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A Neoproterozoic Snowball Earth

Hoffman, Paul F. ; Kaufman, Alan J. ; Halverson, Galen P. ; Schrag, Daniel P.

Science (American Association for the Advancement of Science), 1998-08, Vol.281 (5381), p.1342-1346 [Periódico revisado por pares]

Washington, DC: American Society for the Advancement of Science

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Título:
A Neoproterozoic Snowball Earth
Autor: Hoffman, Paul F. ; Kaufman, Alan J. ; Halverson, Galen P. ; Schrag, Daniel P.
Assuntos: Age ; Atmosphere ; Atmospherics ; Carbon dioxide ; Carbonates ; Climate ; Earth ; Earth sciences ; Earth's age ; Earth, ocean, space ; Exact sciences and technology ; Geology ; Glacial deposits ; Glacial epoch ; Glacial landforms ; Glaciation ; Ice ages ; Marine ; Oceans ; Petrology of sedimentary rocks except quaternary rocks ; Prehistoric era ; Sedimentary rocks ; Snowball Earth hypothesis
É parte de: Science (American Association for the Advancement of Science), 1998-08, Vol.281 (5381), p.1342-1346
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Descrição: Negative carbon isotope anomalies in carbonate rocks bracketing Neoproterozoic glacial deposits in Namibia, combined with estimates of thermal subsidence history, suggest that biological productivity in the surface ocean collapsed for millions of years. This collapse can be explained by a global glaciation (that is, a snowball Earth), which ended abruptly when subaerial volcanic outgassing raised atmospheric carbon dioxide to about 350 times the modern level. The rapid termination would have resulted in a warming of the snowball Earth to extreme greenhouse conditions. The transfer of atmospheric carbon dioxide to the ocean would result in the rapid precipitation of calcium carbonate in warm surface waters, producing the cap carbonate rocks observed globally.
Editor: Washington, DC: American Society for the Advancement of Science
Idioma: Inglês

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A Neoproterozoic Snowball Earth

Hoffman, Paul F. ; Kaufman, Alan J. ; Halverson, Galen P. ; Schrag, Daniel P.

Washington, DC: American Society for the Advancement of Science

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