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A re-evaluation of the Hart Ash, an important stratigraphic marker: Wright Valley, Antarctica

Published online by Cambridge University Press:  26 April 2019

M. Schiller ,
W.W. Dickinson ,
N.A. Iverson  and
J.A. Baker
M. Schiller
Affiliation:
Centre for Star and Planet Formation, Natural History Museum of Denmark, University of Copenhagen, Copenhagen DK-1350, Denmark
W.W. Dickinson*
Affiliation:
Antarctic Research Centre, Victoria University of Wellington, PO Box 600, Wellington, New Zealand
N.A. Iverson
Affiliation:
New Mexico Bureau of Geology and Mineral Resources, New Mexico Institute of Mining and Technology, Socorro, NM 87801, USA
J.A. Baker
Affiliation:
School of Environment, University of Auckland, Private Bag 92019, Auckland, New Zealand
*
*Corresponding author: [email protected]
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Abstract

Reliably dated surficial deposits for reconstructing palaeoclimate are rare in the McMurdo Dry Valleys of Antarctica. While many tephra have been found and dated, none is well characterized. In the Wright Valley, the Hart Ash is poorly dated and described. This paper reports profiles through tephra, the chemical signature of the glass shards and new high-precision multi-crystal laser fusion of 40Ar/39Ar ages. Major and trace element analyses of glass shards indicate the tephra are phonolitic and most probably sourced from Mount Discovery in the Erebus volcanic province. Two chemically distinct and stratigraphically separate tephra layers within the Hart Ash were found in three closely spaced soil profiles. The complex stratigraphy between these profiles could not be delineated without the geochemistry of the tephra. Importantly, our data suggest that only one tephra may be an in situ fall-out deposit, which gave a robust age of 2.97 ± 0.02 Ma. This new age for the Hart Ash tephra, which is 10 cm thick and is preserved at the current surface, provides a maximum age for surface deposits in the lower Wright Valley. This study highlights that well-characterized tephra enhance stratigraphic correlations in the Dry Valleys and improve the accuracy of palaeoenvironmental interpretations.

Keywords

McMurdo Dry ValleyspalaeoenvironmentalPliocenestratigraphytephra
Type
Earth Sciences
Information
Antarctic Science , Volume 31 , Issue 3 , June 2019 , pp. 139 - 149
Copyright
Copyright © Antarctic Science Ltd 2019 

