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Lithosphere interprets earth
Date:9/20/2013

eveal systematic post-emplacement tilting. Plutons in the central structural domain yield a consistently oriented paleomagnetic remanence presumably acquired as the Late Cretaceous arc cooled from approx. 110 to 85 million years ago. In the absence of recognizable tilting, this result indicates ~1,700 km of northward translation since about 85 million years ago, which is significantly less than predicted for the Insular terrane in the "Baja British Columbia" model but similar to results from the Intermontane terrane. The pluton ages and the paleomagnetic results suggest that the Intermontane terrane, not the Insular terrane, underlies the southwestern flank of the Coast Mountains Batholith. This conclusion is compatible with a paleogeographic model in which the Vancouver Island fragment of Wrangellia was juxtaposed against the Intermontane terrane prior to about 120 to 100 million years ago and emplaced in southern British Columbia after about 75 million years ago.


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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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