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TitleGeochemistry of the Neoproterozoic to Cambrian mafic volcanic rocks of the Jaeger Lake assemblage and the Yelverton Formation, Nunavut
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LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorDockman, D M; Hadlari, TORCID logo; Dewing, KORCID logo
SourceGeological Survey of Canada, Open File 8555, 2019, 13 pages, https://doi.org/10.4095/314659 Open Access logo Open Access
Image
Year2019
PublisherNatural Resources Canada
Documentopen file
Lang.English
Mediaon-line; digital
File formatpdf
ProvinceNunavut
NTS340B/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
AreaEllesmere Island; Axel Heiberg Island; Canadian Arctic Archipelago
Lat/Long WENS -96.0000 -76.0000 82.2500 80.7500
Subjectsgeochemistry; 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
Illustrationslocation maps; geoscientific sketch maps; stratigraphic charts; diagrams; plots; ternary diagrams
ProgramGEM2: Geo-mapping for Energy and Minerals Western Arctic, Pearya Terrane, North Ellesmere
Released2019 05 15
AbstractBasaltic 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 ID314659

 
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