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TitleDetrital zircon lineages of late Neoproterozoic and Cambrian strata, NW Laurentia
AuthorLane, L SORCID logo; Gehrels, G E
SourceGeological Society of America Bulletin vol. 126, no. 3-4, 2014 p. 398-414,
Alt SeriesEarth Sciences Sector, Contribution Series 20130041
PublisherGeological Society of America
Mediapaper; on-line; digital
File formatpdf
ProvinceNorthwest Territories; Yukon; Nunavut
NTS75C; 75D; 75E; 75F; 75K; 75L; 75M; 75N; 76C; 76D; 76E; 76F; 76K; 76L; 76M; 76N; 77C; 77D; 77E; 77F; 77K; 77L; 77M; 77N; 78B; 78C; 85; 86; 87; 88A; 88B; 88C; 88D; 95; 96; 97; 98A; 98B; 98C; 98D; 105; 106; 107; 115; 116; 117
AreaAlaska; Canada; United States of America
Lat/Long WENS-148.0000 -110.0000 74.0000 60.0000
Subjectstectonics; geochronology; stratigraphy; zircon; zircon dates; tectonic interpretations; tectonic evolution; uranium lead ratios; uranium lead dates; paleogeography; provenance; Precambrian; Proterozoic; Paleozoic; Cambrian
Illustrationslocation maps; cross-sections; histograms; plots
ProgramGEM: Geo-mapping for Energy and Minerals Yukon Sedimentary Basins
Released2014 01 24
AbstractThe Phanerozoic tectonic evolution of the Arctic is a field of escalating scientific interest. Detrital zircon provenance studies provide vital contributions to clarify the region's tectonic evolution. Northwest Laurentia exposes a broad expanse of Proterozoic and Paleozoic sedimentary strata for which detrital zircon populations are poorly characterized. Moreover, the significance of sedimentary recycling is becoming better appreciated in light of detrital zircon studies. As more data become available, our understanding of the detrital zircon character of NW Laurentia improves, providing an increasingly reliable baseline at subcontinental resolution against which potentially allochthonous terranes, such as Arctic Alaska, can be assessed.
Sandstones of late Neoproterozoic and Cambrian age from NW Canada yield detrital zircon signatures dominated by zircon grains recycled from Proterozoic sedimentary strata. Two Neoproterozoic sandstones from the northern Mackenzie Mountains yield zircon populations sourced from the Mackenzie Mountains Supergroup. Two Lower Cambrian sandstones sourced from the Yukon stable block and deposited in Richardson Trough have zircon populations nearly identical to those of the upper Wernecke Supergroup, locally exposed across the southern Yukon stable block, where they are unconformably overlain by Cambrian strata. Comparisons with similar studies from NW Canada permit generalizations of the patterns of zircon recycling. Four provenance lineages are described that characterize Laurentia-derived successions in NW Canada.
Summary(Plain Language Summary, not published)
Future resource assessments of Canada's part of the Arctic Ocean basin will require a better understanding of the region¿s geological history. This paper is a base line study. It establishes the age characteristics zircon grains contained in rock units that we know were deposited across NW Canada. This will enable future studies to compare these data to other formations around the Arctic to assess whether they have the same, or different origins. Understanding where the similar rocks and the different rocks occur around the Arctic is one of the important data sets we need, to understand how the Arctic Ocean basin formed.

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