field seasons (in 2013 and 2015). The study will be part of a field class that Professor Warren teaches on advanced field methods to undergraduate and graduate students at Stanford. Analysis of the dataset will form part of the PhD thesis of one of Warren’s students. The area of focus for the TLS study will be a section of the Josephine Peridotite known as Fresno Bench. This is an exposure of mantle peridotite <1 km wide, which has minimal vegetation following the 2002 Biscuit Fire. Fresno Bench contains small-scale shear zones that range in width from 1 m to 60 m and contain syn-deformational melt channels. At this scale, existing topographic maps do not provide the resolution necessary to study spatial relationships in any detail. Collection of a geo-referenced point cloud, along with structural field data, will allow us to reconstruct the 3-dimensional relationship between deformation and melt flow in the mantle. This will represent a novel application of TLS. (From PSR)