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TitleGeochemical Studies in the eastern Part of the Slave Structural Province, 1973
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorCameron, E M; Durham, C C
SourceGeological Survey of Canada, Paper 74-27, 1974, 29 pages (5 sheets), Open Access logo Open Access
LinksCanadian Database of Geochemical Surveys, downloadable files
LinksBanque de données de levés géochimiques du Canada, fichiers téléchargeables
PublisherEnergy, Mines and Resources Canada
MapsPublication contains 11 maps
Map Info.geochemical, 1:12,000
Map Info.geochemical, 1:50,000
Map Info.geochemical, 1:126,720
Map Info.geochemical, 1:120,000
Mediapaper; on-line; digital
File formatpdf
ProvinceNorthwest Territories; Nunavut
NTS76B/10; 76B/11; 76B/14; 76B/15; 76F/01; 76F/02; 76F/07; 76F/08; 76F/09; 76F/10; 76F/15; 76F/16; 76G/02; 76G/03; 76G/04; 76G/05; 76G/06; 76G/07; 76G/10; 76G/11; 76G/12; 76G/13; 76G/14
Lat/Long WENS-109.0000 -106.5000 66.0000 64.5000
Subjectsgeochemistry; industrial minerals; metallic minerals; arsenic; barium; beryllium; calcium; chromium; cobalt; copper; gossans; hydrothermal alteration; iron; lake sediment geochemistry; lanthanum; lead; lithium; magnesium; manganese; mercury; molybdenum; nickel; petrography; potassium; rock geochemistry; silver; soil geochemistry; soil studies; strontium; titanium; trace element distribution; alteration; Slave Province; Yellowknife Supergroup
Illustrationsafm diagrams
Released1974 05 01; 2015 08 06
AbstractIn 1972 a geochemical reconnaissance survey was carried out over 36, 000 square miles of the Bear and Slave Structural Provinces of the northern Canadian Shield. This survey sampled nearshore lake sediments at an average density of one per 10 square miles. In 1973 a detailed follow-up survey was carried out in the eastern part of the survey area. Lake sediment, soil and rock samples were collected. This work was done to assist interpretation of the 1972 data and to establish the validity of the use of lake sediments for geochemical reconnaissance in the northern Shield. The area chosen for study was the western margin of the Beechey Lake belt in the eastern part of the Slave Province. Here, the published reconnaissance geological mapping showed metasedimentary rocks in contact with granites. However, the base metal and major element geochemistry of the lake sediments collected in 1972 indicated the possible presence of massive sulphide mineralization associated with acidic volcanic rocks. Three anomalies of this type were studied in detail. Two of these anomalies were shown to be extensive and are caused by exhalative mineralization within volcanic rocks of intermediate to acidic composition. The third anomaly was found to be small in extent and caused by disseminated sulphides in basic and intermediate volcanic rocks. Other anomalies of this type were studied in less detail. A second type of anomaly found during the reconnaissance was for U in granitic terrane. The rocks in and around the largest of these anomalies were sampled and the anomaly was shown to be caused, in part at least, by a higher background content of U in the granites. Whether the anomaly is also related to U mineralization was not established. The success of geochemical exploration within this region derives in large part from active postglacial oxidation. This has caused the more mobile components of sulphide mineralization, such as Zn and Cu, to be carried away in solution to the lakes, while the less mobile components, such as Pb, Ag and Au, are retained in the soils overlying mineralization. This allows the use of lake samples for wide-interval reconnaissance sampling and soil sampling for detailed follow-up work. A number of other factors contribute to the success of the method. These include the relatively high relief of the volcanic rocks which allows the wide dispersion of drainage waters containing metal in solution and the general absence of precipitation barriers in the drainage system. In addition to the information on secondary dispersion, data are given on the geochemical composition of the volcanic rocks and their petrology, and on primary dispersion around mineralization.

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