Soil, Till, Vegetation, Bedrock, Indicator minerals, Selective extraction
Multimedia survey, NTS 53L, M, east central Manitoba, 2000.
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In 2000, multimedia geochemical samples, including humus, soil, till, vegetation and rocks were collected in the northern portion of the Knee Lake greenstone belt in east central Manitoba as part of Operation Superior. Samples were collected on approximately 1 km centres or as dictated by access to landing sites using a float equipped helicopter. A till pit was hand augered at each site and all other samples were collected in and around the immediate area of the till pit.
Humus samples were collected from beneath the moss mat that was normally removed prior to digging the till sample pit. If the humus layer was too thin, the sample site was moved 5-10 m away from the till pit. Care was taken to avoid any inorganic material. Duplicate samples were collected at approximately every fifteenth site.
B-horizon soil samples were collected from the pit dug for the till samples. The B-horizon was isolated on a clean face of one or more walls of the pit and then scooped into a sample bag. Care was taken not to include any organic material. Duplicate samples were collected at every tenth site.
Approximately 326 till samples were collected from hand-dug pits to bedrock, a maximum depth of about 1 m or until relatively unoxidized C-horizon till was intersected.
Between June and August 2000, black spruce crown twigs were collected from each sampling site. At most sites, the vegetation was collected within 20 m of the till pit. The twigs were collected from the upper 45 cm of the tree.
Outcrop rock chip samples were collected after moss mats and soil were removed from the outcrop. A representative sample consisted of 3-4 fist-sized chips.
The data are published in Manitoba Industry, Trade and Mines Open File Report OF2001-1.
Kimberlite indicator mineral (KIM) data are also available in Manitoba Geological Survey Open File Reports OF2001-5 and OF2002-1.
Paper and digital.
<0.177 mm fraction of humus by ICP-AES (four-acid total digestion) and by INAA.
<0.250 mm fraction of B-horizon soil by enzyme-leach ICP-MS; ICP-AES analysis of the enzyme leachate was done for Mn, A., Ca, Fe, Na, Mg, K and Si.
<0.002 mm fraction of till by ICP-AES (no digestion given); As by hydride ICP-AES; Hg by CV-ICP-AES. <0.063 mm fraction of till by INAA (Au + 34 elements).
Ashed vegetation samples were analysed by ICP-AES after an aqua regia dissolution and by INAA.
Geochem Maps Available:
Proportional dot maps showing distribution of elements in various sample media.
<0.063 mm fraction of till for carbonate analysis (Chittick).
|1||Fedikow, M.A.F., Nielsen, E., Conley, G.G., Lenton, P.G. (2001). Operation Superior: kimberlite indicator mineral survey results for the northern half of the Knee Lake greenstone belt, northern Superior Province, Manitoba (NTS 53M/1, 2, 3, 7 and 53L/15). Manitoba Industry, Trade and Mines, Manitoba Geological Survey, Open File Report OF2001-5. (more)|
|2||Fedikow, M.A.F., Nielsen, E., Conley, G.G., Lenton, P.G. (2001). Operation Superior: multimedia geochemical survey results from the northern portion of the Knee Lake greenstone belt, northern Superior Province, Manitoba (NTS 53L). Manitoba Industry, Trade and Mines, Manitoba Geological Survey, Open File Report OF2001-1. (more)|
|3||Fedikow, M.A.F., Nielsen, E., Conley, G.G., Lenton, P.G. (2002). Operation Superior: compilation of kimberlite indicator mineral survey results (1996-2001). Manitoba Industry, Trade and Mines, Manitoba Geological Survey, Open File Report 2002-1, 60 p. (more)|
|4||Keller, G.R., Bogdan, D.J., Matile, G.L.D. (2004). Manitoba kimberlite indicator mineral database (version 3.0). Manitoba Industry, Economic Development and Mines, Manitoba Geological Survey, Open File Report 2004-25. (more)|
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The geographic extent of the survey is defined by the following polygons:
Covers parts of NTS 53L (Oxford House) and 53M (Knee Lake), the northern part of the Knee Lake greenstone belt, east central Manitoba. Its southern border is located approximately 42 km northwest of the community of Gods Lake Narrows. Knee Lake is located approximately in the centre of the study area.
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