Paleomagnetism of the Caldwell lavas, Eastern Townships, Québec.
Main Article Content
Abstract
Forty two oriented samples (97 specimens) were obtained from 17
sites in metavolcanic rocks from the Caldwell Group of the Appalachians
of Southern Québec (longitude: 71u00'-71"30' W, latitude: 46°00'-46"10'N).
These metavolcanics of Lower Cambrian age are massive or pillowed lavas
of andesitic and mainly basaltic composition metamorphosed to the
sub-greenschist facies. Magnetite and occasionally hematite are the frequent
magnetic memory carrier.
In order to obtain some pertinent information relative to the stability
of the remanent magnetization component, stepwise alternating field
demagnetization was conducted on 35% of the specimens and the others
were demagnetized at an optimum alternating field. After AF treatment,
the paleopole position of the tilted formation from 16 localities is 148°E,
43°N (dp=11.3°, dm = 22.4°). After omission of 3 localities for which
a95>30°, the new paleopole position obtained is 173°E, 26°N. This formation
of Early Cambrian age is characterized by a reversed polarity.
sites in metavolcanic rocks from the Caldwell Group of the Appalachians
of Southern Québec (longitude: 71u00'-71"30' W, latitude: 46°00'-46"10'N).
These metavolcanics of Lower Cambrian age are massive or pillowed lavas
of andesitic and mainly basaltic composition metamorphosed to the
sub-greenschist facies. Magnetite and occasionally hematite are the frequent
magnetic memory carrier.
In order to obtain some pertinent information relative to the stability
of the remanent magnetization component, stepwise alternating field
demagnetization was conducted on 35% of the specimens and the others
were demagnetized at an optimum alternating field. After AF treatment,
the paleopole position of the tilted formation from 16 localities is 148°E,
43°N (dp=11.3°, dm = 22.4°). After omission of 3 localities for which
a95>30°, the new paleopole position obtained is 173°E, 26°N. This formation
of Early Cambrian age is characterized by a reversed polarity.
Article Details
How to Cite
SEGUIN, M. K. (1978) “ Québec”., Annals of Geophysics, 31(1), pp. 197–208. doi: 10.4401/ag-4749.
Issue
Section
OLD
Open-Access License
No Permission Required
Istituto Nazionale di Geofisica e Vulcanologia applies the Creative Commons Attribution License (CCAL) to all works we publish.
Under the CCAL, authors retain ownership of the copyright for their article, but authors allow anyone to download, reuse, reprint, modify, distribute, so long as the original authors and source are cited. No permission is required from the authors or the publishers.
In most cases, appropriate attribution can be provided by simply citing the original article.
If the item you plan to reuse is not part of a published article (e.g., a featured issue image), then please indicate the originator of the work, and the volume, issue, and date of the journal in which the item appeared. For any reuse or redistribution of a work, you must also make clear the license terms under which the work was published.
This broad license was developed to facilitate open access to, and free use of, original works of all types. Applying this standard license to your own work will ensure your right to make your work freely and openly available. For queries about the license, please contact ann.geophys@ingv.it.