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References

Blott, S. & Pye, K. 2001. Gradistat: a grain size distribution and statistics package for the analysis of unconsolidated sediments. Earth Surface Processes and Landforms, 26, 1237–1248.Google Scholar
Claridge, G. & Campbell, I.B. 2008. Zeolites in Antarctic soils: examples from Coombs Hills and Marble Point. Geoderma, 144, 66–72.Google Scholar
Cox, S.C., Turnbull, I.M., Isaac, M.J., Townsend, D. & Smith, L.B. 2012. Geology of the southern Victoria Land, Antarctica. 1:250 000 geological map 22. Lower Hutt: Institute of Geological and Nuclear Sciences.Google Scholar
Hall, B.L. 1992. Surficial geology and geomorphology of eastern Wright Valley, Antarctica: implications for Plio–Pleistocene ice - sheet dynamics. MSc thesis, University of Maine [Unpublished].Google Scholar
Hall, B.L., Denton, G.H., Lux, D.R. & Bockheim, J.G. 1993. Late Tertiary Antarctic Palaeoclimate and ice-sheet dynamics inferred from surficial deposits in Wright Valley. Geografiska Annaler, 75A, 239–267.Google Scholar
Koyaguchi, T. 1994. Grain-size variation of tephra derived from volcanic umbrella clouds. Bulletin of Volcanology, 56, 1–9.Google Scholar
Kuiper, K.F., Deino, A., Hilgen, F.J., Krijgsman, W., Renne, P.R. & Wijbrans, J.R. 2008. Synchronizing rock clocks of Earth history. Science, 320, 10.1126/science.1154339.Google Scholar
Kyle, P.R. 1990. McMurdo Volcanic Group Western Ross embayment: introduction. Antarctic Research Series, 48, 18–25.Google Scholar
Levy, R., Cody, R., Crampton, J., Fielding, C., Golledge, N., Harwood, D., et al. 2012. Late Neogene climate and glacial history of the southern Victoria Land coast from integrated drill core, seismic and outcrop data. Global and Planetary Change, 80–81, 61–84.Google Scholar
Lewis, A.R. & Ashworth, A.C. 2016. An early to middle Miocene record of ice-sheet and landscape evolution from the Friis Hills, Antarctica. Geological Society of America Bulletin, 128, 10.1130/B31319.1.Google Scholar
Lewis, A.R., Marchant, D.R., Baldwin, S.L. & Webb, L.E. 2006. The age and origin of the Labyrinth, western Dry Valleys, Antarctica: evidence for extensive middle Miocene subglacial floods and freshwater discharge to the Southern Ocean. Geology, 34, 513–516.Google Scholar
Liu, E.J., Cashman, K.V., Beckett, F.M., Witham, C.S., Leadbetter, S.J., Hort, M.C. & Guðmundsson, S. 2014. Ash mists and brown snow: remobilization of volcanic ash from recent Icelandic eruptions. Journal of Geophysical Research Atmospheres, 119, 10.1002/2014JD021598Google Scholar
Marchant, D.R. & Denton, G.H. 1996. Miocene and Pliocene paleoclimate of the Dry Valleys region, southern Victoria land: a geomorphological approach. Marine Micropaleontology, 27, 253–271.Google Scholar
Marchant, D.R., Denton, G.H., Sugden, D.E. & Swisher, C.C.I. 1993a. Miocene glacial stratigraphy and landscape evolution of the western Asgard Range, Antarctica. Geografiska Annaler, 75A, 303–330.Google Scholar
Marchant, D.R., Denton, G.H., Swisher, C.C.I. & Potter, N.J. 1996. Late Cenozoic Antarctic paleoclimate reconstructed from volcanic ashes in the dry valleys region of southern Victoria Land. Geological Society of America Bulletin, 108, 181–194.Google Scholar
Marchant, D.R., Mackay, S.L., Lamp, J.L., Hayden, A.T. & Head, J.W. 2013. A review of geomorphic processes and landforms in the Dry Valleys of southern Victoria Land: implications for evaluating climate change and ice-sheet stability. Special Publication of the Geological Society of London, No. 381, 10.1144/SP381.10.Google Scholar
Marchant, D.R., Swisher, C.C.I., Lux, D.R., West, D.J. & Denton, G.H. 1993b. Pliocene paleoclimate and East Antarctic ice sheet history from surficial ash deposits. Science, 260, 667–670.Google Scholar
Martin, A.P., Cooper, A.F. & Dunlap, J.W. 2010. Geochronology of Mount Morning, Antarctica: two-phase evolution of a long-lived trachyte–basanite–phonolite eruptive center. Bulletin of Volcanology, 72, 357–371.Google Scholar
McKay, R., Browne, G., Carter, L., Cowan, E., Dunbar, G., Krissek, L., et al. 2009. The stratigraphic signature of the late Cenozoic Antarctic ice sheets in the Ross Embayment. Geologic Society of America Bulletin, 121, 1537–1561.Google Scholar
Morgan, D.J., Putkonen, J., Balco, G. & Stone, J.O. 2010. Quantifying regolith erosion rates with cosmogenic nuclides 10Be and 26Al in the McMurdo Dry Valleys. Antarctica Journal of Geophysical Research, 115, 10.1029/2009JF001443.Google Scholar
Panter, K., Kyle, P. & Smellie, J. 1997. Petrogenesis of a phonolite–trachyte succession at Mount Sidley, Marie Byrd Land. Antarctica Journal of Petrology, 38, 1225–1253.Google Scholar
Prentice, M.L., Bockheim, J.G., Wilson, S.C., Burckle, L.H., Hodell, D.A., Schlucher, C. & Kellogg, D.E. 1993. Late Neogene Antarctic glacial history: evidence from central Wright Valley. Antarctic Research Series, 60, 207–250.Google Scholar
Prentice, M.L. & Krusic, A.G. 2005. Early Pliocene alpine glaciation in Antarctica: terrestrial versus tidewater glaciers in Wright Valley Geografiska Annaler, 87A, 87–109.Google Scholar
Pyle, D. 1989. The thickness, volume and grainsize of tephra fall deposits. Bulletin of Volcanology, 51, 1–15.Google Scholar
Ross, J.I., McIntosh, W.C. & Dunbar, N.W. 2012. Development of a precise and accurate age-depth model based on 40Ar/39Ar dating of volcanic material in the ANDRILL (1B) drill core, southern McMurdo. Sound Global and Planetary Change, 96–97, 118–130.Google Scholar
Ross, J.R. 2014. Geochronology of southern McMurdo Sound and development of Pychron: a 40Ar/39Ar data collection and processing software suite. PhD thesis, New Mexico Institute of Mining and Technology [Unpublished].Google Scholar
Schiller, M. 2007. Testing the antiquity of McMurdo Dry Valley soil surfaces with atmospheric 10Be. MSc thesis, Victoria University of Wellington [Unpublished].Google Scholar
Schiller, M., Dickinson, W.W., Ditchburn, R.G., Graham, I.J. & Zondervan, A. 2009. Atmospheric 10Be in an Antarctic soil: implications for climate change. Journal of Geophysical Research, 114, 01010.01029/02008JF001052.Google Scholar
Sugden, D.E., Marchant, D.R., Potter, N.J., Souchez, R.A., Denton, G.H., Swisher, C.C.I. & Tison, J.-L. 1995. Preservation of Miocene glacier ice in East Antarctica. Nature, 376, 412–414.Google Scholar
Watt, S.F.L., Pyle, D.M., Mather, T.A., Martin, R.S. & Matthews, N.E. 2009. Fallout and distribution of volcanic ash over Argentina following the May 2008 explosive eruption of Chaitén, Chile. Journal of Geophysical Research, 114, B04207.Google Scholar
Wiesner, M., Wetzel, A., Catane, S., Listanco, E. & Mirabueno, H. 2004. Grain size, areal thickness distribution and controls on sedimentation of the 1991 Mount Pinatubo tephra layer in the South China Sea. Bulletin of Volcanology, 66, 226–242.Google Scholar
Wright, A.C. 1987. Volcanic geology, mineralogy, and petrogenesis of the Discovery Volcanic Subprovince, southern Victoria Land, Antarctica. PhD thesis, New Mexico Institute of Mining and Technology [Unpublished].Google Scholar
Wright, A.C. & Kyle, P.R. 1990. Mount Discovery. Antarctic Research Series, 48, 120–123.Google Scholar
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