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      The Sr, C and O isotopic evolution of Neoproterozoic seawater

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      Chemical Geology

      Elsevier BV

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          A neoproterozoic snowball earth

          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.
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            Variation of seawater 87Sr/86Sr throughout Phanerozoic time

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              87Sr/86Sr, δ13C and δ18O evolution of Phanerozoic seawater

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                Author and article information

                Journal
                Chemical Geology
                Chemical Geology
                Elsevier BV
                00092541
                September 1999
                September 1999
                : 161
                : 1-3
                : 37-57
                Article
                10.1016/S0009-2541(99)00080-7
                © 1999

                http://www.elsevier.com/tdm/userlicense/1.0/

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