19 Structural Geology and Tectonics (Posters)

A METHOD OF PRODUCING ACCURATELY ORIENTED THIN-SECTIONS, BASED ON AMS, APPLIED TO THE MULTIPLE FABRICS OF THE DIANA SYENITE, NORTHWEST ADIRONDACKS

Paper number: 19-11
Program: Technical Sessions
Time: 8:30 AM – 12:00 PM

Authors

Abstract

Accurately oriented thin-sections allow detailed analysis of rock fabric features that cannot be studied as accurately by other means. Using a custom built jig, standard 2.2 cm by 2.5 cm diameter rock cores can be made into oriented thin-sections quickly and accurately. AMS (anisotropy of magnetic susceptibility) of each core is used to accurately mark the orientation of the cuts to be made. A cut parallel to the great circle containing Kmax and Kint shows any lineation within that foliation. A cut perpendicular to the intersection of two foliations reveals the relationships (relative age, mineralogy, etc.) between the two foliations. This method is applied to the Diana Syenite within the Carthage-Colton Mylonite Zone in the Northwest Adirondacks where there are multiple generations of fabrics. The relative ages and possible movement on these features is being investigated.