| Title | Kimberlite indicator mineral chemistry of the Bucke and Gravel kimberlites and associated indicator minerals in till, Lake Timiskaming, Ontario |
| Download | Downloads |
| |
| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | McClenaghan, M B ;
Kjarsgaard, I M; Kjarsgaard, B A |
| Source | Geological Survey of Canada, Open File 5815, 2012, 26 pages; 1 CD-ROM, https://doi.org/10.4095/289599  Open Access |
| Links | Erratum
|
| Links | Canadian Database of Geochemical Surveys, downloadable
files
|
| Links | Banque de données de levés géochimiques du Canada,
fichiers téléchargeables
|
| Year | 2012 |
| Publisher | Natural Resources Canada |
| Document | open file |
| Lang. | English |
| Media | CD-ROM; digital; on-line |
| File format | readme
|
| File format | pdf; rtf; xls |
| Province | Ontario |
| NTS | 31M/05 |
| Area | Lake Timiskaming |
| Lat/Long WENS | -79.7833 -79.6000 47.5000 47.3667 |
| Subjects | economic geology; geochemistry; surficial geology/geomorphology; indicator elements; drift prospecting; drift geochemistry; dispersal patterns; diamond; kimberlites; mineral exploration; glacial
deposits; tills; till geochemistry; lithology; pyrope; ilmenite; olivine; garnet; diopside; chromite; enstatite; ice transport directions; ice movement directions; Bucke Kimberlite; Gravel Kimberlite; Mesozoic; Jurassic |
| Illustrations | location maps; plots; tables |
| Program | Targeted Geoscience Initiative (TGI-1), 2000-2003 |
| Released | 2012 02 02; 2012 03 06 |
| Abstract | A well documented glacial dispersal fan of kimberlite indicator minerals extends southward from the region of the Late Jurassic Bucke and Gravel kimberlites in the Lake Timiskaming kimberlite field of
northeastern Ontario. The Geological Survey of Canada collected and analyzed a sample of kimberlite from both pipes and re-examined and analyzed indicator minerals from archived heavy mineral concentrates of till samples from the dispersal fan. The
Bucke kimberlite contains more than 30,000 indicator mineral grains per 10 kg sample in the 0.25 to 0.5 mm fraction, which consists of, in decreasing order of abundance, Crpyrope>> Mg-ilmenite>chromite>Cr-diopside. The Gravel kimberlite is three
times as indicator mineral rich, containing more than 100,000 grains per 10 kg sample in the 0.25 to 0.5 mm fraction, which consist of Mg-ilmenite>>Cr-pyrope>chromite>Cr-diopside. No olivine was recovered from either sample. Till samples within the
fan contain 100s to 1000s of indicator minerals per 10 kg sample, mostly Mg-ilmenite, with Cr-pyrope and chromite, and lesser amounts of Cr-diopside and minor olivine. Indicator minerals are most abundant to the southwest to southeast of the two
kimberlites and form a fan-shaped dispersal pattern that extends at least 6 km, and potentially 30 km down-ice. The results presented here demonstrate how ice-flow mapping can be combined with indicator mineral abundance, mineral chemistry, and
relative abundance data to define dispersal patterns from kimberlite. |
| GEOSCAN ID | 289599 |
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