
doi: 10.4095/193341
Four new U-Pb dates of granitic rocks from the southwestern Coast Belt are reported. The Bodega Point pluton on Quadra Island, Bute Inlet map-area (92K), is the westernmost Coast Belt pluton at this latitude and intrudes Wrangellian stratigraphy; it has been dated at 163.8 +/- 0.4 Ma, Middle Jurassic. To the northeast, along Bute Inlet, two samples were analyzed from a region of granitic rocks previously mapped as mostly of Cretaceous age. The Paradise River pluton, at 145 +/- 2 Ma, is latest Jurassic, similar in age to the Cloudburst quartz diorite in Vancouver map area (92G). The Ward Point pluton is 153.6 +/- 0.4 Ma, Late Jurassic; this age is comparable to others in southwestern Coast Belt. Granodiorite on Mount Roderick, apparently part of a regionally extensive composite body herein called the Howe Sound batholith, yields a mid-Cretaceous age of 95.8 +/- 1 Ma. This date places a maximum age on contractional deformation on the Britannia shear zone near Howe Sound, and falls within the period spanned by regional deformation in the southeastern Coast Belt.
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