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Geological Survey of Canada, Current Research (Online) no. 2005-A2

Author : K. Wetherell

Publisher : Natural Resources Canada

Page : 12 pages

File Size : 14,35 MB

Release : 2005

Category : Geology

ISBN : 0662411226

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Book Description

The West Tuya lava field is located about 95 kilometres north-north-west of Dease Lake, British Columbia. This report presents an overview & summary of field work, geographic information system spatial analysis, and preliminary petrographic analysis conducted at the field in 2003-04. Highlights of this work include: identification of three sub-aerial shield volcanoes and their mineral composition; confirmation that mantle-derived peridotite inclusions are present at two of the volcanoes; and interpretation of the sub-aerial lava flows. The minimum and maximum volumes of material erupted are also estimated.





Geological Survey of Canada, Current Research (Online) no. 2005-C3

Author : David Snyder

Publisher : Natural Resources Canada

Page : 13 pages

File Size : 28,43 MB

Release : 2005

Category : Geochemistry

ISBN : 0662407180

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Book Description

This paper describes a novel, high-resolution application of cross-borehole seismology at the Snap Lake diamond mine, Northwest Territories, to assess whether the relatively thin kimberlite dyke that hosts the diamonds could be mapped underground with sufficient resolution to accurately estimate its volume and to guide mining. Subsequent mining and mapping with the 50-by-70-metre test panel indicated whether the technique was able to map the top & bottom surfaces of the dyke and to identify ramps, pinch-outs, and cross-cutting fracture planes. The tests also compared the performance of that new technique with two other geophysical methods, high-frequency vibrating seismic surveying and ground penetrating radar.













Geological Survey of Canada, Current Research (Online) 2005-A4

Author : Mike E. Villeneuve

Publisher : Natural Resources Canada

Page : 9 pages

File Size : 12,17 MB

Release : 2005

Category : Geological time

ISBN : 0662418921

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Book Description

The Quilchena fossil site in the Okanagan Highlands of south central British Columbia is a rich repository of Eocene plant, insect, & fish fossils. Reliable age assignment of this site is critical in order to reconstruct the biogeographic, climatic, & evolutionary relationships between the flora & fauna of the Okanagan Highlands and those of other Tertiary sites around the world. Previous radiometric age determinations have been variable and inconclusive. This paper presents new data using uranium-lead dating of zircons from a thick tephra combined with argon-argon dating of sanidine crystals from the same bed. The age determined can be securely ascribed to the Quilchena fossils, since the dated tephra was deposited within the fossil-bearing shale & mudstone sequences.