| Title | New U-Pb dates from southwestern Coast Belt, British Columbia |
| Download | Download (whole publication) |
| Author | Monger, J W H; McNicoll, V J |
| Source | Radiogenic age and isotopic studies: report 7; by Geological Survey of Canada; Geological Survey of Canada, Paper no. 93-2, 1993 p. 119-126, https://doi.org/10.4095/193341 |
| Year | 1993 |
| Publisher | Natural Resources Canada |
| Document | serial |
| Lang. | English |
| Media | paper |
| Related | This publication is contained in Geological Survey of
Canada; (1993). Radiogenic age and isotopic studies: report 7, Geological Survey of Canada, Paper no. 93-2 |
| Province | British Columbia |
| NTS | 92G/NW; 92K |
| Area | Quadra Island; Bute Inlet; Howe Sound |
| Lat/Long WENS | -126.0000 -123.0000 51.0000 49.5000 |
| Subjects | geochronology; granites; igneous rocks; zircon dates; uranium lead dates; radiometric dates; Mount Roderick Granodiorite; Ward Point Pluton; Paradise River Pluton; Bodega Point Pluton; Coast Belt;
Insular Belt; Jurassic; Cretaceous |
| Illustrations | sketch maps; analyses; Concordia diagrams |
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| Released | 1994 01 01 |
| Abstract | 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. |
| GEOSCAN ID | 193341 |
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