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TitleResearch in geochemical prospecting methods for fluorite deposits, Madoc area, Ontario
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorLalonde, J P
SourceGeological Survey of Canada, Paper 73-38, 1974, 56 pages (3 sheets), https://doi.org/10.4095/102540 Open Access logo Open Access
LinksCanadian Database of Geochemical Surveys, downloadable files
LinksBanque de données de levés géochimiques du Canada, fichiers téléchargeables
Year1974
Documentserial
Lang.English
MapsPublication contains 1 map
Map Info.geological, 1:126,720
Mediapaper; on-line; digital
File formatpdf
ProvinceOntario
NTS31C/05; 31C/06; 31C/11; 31C/12
AreaMadoc
Lat/Long WENS-77.6667 -77.2833 44.5833 44.3833
Subjectsgeochemistry; industrial minerals; fluorine geochemistry; fluorite; prospecting techniques; sampling techniques; soil geochemistry; stream sediment geochemistry; water geochemistry; Precambrian; Paleozoic; Cenozoic
Released1974 10 01; 2016 02 15
AbstractThe known fluorite deposits occur in Precambrian marble and Paleozoic limestone as irregular and discontinuous veins in faults and frac­tures. The veins contain fluorite, calcite, barite, celestite, and minor amounts of sulphides including pyrite, marcasite, and sphalerite. The secondary dispersion of fluorine was studied regionally by sam­pling 45 soil profiles along two regional traverses, collecting approximately 60 stream sediment, 80 surface water, and 200 groundwater samples. Soils were also collected along seven detailed traverses crossing known fluorite veins or their extensions. Fluorine was determined by selective ion elec­trode, zinc by atomic absorption spectrophotometry, and barium and stront­ium by X-ray fluorescence. Most rock types of the Madoc area are fluorine-rich and contain between 1,000 and 2, 700 ppm F. Several surface water anomalies associated with areas of fluorite occurrences were located, and dispersion trains are traceable for several miles. The fluorine content of stream sediments is, however, of limited use in geochemical exploration because of the smalt con­trast between background and anomalous concentrations. The fluorine content of groundwaters clearly delineates areas containing known fluorite occur­rences as well as other targets of interest; a positive correlation exists between groundwater anomalies and fluorine-rich soils along the regional traverses. The lateral dispersion of fluorine in soils overlying subcropping fluorite veins is restricted and, therefore, can be used to pin-point such occurrences. The most favourable soil horizon to sample for all elements studied is the organic A horizon which accentuates the contrast between back­ground and anomalous concentrations. Barium and zinc in soils are also good tracers for fluorite veins; but strontium proved to be ineffective. The water-soluble fluorine content of the A soil horizon can be used as an inex­pensive field test. Geochemical exploration methods proved useful to re-evaluate the potential of the area and can help locate new deposits.
GEOSCAN ID102540

 
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