File:Microdiamondiferous ultrapotassic minette (Akluilak Dike System, Paleoproterozoic, 1.832 Ga; Gibson Lake area, Central Churchill Province, northern Canada) 1.jpg
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[edit]DescriptionMicrodiamondiferous ultrapotassic minette (Akluilak Dike System, Paleoproterozoic, 1.832 Ga; Gibson Lake area, Central Churchill Province, northern Canada) 1.jpg |
English: Akluilâk Dike - microdiamondiferous minette from the late Paleoproterozoic (1.832 Ga) of the Gibson Lake area, northern Canada (4.2 centimeters across at its widest).
This is an ultrapotassic minette, a rare intrusive igneous rock. Minettes are potassic mica lamprophyres. The dark crystals are biotite mica. The light-colored crystals are orthoclase feldspar. This particular minette is microdiamondiferous, and comes from the Akluilâk Dike System of the Central Churchill Province, northern Canada. The Akluilâk Dikes were intruded during the late Paleoproterozoic, at about 1.832 billion years ago. Microdiamonds found in these rocks are ~2 billion years old. Locality: Gibson Lake area, Gibson-MacQuoid Lake Belt, ~120 km northwest of Rankin Inlet, District of Keewatin, Northwest Territories (sensu lato) (“Nunavut”), northern Canada (approximately 63º 35’ North, 93º 30’ West). See MacRae et al. (1996) for more info.: MacRae, N.D., A.E. Armitage, A.R. Miller, J.C. Roddick, A.L. Jones & M.P. Mudry. 1996. The diamondiferous Akluilâk lamprophyre dyke, Gison Lake area, N.W.T. in Searching for diamonds in Canada. Geological Survey of Canada Open File 3228: 101-107. |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/14637088540/ |
Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/14637088540. It was reviewed on 2 November 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
2 November 2020
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current | 17:02, 2 November 2020 | 2,028 × 1,746 (2.04 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/14637088540/ with UploadWizard |
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Orientation | Normal |
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Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 22:38, 3 August 2014 |
Color space | sRGB |
Image width | 2,028 px |
Image height | 1,746 px |
Date and time of digitizing | 18:38, 3 August 2014 |
Date metadata was last modified | 18:38, 3 August 2014 |