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TitleInitiation and early evolution of the Franklin magmatic event preserved in the 720 Ma Natkusiak Formation, Victoria Island, Canadian Arctic
AuthorWilliamson, N; Ootes, L; Rainbird, R; Cousens, B; Bedard, J
SourceJournal of Volcanology and Geothermal Research vol. 78, no. 3, 2016 p. 1-19, https://doi.org/10.1007/s00445-016-1012-9
Year2016
Alt SeriesEarth Sciences Sector, Contribution Series 20150408
PublisherSpringer
Documentserial
Lang.English
Mediapaper
File formatpdf
ProvinceNorthwest Territories; Nunavut
NTS77F; 77G; 78B; 87E; 87F; 87G; 87H; 88A; 88B
AreaVictoria Island
Lat/Long WENS-120.0000 -108.0000 73.0000 70.0000
Subjectsgeochemistry; structural geology; general geology; regional geology; stratigraphy; tectonics; volcanology; volcano-sedimentary strata; basalts; pyroclastics; sills; lavas; lava flows; volcanism; mafic volcanic rocks; dykes, mafic; continental flood basalts; large igneous province; Proterozoic
Illustrationslocation maps; sketch maps; cross-sections; Landsat images; photographs; diagrams; tables; photomicrographs; graphs
ProgramMackenzie Corridor, Shield to Selwyn, GEM2: Geo-mapping for Energy and Minerals
AbstractOur understanding of the onset and evolution of flood basalt volcanism is rooted in the study of the character and internal architecture of its eruptive products. Neoproterozoic continental flood basalts of the ca. 720 Ma Franklin magmatic event are preserved as the Natkusiak Formation and are exposed within the Minto Inlier on Victoria Island, Northwest Territories, Canada. The 200 m volcanic succession evaluated in this study has features similar to those of other continental flood basalt provinces and consists of four volcanic units: a basal unit of laterally discontinuous flows with evidence for lava-sediment interactions, a mafic volcaniclastic deposit emplaced as a mass flow, a quartz-rich volcanic sandstone that records the re-establishment of small river channels, and a unit of thick, high-titanium tholeiitic sheet flows that mark the onset of the main phase of flood volcanism. The basal units show marked lateral thickness variations that imply the existence of paleotopography during their eruption and/or deposition. In addition, two newly discovered volcanic vent complexes within the Natkusiak succession preserve the products of explosive, vent-forming basaltic pyroclastic fall eruptions. Differences in major element geochemistry between the basal and upper basaltic flow units, in conjunction with the lithological characteristics of each volcanic unit, are used to correlate the units on a scale of over 100 km from the south of the Minto Inlier to the north.
Summary(Plain Language Summary, not published)
Continental flood basalts of the Neoproterozoic Franklin Magmatic Event are preserved as the Natkusiak Formation and are exposed within the Minto Inlier on Victoria Island, Northwest Territories, Canada. The volcanic stratigraphy has features similar to those of other Continental Flood Basalt Provinces. It consists of four volcanic units: a basal unit of laterally discontinuous lava flows, a volcanic-sedimentary deposit emplaced as a mass flow, a quartz-rich volcanic sandstone, and a unit of thick, iron-rich volcanic flows that mark the onset of the main phase of flood volcanism. The lower 3 units show lateral thickness variations implying ancient topography during their deposition. Differences in geochemistry and lithology between the basal and upper lava flows are used to correlate the units on a scale of over 100km from the south of the Minto Inlier to the north.
GEOSCAN ID297530