Varanger glaciation: Difference between revisions
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#REDIRECT [[Cryogenian]] |
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The Varanger Glacial Event (sometimes termed the [[Stuartian-Varangian]] with [[Stuartian]] being the earlier part) was a world wide [[glaciation]] that occurred around 950-600 Million Years Ago. The population of [[acritarchs]] crashed during this glaciation and it is claimed that [[oxygen]] levels in the [[atmosphere]] increased after the glaciation. There are a number of enigmatic features with regard to this glaciation including indications of glaciation at very low latitudes and the presence of [[limestone]]s -- normally warm [[water]] sediments above, below and intermixed with glacial deposits. [[Paleomagnetism]] seems to indicate very high [[continental drift]] rates leading some geologists to question whether some of the phenomena might be due to [[magnetic pole]] wandering rather than plate motion and low [[latitiude]] glaciation. However, cabon isotope analysis indicates that several worldwide glaciations may have occurred. Evidence of the Varanger event is found in various places and times: The [[Congo]] from 950-750Ma and 620-600Ma. [[Australia]] from 800-780Ma and 690-680Ma. [[China]] 800-760Ma, 740-700Ma and 600Ma; Western [[North America]] 850-800Ma, [[Sahara]] 730-650Ma, [[Norway]] 650Ma. [[Spitzpergen]] 593-573Ma. Other known world wide glaciations include the [[Huronian]] from 2400Ma to 2100Ma, [[Andean-Saharan]] from 450-420Ma, the [[Karoo]] glaciation from 360Ma to 260Ma, and the [[Cenozoic]] glaciation which started 30Ma in [[Antarctica]] and may not be over. |
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Latest revision as of 16:12, 19 November 2024
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