T39 Reading Igneous Textures (Posters)

Sunday, 22 September 2019
9:00 AM - 5:30 PM
Hall AB, North Building

OLD AND DEER: A STUDY OF PERIDOTITES IN MICHIGAN’S UPPER PENINSULA

Paper number: T39-7
Program: Technical Sessions
Time: 9:00 AM – 5:30 PM

Authors

Abstract

The Deer Lake Peridotite and the Presque Isle Black Rocks are two ultramafic formations of Neoarchean age within the Ishpeming Greenstone Belt of Michigan’s Upper Peninsula, and are found only fifteen miles apart. The Deer Lake Peridotite was deformed in processes indicative of the broader, regional-scale tectonics of the region, but little study has been done on the mineralogy and extent and style of alteration. This research aims to better classify the mineralogy of the formation, with particular focus on textural variations observed in thin section, as well as chemical analysis of samples taken from the formation. In addition, this research seeks to correlate the Deer Lake Peridotite’s history of alteration, which may have included alteration by Proterozoic events, with that of the Presque Isle Black Rocks, a formation which has had more extensive study done on its tectonic history and alteration. The comparison between alteration styles in the two formations will help draw conclusions about the tectonic history of Michigan’s Upper Peninsula.

Geological Society of America Abstracts with Programs. Vol. 51, No. 5

doi: 10.1130/abs/2019AM-337853

© Copyright 2019 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions.