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    A palaeogeographic context for Neoproterozoic glaciation

    133205_Li.pdf (4.450Mb)
    Access Status
    Open access
    Authors
    Hoffman, P.
    Li, Zheng-Xiang
    Date
    2009
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Hoffman, Paul and Li, Zheng-Xiang. 2009. A palaeogeographic context for Neoproterozoic glaciation. Palaeogeography, Palaeoclimatology, Palaeoecology. 277 (3-4): pp. 158-172.
    Source Title
    Palaeogeography, Palaeoclimatology, Palaeoecology
    DOI
    10.1016/j.palaeo.2009.03.013
    ISSN
    00310182
    Faculty
    Department of Applied Geology
    Faculty of Science and Engineering
    WA School of Mines
    Remarks

    The link to the journal’s home page is: http://www.elsevier.com/wps/find/journaldescription.cws_home/503355/description#description. Copyright © 2009 Elsevier B.V. All rights reserved

    URI
    http://hdl.handle.net/20.500.11937/5154
    Collection
    • Curtin Research Publications
    Abstract

    The distributions of 77 Neoproterozoic glacigenic formations are shown on global palaeogeographic maps for 715 Ma (Sturtian), 635 Ma (Marinoan) and 580 Ma (Ediacaran), constructed on grounds independent of palaeoclimatic indicators. The meridional distribution of Sturtian and Marinoan deposits is biased in favour of low palaeolatitudes, whereas Ediacaran deposits are biased in favour of high palaeolatitudes. All carbonate hosted glacigenic formations (n=22) fall within 35 of the palaeoequator. Most (6 of 8) examples of periglacial polygonal sand-wedges occur at palaeolatitudes greater than 30, whereas most (8 of 9) occurrences of large syn-glacial Fe and Fe-Mn deposits lie within 30 of the palaeoequator. Marinoan syndeglacial cap dolostones (n=24) decline in maximum thickness with palaeolatitude, consistent with poleward ice retreat, normal meridional temperature gradients and a small-obliquity orbit. Meridional (N-S) mean orientations of giant wave ripples in Marinoan cap dolostones from different regions (n=10) and absence of zonal (W-E) orientations are consistent with zonal wind-driven waves and not with hurricanes. In general, the results support the validity of the palaeogeographic reconstructions and the pan-glacial character of Sturtian and Marinoan ice ages.

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