Dissertation/Thesis Abstract

Paleomagnetic study of the Portage Lake Volcanics exposed in the Quincy Mine
by Michels, Alexander C., M.S., Michigan Technological University, 2013, 109; 1545593
Abstract (Summary)

A detailed paleomagnetic and rock-magnetic investigation was conducted on thirty six basaltic flows of the ∼1095 Ma Portage Lake Volcanics. The flows were sampled along the East Adit of the Quincy Mine (Hancock, MI). Thirty two flows yielded well-defined primary magnetization directions carried by magnetite. A secondary magnetization component carried by hematite was also found in twenty nine flows. After correction for serial correlation between the flows, nineteen independent mean directions were calculated. The corresponding paleomagnetic pole is located at 25.5 °N, 182.1 °W (A95 = 3.5°). The new pole overlaps with the pole from the ∼1087 Ma Lake Shore Traps suggesting a standstill of the North American plate during that time period. The low angular dispersion of virtual geomagnetic poles (S = 7.9°) suggests that the flows were erupted within a short time period, or that the strength of geomagnetic secular variation was lower than that of the recent field.

Indexing (document details)
Advisor: Smirnov, Aleksey
Commitee: Anderson, Kari, Levin, Eugene
School: Michigan Technological University
Department: Geological/Mining Engineering and Sciences
School Location: United States -- Michigan
Source: MAI 52/02M(E), Masters Abstracts International
Subjects: Geology, Geophysics
Keywords: Basalt, Midcontinent rift, Paleomagnetism, Portage Lake Volcanics, Quincy Mine, Michigan, Rock magnetism
Publication Number: 1545593
ISBN: 978-1-303-40894-6
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