Shock conditions experienced by Haughton crystalline basement rocks: A combined raman spectroscopy and electron backscatter diffraction study of a sample from Anomaly Hill

Author
Walton, Erin L.
Timms, N. E.
Jurak, H. A. M.
Osinski, G. R.
Faculty Advisor
Date
2019
Keywords
meteorites , shock conditions , Anomaly Hill , Canada
Abstract (summary)
Haughton is a 23-million year old impact structure with an apparent crater diameter of 23-km, formed in mixed target rocks of the Canadian High Arctic on Devon Island [1]. At the time of impact, the target stratigraphy comprised 1880 meters of Lower Paleozoic sedimentary rocks unconformably overlying granulite-facies tonalitic and granitic gneisses of the Precambrian Canadian Shield. A location near the center of the structure, characterized by strong negative gravimetric and positive magnetic anomalies, has been coined “Anomaly Hill” [3]. Highly shocked lithic clasts resembling pumice are particularly abundant at this locale, including carbonate-rich and gneiss clasts [4, 5]. In this study, a hand specimen from Anomaly Hill was investigated using an array of advanced analytical techniques. The goal is to constrain shock conditions experienced by Haughton crystalline basement rocks and their post-shock evolution.
Publication Information
DOI
Notes
Presented on October 3, 2019 at the Large Meteorite Impacts and Planetary Evolution VI Conference held at the University of Brasília in Brasilia, Brazil.
Item Type
Presentation
Language
English
Rights
All Rights Reserved