| Title | Indicator mineralogy of the KL-01 and KL-22 kimberlites, Lake Timiskaming kimberlite field, 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 5800, 2008, 47 pages; 1 CD-ROM, https://doi.org/10.4095/225398  Open Access |
| Links | Canadian Database of Geochemical Surveys, downloadable
files
|
| Links | Banque de données de levés géochimiques du Canada,
fichiers téléchargeables
|
| Year | 2008 |
| Publisher | Natural Resources Canada |
| Document | open file |
| Lang. | English |
| Media | CD-ROM; digital; on-line |
| Related | This publication is related to Mineral chemistry database
for kimberlite, surficial sediments and kimberlite boulders from the Lake Timiskaming and Kirkland Lake kimberlite fields, Ontario and Quebec |
| File format | readme
|
| File format | pdf (Adobe® Reader®); xls (Microsoft Excel) |
| Province | Ontario |
| NTS | 41P/08 |
| Area | Lake Timiskaming |
| Lat/Long WENS | -80.1667 -80.0833 47.4833 47.3833 |
| Subjects | geochemistry; surficial geology/geomorphology; economic geology; esker geochemistry; eskers; kimberlites; pipes; plutonic rocks; igneous rocks; glaciofluvial deposits; sands; boulders; pebble lithology;
heavy minerals; heavy mineral analyses; ilmenite; chromite; garnet; clinopyroxene; olivine; perovskite; diopside; lherzolites; websterites; pyroxenites; eclogites; diamond; paragenesis; peridotites; harzburgites; tills; ice transport directions;
fluvial transport; mineral exploration; source areas; Archean; carbonates; petrography; pyrope; orthopyroxene; Lake Timiskaming kimberlite field; Kl-01 kimberlite; KL-02 kimberlite; Phanerozoic; Cenozoic; Quaternary; Paleozoic; Precambrian |
| Illustrations | sketch maps; photographs; tables; plots |
| Program | Targeted Geoscience Initiative (TGI-1), 2000-2003 |
| Released | 2008 06 01; 2008 06 02 |
| Abstract | Kimberlite and till samples from the recently discovered KL-01 and KL-22 kimberlites in the Lake Timiskaming kimberlite field, northeastern Ontario, have been studied by the Geological Survey of Canada
to determine their kimberlite indicator mineral signatures. These new results compliment earlier work published on the Lake Timiskaming kimberlites by the GSC. The KL-01 kimberlite is covered by only 1 to 4 m of till and thus is deeply weathered. The
KL-22 kimberlite is covered by more than 10 m of glacial sediments and thus is fresh at its subcropping surface. Both kimberlites contain thousands of indicator minerals per 10 kg in the 0.25 to 0.5 mm fraction. The kimberlites, however, are
characterized by different relative abundance of indicator mineral species. The 0.25 to 2.0 mm fraction of the KL-22 kimberlite is dominated by chromite, with lesser amounts of Cr-pyrope and Cr-diopside, very few Mg-ilmenite, scarce eclogitic
garnets, and no olivine. The 0.25 to 2.0 mm fraction of the KL-01 kimberlite is dominated by Cr-pyrope, with lesser amounts of chromite, Mg-ilmenite and Cr-diospide, scarce eclogitic garnets, and no olivine. Till overlying the KL-22 kimberlite
contains only a few tens of indicator mineral grains and does not contain much garnet, a relatively abundant indicator mineral in the KL-22 kimberlite. Thus this till likely reflects background concentrations in the area rather than incorporation of
KL-22 kimberlite debris. Indicator mineral populations of the KL-01 and KL-22 kimberlites are dominated by chromite, Crpyrope, and Cr-diopside from fertile garnet lherzolite. Subcalcic garnets are abundant as well but they are only marginally Cr-rich
with respect to diamond potential and magnesiochromites include some diamond inclusion and diamond intergrowth field. Garnet megacrysts are rare in both kimberlites, as are orange diamond sub-class eclogite garnets. Similar mineral compositions and
age dates for the two kimberlites strongly suggest that KL-01 and KL-22 are genetically related. |
| GEOSCAN ID | 225398 |
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