| Title | Research in geochemical prospecting methods for fluorite deposits, Madoc area, Ontario |
| Download | Downloads |
| |
| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Lalonde, J P |
| Source | Geological Survey of Canada, Paper 73-38, 1974, 56 pages (3 sheets), https://doi.org/10.4095/102540  Open Access |
| Links | Canadian Database of Geochemical Surveys, downloadable
files
|
| Links | Banque de données de levés géochimiques du Canada,
fichiers téléchargeables
|
| Year | 1974 |
| Document | serial |
| Lang. | English |
| Maps | Publication contains 1 map |
| Map Info. | geological, 1:126,720 |
| Media | paper; on-line; digital |
| File format | pdf |
| Province | Ontario |
| NTS | 31C/05; 31C/06; 31C/11; 31C/12 |
| Area | Madoc |
| Lat/Long WENS | -77.6667 -77.2833 44.5833 44.3833 |
| Subjects | geochemistry; industrial minerals; fluorine geochemistry; fluorite; prospecting techniques; sampling techniques; soil geochemistry; stream sediment geochemistry; water geochemistry; Precambrian;
Paleozoic; Cenozoic |
| Released | 1974 10 01; 2016 02 15 |
| Abstract | The 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 ID | 102540 |
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