Geochemical constraints on the provenance of pre-Mississippian sedimentary rocks in the North Slope subterrane of Yukon and Alaska

Lyle L Nelson; Justin V Strauss; Peter W Crockford; Grant M Cox; Benjamin G Johnson; William Ward; Maurice Colpron; William C McClelland; Francis A Macdonald

doi:10.1130/2018.2541(24)

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Geochemical constraints on the provenance of pre-Mississippian sedimentary rocks in the North Slope subterrane of Yukon and Alaska

Book chapter

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Geochemical constraints on the provenance of pre-Mississippian sedimentary rocks in the North Slope subterrane of Yukon and Alaska

Lyle L Nelson, Justin V Strauss, Peter W Crockford, Grant M Cox, Benjamin G Johnson, William Ward, Maurice Colpron, William C McClelland and Francis A Macdonald

Circum-Arctic Structural Events: Tectonic Evolution of the Arctic Margins and Trans-Arctic Links with Adjacent Orogens, pp.573-592

GSA Special Papers, 541, The_Geological_Society_of_America

06/14/2019

DOI: 10.1130/2018.2541(24)

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Abstract

The North Slope subterrane of Arctic Alaska extends from the northeastern Brooks Range of Alaska into adjacent Yukon, Canada, and includes a pre-Mississippian deep-water sedimentary succession that has been historically correlated with units exposed in the Selwyn basin of northwestern Laurentia. Sedimentary provenance data, including Sm-Nd isotopes and major and trace element geochemistry, provide detailed geochemical characterization of the regional pre-Mississippian strata of the North Slope subterrane. Combined with paleontological and geochronological age constraints, these new data record a marked shift in provenance in the Ordovician–Devonian(?) Clarence River Group, evidently linked to an influx of juvenile, arc-derived material. The timing and nature of this provenance change are consistent with early Paleozoic tectonic reconstructions of the Arctic margin that restore the North Slope subterrane to northeastern Laurentia (present coordinates), proximal to the Appalachian-Caledonian orogenic belt. Such a restoration requires significant post-Early Devonian sinistral strike-slip displacement to later incorporate the North Slope subterrane into the composite Arctic Alaska terrane.

Details

Title: Subtitle: Geochemical constraints on the provenance of pre-Mississippian sedimentary rocks in the North Slope subterrane of Yukon and Alaska
Creators: Lyle L Nelson
Justin V Strauss
Peter W Crockford
Grant M Cox
Benjamin G Johnson
William Ward
Maurice Colpron
William C McClelland
Francis A Macdonald
Resource Type: Book chapter
Publication Details: Circum-Arctic Structural Events: Tectonic Evolution of the Arctic Margins and Trans-Arctic Links with Adjacent Orogens, pp.573-592
Series: GSA Special Papers; 541
DOI: 10.1130/2018.2541(24)
ISSN: 0072-1077
Publisher: The_Geological_Society_of_America
Language: English
Date published: 06/14/2019
Academic Unit: Earth and Environmental Sciences
Record Identifier: 9984229164302771

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