Lancaster EPrints

Stretching the envelope of past surface environments : Neoproterozoic glacial lakes from Svalbard.

Bao, Huiming and Fairchild, Ian J. and Wynn, Peter M. and Spotl, Christoph (2009) Stretching the envelope of past surface environments : Neoproterozoic glacial lakes from Svalbard. Science, 323 (5910). pp. 119-122. ISSN 0036-8075

[img]
Preview
PDF (Stretching_the_envelope_of_past_surface_environments_e-prints.pdf)
Download (335Kb) | Preview

    Abstract

    The oxygen isotope composition of terrestrial sulfate is affected measurably by many Earth- surface processes. During the Neoproterozoic, severe " snowball" glaciations would have had an extreme impact on the biosphere and the atmosphere. Here, we report that sulfate extracted from carbonate lenses within a Neoproterozoic glacial diamictite suite from Svalbard, with an age of similar to 635 million years ago, falls well outside the currently known natural range of triple oxygen isotope compositions and indicates that the atmosphere had either an exceptionally high atmospheric carbon dioxide concentration or an utterly unfamiliar oxygen cycle during deposition of the diamictites.

    Item Type: Article
    Journal or Publication Title: Science
    Uncontrolled Keywords: OLIGOCENE ASH BED ; TILLITE ASSOCIATION ; PYRITE OXIDATION ; ISOTOPIC-RATIOS ; OXYGEN-ISOTOPE ; SNOWBALL EARTH ; CO2 LEVELS ; SULFATE ; SULFUR ; SPITSBERGEN
    Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
    Departments: UNSPECIFIED
    ID Code: 28101
    Deposited By: Dr. Peter Wynn
    Deposited On: 10 Nov 2009 09:00
    Refereed?: Yes
    Published?: Published
    Last Modified: 23 Jul 2014 14:49
    Identification Number:
    URI: http://eprints.lancs.ac.uk/id/eprint/28101

    Actions (login required)

    View Item