publication . Article . 2012

Zn isotope evidence for immediate resumption of primary productivity after snowball Earth

Marcus Kunzmann; Galen P. Halverson; Paolo A. Sossi; Timothy D. Raub; Justin L. Payne; Jason K. Kirby;
English
  • Published: 03 Oct 2012
  • Publisher: United States : Geological Society of America
  • Country: Australia
Abstract
The Ediacaran period began with the deglaciation of the ca. 635 Ma Marinoan snowball Earth and the deposition of cap dolostones on continental shelves worldwide during post-glacial sea-level rise. These carbonates sharply overlie glacial sediments deposited at low pale-olatitudes and preserve negative carbon isotope excursions. The snowball Earth hypothesis invokes an almost complete cessation of primary productivity in the surface ocean. Because assimilatory uptake of Zn appears to fractionate its isotopes, Zn isotope ratios measured in carbonate precipitated in the surface ocean should track fluctuations in primary productivity. Here we report the first Zn iso...
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free text keywords: Zn isotope, ediacaran period, Geology, Carbonate, chemistry.chemical_compound, chemistry, Isotopes of carbon, Continental shelf, geography.geographical_feature_category, geography, Deglaciation, Deposition (chemistry), Geology, Geochemistry, Snowball Earth, Biological pump, Oceanography, Dolostone
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Geology
Article . 2012
Provider: Crossref
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