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TitleA Pangean Rim of Fire: reviewing the Triassic of western Laurentia
AuthorHadlari, T; Midwinter, D; Poulton, T P; Matthews, W A
SourceLithosphere vol. 9, no. 4, 2017 p. 579-582, (Open Access)
Alt SeriesEarth Sciences Sector, Contribution Series 20160361
PublisherGeological Society of America
Mediapaper; on-line; digital
File formatpdf
Subjectsuranium lead dates; modelling; subduction zones; magmatic arcs; structural basins; Quesnel terrane; Yukon-Tanana terrane; rim of fire; Triassic
Illustrationslocation maps; graphs
ProgramWestern Cordillera, Regional porphyry transitions, GEM2: Geo-mapping for Energy and Minerals
Released2017 04 13
AbstractA synthesis of U-Pb detrital zircon data from the Triassic of western Laurentia is placed in the context of paleogeographic models for Pangea. We find that an emerging body of evidence supports the hypothesis that a Triassic subduction zone and continental magmatic arc system fringed western Laurentia starting in the southwestern United States, continuing northward along the Cordillera, including arc rocks of the Quesnel and Yukon-Tanana terranes, and extending further into the Arctic region. In the context of this geodynamic setting, the western interior basins of North America would have formed, probably by subduction dynamics, as a collage of backarc and retroarc foreland basins. The convergent tectonic model for western Laurentia is consistent with paleogeographic reconstructions that show a subduction zone encircling Pangea, called the Pangean rim of fire.
Summary(Plain Language Summary, not published)
This work links the basin tectonic histories of the Canadian Arctic with the Rocky Mountains and southwestern US. It provides a framework to understand hydrocarbon source rocks of Triassic age throughout North America.