High obliquity as an alternative hypothesis to early and late proterozoic extreme climate conditions

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Climate model simulations are used to assess the high obliquity hypothesis as a solution to Palaeoproterozoic and Neoproterozoic low-latitude glacial conditions. Climate model simulations show that if a low-latitude land mass is assembled it can explain the Paleoproterozoic glacial deposits. In the Neoproterozoic, the High Obliq-uity hypothesis can explain the Sturtian low-latitude glacial deposits when the super-continent Rodinia was located in low-latitudes. The High Obliquity hypothesis cannot explain Varangian high-latitude glacial deposits because of the high amounts of incident solar radiation, which will not allow for the accumulation of snow. However the high-latitude Varangian glacial deposits are the least reliable and should be viewed with caution. Moreover, if the majority of glacial deposits are in low-latitudes in support of the high obliquity hypothesis it is possible that local environmental con-ditions such as elevated topography may have been responsible for high latitude glacial deposits. The most problematic issue for high obliquity is the mechanism responsible for significantly reducing obliquity on a 100-million year time-scale.

Original languageEnglish (US)
Title of host publicationThe Extreme Proterozoic
Subtitle of host publicationGeology, Geochemistry, and Climate, 2004
PublisherBlackwell Publishing Ltd.
Number of pages10
ISBN (Electronic)9781118666289
ISBN (Print)9780875904115
StatePublished - Jan 1 2004

Publication series

NameGeophysical Monograph Series
ISSN (Print)0065-8448
ISSN (Electronic)2328-8779

All Science Journal Classification (ASJC) codes

  • Geophysics


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