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Paleomagnetism of the Caldwell lavas, Eastern Townships, Québec.

Author(s): M. K. SEGUIN

Journal: Annals of Geophysics
ISSN 1593-5213

Volume: 31;
Issue: 1;
Start page: 197;
Date: 2010;
Original page

Forty two oriented samples (97 specimens) were obtained from 17sites in metavolcanic rocks from the Caldwell Group of the Appalachiansof Southern Québec (longitude: 71u00'-71"30' W, latitude: 46°00'-46"10'N).These metavolcanics of Lower Cambrian age are massive or pillowed lavasof andesitic and mainly basaltic composition metamorphosed to thesub-greenschist facies. Magnetite and occasionally hematite are the frequentmagnetic memory carrier.In order to obtain some pertinent information relative to the stabilityof the remanent magnetization component, stepwise alternating fielddemagnetization was conducted on 35% of the specimens and the otherswere 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 whicha95>30°, the new paleopole position obtained is 173°E, 26°N. This formationof Early Cambrian age is characterized by a reversed polarity.

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