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A Late Paleocene age for Greenland’s Hiawatha impact structure

Kenny, Gavin G. (author)
Swedish Museum of Natural History,Naturhistoriska riksmuseet,Enheten för geovetenskap,Department of Geosciences, Swedish Museum of Natural History, SE-104 05 Stockholm, Sweden.
Hyde, William R. (author)
Globe Institute, University of Copenhagen, Øster Voldgade 5-7, 1350 Copenhagen K, Denmark.
Storey, Michael (author)
Quadlab, Natural History Museum of Denmark, Øster Voldgade 5-7, 1350 Copenhagen K, Denmark.
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Garde, Adam A. (author)
Geological Survey of Denmark and Greenland, Øster Voldgade 10, 1350 Copenhagen K, Denmark.
Whitehouse, Martin J. (author)
Swedish Museum of Natural History,Naturhistoriska riksmuseet,Enheten för geovetenskap,Department of Geosciences, Swedish Museum of Natural History, SE-104 05 Stockholm, Sweden.
Beck, Pierre (author)
Univ. Grenoble Alpes, CNRS, IPAG, 38000 Grenoble, France.,University Grenoble Alpes
Johansson, Leif (author)
Lund University,Lunds universitet,Berggrundsgeologi,Geologiska institutionen,Naturvetenskapliga fakulteten,Lithosphere and Biosphere Science,Department of Geology,Faculty of Science
Søndergaard, Anne Sofie (author)
Department of Geoscience, Aarhus University, Høegh Guldbergs Gade 2, 8000 Aarhus, Denmark.;Laboratory for Ion Beam Physics, ETH Zürich, Otto-Stern-Weg 5, 8093 Zürich, Switzerland.
Bjørk, Anders A. (author)
Department of Geoscience and Natural Resource Management, University of Copenhagen, Øster Voldgade 10, 1350 Copenhagen K, Denmark.
MacGregor, Joseph A. (author)
Cryospheric Sciences Lab, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA.
Khan, Shfaqat A. (author)
Department of Geodesy, National Space Institute, Technical University,Technical University of Denmark
Mouginot, Jérémie (author)
of Denmark, Kongens Lyngby, Denmark.;Institut des Géosciences de l’Environnement, CNRS, Université Grenoble Alpes, Grenoble, France.,University of California, Irvine
Johnson, Brandon C. (author)
Department of Earth System Science, University of California, Irvine, Irvine, CA 92617, USA.;Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, IN 47907, USA.
Silber, Elizabeth A. (author)
Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907, USA.;Department of Earth Sciences, Western University, London, ON N6A 5B7, Canada.,University of Western Ontario
Wielandt, Daniel K. P. (author)
Quadlab, Natural History Museum of Denmark, Øster Voldgade 5-7, 1350 Copenhagen K, Denmark.
Kjær, Kurt H. (author)
Globe Institute, University of Copenhagen, Øster Voldgade 5-7, 1350 Copenhagen K, Denmark.
Larsen, Nicolaj K. (author)
Globe Institute, University of Copenhagen, Øster Voldgade 5-7, 1350 Copenhagen K, Denmark.
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 (creator_code:org_t)
American Association for the Advancement of Science (AAAS), 2022
2022
English.
In: Science Advances. - : American Association for the Advancement of Science (AAAS). - 2375-2548. ; 8:10
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • The ~31-km-wide Hiawatha structure, located beneath Hiawatha Glacier in northwestern Greenland, has been proposed as an impact structure that may have formed after the Pleistocene inception of the Greenland Ice Sheet. To date the structure, we conducted 40Ar/39Ar analyses on glaciofluvial sand and U-Pb analyses on zircon separated from glaciofluvial pebbles of impact melt rock, all sampled immediately downstream of Hiawatha Glacier. Unshocked zircon in the impact melt rocks dates to ~1915 million years (Ma), consistent with felsic intrusions found in local bedrock. The 40Ar/39Ar data indicate Late Paleocene resetting and shocked zircon dates to 57.99 ± 0.54 Ma, which we interpret as the impact age. Consequently, the Hiawatha impact structure far predates Pleistocene glaciation and is unrelated to either the Paleocene-Eocene Thermal Maximum or flood basalt volcanism in east Greenland. However, it was contemporaneous with the Paleocene Carbon Isotope Maximum, although the impact’s exact paleoenvironmental and climatic significance awaits further investigation.

Subject headings

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Geology (hsv//eng)

Keyword

The changing Earth
Den föränderliga jorden

Publication and Content Type

ref (subject category)
art (subject category)

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