| Title | Textural, mineralogical, lithogeochemical and lead and thallium isotopic characterization of magmatic rocks in Selwyn Basin, Yukon: potential spatial and temporal linkages with lead-zinc
mineralisation |
| Download | Download (whole publication) |
| Author | Scanlan, E J; Leybourne, M I; Layton-Matthews, D; Voinot, A; Van Wagoner, N A |
| Source | Targeted Geoscience Initiative 5, Grant Program interim reports 2018-2019; by Benn, D; Brenan, J M; Fuller, K; Grondahl, C; Layton-Matthews, D; Leybourne, M I; Linnen, R; Martins, T; Milidragovic, D;
Moynihan, D P; Mungall, J E; Nixon, G T; Padget, C D W; Pattison, D R M; Rempel, K U; Scanlan, E J; Scoates, J S; Tsay, A; Voinot, A; Van Wagoner, N A; Weston, R; Williams-Jones, A E; Woods, K; Zajacz, Z; Geological Survey of Canada, Open File 8620,
2019 p. 19-42, https://doi.org/10.4095/314999 (Open Access) |
| Year | 2019 |
| Publisher | Natural Resources Canada |
| Document | open file |
| Lang. | English |
| Media | on-line; digital |
| Related | This publication is contained in Benn, D; Brenan, J M;
Fuller, K; Grondahl, C; Layton-Matthews, D; Leybourne, M I; Linnen, R; Martins, T; Milidragovic, D; Moynihan, D P; Mungall, J E; Nixon, G T; Padget, C D W; Pattison, D R M; Rempel, K U; Scanlan, E J; Scoates, J S; Tsay, A; Voinot, A; Van Wagoner, N
A; Weston, R; Williams-Jones, A E; Woods, K; Zajacz, Z; (2019). Targeted Geoscience Initiative 5, Grant Program interim reports 2018-2019, Geological Survey of Canada, Open File 8620 |
| File format | pdf (Adobe® Reader®) |
| Province | Yukon |
| NTS | 95C; 95D; 95E; 105; 106B; 106C; 106D |
| Lat/Long WENS | -136.0000 -124.0000 65.0000 60.0000 |
| Subjects | economic geology; mineralogy; geochemistry; geochronology; tectonics; Science and Technology; mineral deposits; lead; zinc; ore mineral genesis; mineralization; bedrock geology; lithology; sedimentary
rocks; shales; cherts; igneous rocks; volcanic rocks; mafic volcanic rocks; basalts; metamorphic rocks; metavolcanic rocks; textural analyses; lithogeochemistry; isotopic studies; lead geochemistry; thallium geochemistry; mass spectrometer analysis;
scanning electron microscope analyses; radiometric dating; lead lead dates; zircon dates; petrographic analyses; alkalinity; tectonic setting; magmatism; volcanism; intrusions; dykes, mafic; alteration; deformation; ankerite; calcite; thallium
geochemistry; barium geochemistry; Selwyn Basin; MacMillan Pass District; Anvil District; Keno Hill District; Misty Creek Embayment; Earn Group; Marmot Volcanics; ore systems approach; sedimentary exhalative deposits; SEDEX; eruption styles;
Phanerozoic; Mesozoic; Triassic; Paleozoic |
| Illustrations | location maps; geoscientific sketch maps; stratigraphic charts; photographs; photomicrographs; plots; ternary diagrams; bar graphs; tables |
| Program | Knowledge Management Coordination, Targeted Geoscience Initiative (TGI-5) |
| Released | 2019 08 29 |
| Abstract | Alkaline to subalkaline magmatic rocks in the Selwyn Basin, Yukon may provide evidence of a genetic link to clastic sediment-hosted Pb-Zn deposits in the Anvil and MacMillan Pass districts. To examine
if such a link is present, we document the petrography, lithogeochemical, and thallium isotopic compositions of magmatic rocks in these regions. Anvil District volcanic rocks are interpreted as basaltic effusive eruptions and phreatomagmatic surge
and/or fall deposits, whereas samples from the MacMillan Pass district were emplaced by explosive eruptive activity. The MacMillan Pass samples contain large amounts of ankerite and calcite. Earn Group metavolcanic rocks from the Keno Hill area have
few primary textures to identify eruption dynamics. This group is crosscut by a series of Triassic mafic dikes that exhibit little alteration or deformation. Samples of Marmot Volcanics from the Misty Creek Embayment are effusive basalts. Magmatism
is alkaline in all regions except for Keno Hill, where both the Earn Group metavolcanic rocks and Triassic dikes are subalkaline. Six samples from the MacMillan Pass District have epsilon-205Tl values of -3.2 ± 1.8 to -14.2 ± 3.2. Five samples from
the Anvil District have epsilon-205Tl values of 0.9 ± 1.9 to -6.4 ± 1.2. These preliminary data will be supplemented with additional analyses of mineralised horizons and host shales to investigate the link between high Ba and Tl contents in both the
volcanic rocks and SEDEX deposits. Future work will constrain age relationships between mineralized samples and volcanism, use Pb, Sr and Nd to constrain magma sources and use Tl, Mo and potentially Ba isotopes to examine the link between
mineralisation and magmatism. |
| GEOSCAN ID | 314999 |
|
|