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Article: [sup.40]Ar/[sup.39]Ar age of the Jurassic North Mountain Basalt, southwestern Nova Scotia.
- Article from:
- Atlantic Geology
- Article date:
- March 1, 2003
- Author:
CopyrightCOPYRIGHT 2003 Atlantic Geoscience Society. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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ABSTRACT
Two whole-rock samples of the Jurassic North Mountain Basalt have been dated using the [sup.40]Ar/[sup.39]Ar method. A single sample of fresh, medium-grained, holocrystalline basalt from the lower flow unit of this thick (i.e., 400 m) sequence gave coincident plateau and isochron correlation ages of 201 [+ or -] 2.5 Ma, in agreement with a zircon U-Pb age of 202 [+ or -] 1 Ma for this same flow unit. This [sup.40]Ar/[sup.39]Ar age contrasts with earlier conventional K-Ar whole-rock ages of ca. 192 Ma for the North Mountain Basalt, which are similar to other K-Ar and Ar/Ar ages for correlative basalts of eastern North America. The second dated sample is a ...
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