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

By
Lyle L. Nelson
Lyle L. Nelson
Department of Earth and Planetary Sciences, Johns Hopkins University, 3400 N. Charles Street, Baltimore, Maryland 21218, USA
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Justin V. Strauss
Justin V. Strauss
Department of Earth Sciences, Dartmouth College, HB6105 Fairchild Hall, Hanover, New Hampshire 03755, USA
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Peter W. Crockford
Peter W. Crockford
Department of Earth and Planetary Sciences, Weizmann Institute of Science, Rehovot 76100, Israel
Department of Geosciences, Princeton University, Princeton, New Jersey 08544, USA
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Grant M. Cox
Grant M. Cox
Centre for Tectonics, Resources and Exploration (TraX), Department of Earth Sciences, The University of Adelaide, Adelaide, South Australia 5005, Australia
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Benjamin G. Johnson
Benjamin G. Johnson
Department of Geology and Geography, West Virginia University, 98 Beechurst Avenue, Morgantown, West Virginia 26506, USA
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William Ward
William Ward
Department of Earth and Environmental Sciences, University of Iowa, 115 Trowbridge Hall, Iowa City, Iowa 52242, USA
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Maurice Colpron
Maurice Colpron
Yukon Geological Survey, P.O. Box 2703 (K-14), Whitehorse, Yukon, Y1A 2C6, Canada
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William C. McClelland
William C. McClelland
Department of Earth and Environmental Sciences, University of Iowa, 115 Trowbridge Hall, Iowa City, Iowa 52242, USA
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Francis A. Macdonald
Francis A. Macdonald
Department of Earth Science, University of California, Santa Barbara, 1006 Webb Hall, Santa Barbara, California 93106, USA
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Publication history
24 April 201816 November 2018

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.

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Contents

GSA Special Papers

Circum-Arctic Structural Events: Tectonic Evolution of the Arctic Margins and Trans-Arctic Links with Adjacent Orogens

Geological Society of America
Volume
541
ISBN electronic:
9780813795416

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