| Title | Geochemistry of the Neoproterozoic to Cambrian mafic volcanic rocks of the Jaeger Lake assemblage and the Yelverton Formation, Nunavut |
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| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Dockman, D M; Hadlari, T ; Dewing, K |
| Source | Geological Survey of Canada, Open File 8555, 2019, 13 pages, https://doi.org/10.4095/314659  Open Access |
| Image |  |
| Year | 2019 |
| Publisher | Natural Resources Canada |
| Document | open file |
| Lang. | English |
| Media | on-line; digital |
| File format | pdf |
| Province | Nunavut |
| NTS | 340B/13; 340B/14; 340B/15; 340B/16; 340C; 340D/03; 340D/04; 340D/05; 340D/06; 340D/11; 340D/12; 340D/13; 340D/14; 340E/03; 340E/04; 340F/01; 340F/02; 340F/03; 340F/04; 560A/13; 560A/14; 560A/15; 560A/16;
560D |
| Area | Ellesmere Island; Axel Heiberg Island; Canadian Arctic Archipelago |
| Lat/Long WENS | -96.0000 -76.0000 82.2500 80.7500 |
| Subjects | geochemistry; stratigraphy; tectonics; bedrock geology; lithology; igneous rocks; volcanic rocks; mafic volcanic rocks; basalts; intrusive rocks; sedimentary rocks; carbonates; cherts; stratigraphic
analyses; tectonic setting; volcanism; intrusions; sills; partial melting; geochemical analyses; major element analyses; trace element analyses; petrogenesis; provenance; Jaeger Lake Assemblage; Yelverton Formation; Neoproterozoic; Northern Heiberg
Fold Belt; Clements Markham Fold Belt; Hazen Trough; Aurland Fiord Formation; Phanerozoic; Paleozoic; Cambrian; Precambrian; Proterozoic |
| Illustrations | location maps; geoscientific sketch maps; stratigraphic charts; diagrams; plots; ternary diagrams |
| Program | GEM2: Geo-mapping for Energy and Minerals Western Arctic, Pearya Terrane, North Ellesmere |
| Released | 2019 05 15 |
| Abstract | Basaltic rocks of the Jaeger Lake assemblage of Axel Heiberg Island and the Yelverton Formation of Ellesmere Island are Neoproterozoic to Cambrian in age and outcrop in a stratigraphic package dominated
by carbonate. A lack of modern geochemical data on these basalts has limited the ability to correlate the two assemblages and to comment on the tectonic setting from which they were generated.
Major, Trace, and Rare Earth Element (REE)
geochemistry was performed on three samples collected by the Geological Survey of Canada (GSC) during the 2015-2017 field seasons. Trace element analysis indicates that volcanic flows of the Jaeger Lake assemblage and sills within the Yelverton
Formation are sub-alkaline basalts that form a geochemical array along a garnet-lherzolite petrogenetic trend. One sample from each assemblage has an REE pattern indicative of a magma derived from a garnet-bearing, EMORB source, while one Jaeger Lake
sample has a strongly depleted, NMORB-like REE pattern.
We hypothesize that all 3 samples are from the same EMORB source and that the strongly depleted sample is the result of extreme, iterative partial melting. Trace elements alone cannot
determine if this hypothesis is correct, so an ongoing Sr-Nd and U-Pb study is being undertaken to comment on the age and source characteristics of these understudied basalts. |
| Summary | (Plain Language Summary, not published)
Two groups of volcanic rocks from Axel Heiberg Island (the Jaeger Lake Assemblage) and Ellesmere Island (the Yelverton Formation), Nunavut, were analysed
to determine their chemistry. They are assumed to be roughly 700 to 500 million years old. Understanding their chemistry allows us to determine if the two groups of rocks, which are separated by 200 km, are related and the conditions under which they
were formed. Preliminary analysis shows that the two groups are likely related and were generated from a deep region within the earth's mantle (greater than 70 km) that is chemically enriched. There also may have been several melting events. Further
chemical investigation is needed and is being undertaken to verify this hypothesis. |
| GEOSCAN ID | 314659 |
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