Paleomagnetism of the Caldwell lavas, Eastern Townships, Québec.
Forty two oriented samples (97 specimens) were obtained from 17<br />sites in metavolcanic rocks from the Caldwell Group of the Appalachians<br />of Southern Québec (longitude: 71u00'-71"30' W, latitude: 46°00'-46"10'N).<br />Th...
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| Format: | Article |
| Language: | English |
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Istituto Nazionale di Geofisica e Vulcanologia (INGV)
1978-06-01
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| Series: | Annals of Geophysics |
| Online Access: | http://www.annalsofgeophysics.eu/index.php/annals/article/view/4749 |
| Summary: | Forty two oriented samples (97 specimens) were obtained from 17<br />sites in metavolcanic rocks from the Caldwell Group of the Appalachians<br />of Southern Québec (longitude: 71u00'-71"30' W, latitude: 46°00'-46"10'N).<br />These metavolcanics of Lower Cambrian age are massive or pillowed lavas<br />of andesitic and mainly basaltic composition metamorphosed to the<br />sub-greenschist facies. Magnetite and occasionally hematite are the frequent<br />magnetic memory carrier.<br />In order to obtain some pertinent information relative to the stability<br />of the remanent magnetization component, stepwise alternating field<br />demagnetization was conducted on 35% of the specimens and the others<br />were demagnetized at an optimum alternating field. After AF treatment,<br />the paleopole position of the tilted formation from 16 localities is 148°E,<br />43°N (dp=11.3°, dm = 22.4°). After omission of 3 localities for which<br />a95>30°, the new paleopole position obtained is 173°E, 26°N. This formation<br />of Early Cambrian age is characterized by a reversed polarity. |
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| ISSN: | 1593-5213 2037-416X |