A paleomagnetic study of the concretions of the Huron Shale
Loading...
Date
1976-12
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
The Ohio State University
Abstract
Samples from the Huron Shale (U. Devonian - Ohio) concretions are measured for remanent magnetism and anistropy of magnetic susceptibility. Two magnetic components are found, a "soft" viscous component, and a "hard" post-depositional component carried by fine grained magnetite. The post-depositional stable remanence is perturbed by concretion growth which must therefore also be post-depositional. Growth of elongate pyrite crystals is noted in the concretions and in other pyrite bearing limestones, which may be related to the observed large deviation between the stable magnetic remanence of the concretions and the North American VGP for the Upper Devonian.