Article ; Online: Marine oxygen production and open water supported an active nitrogen cycle during the Marinoan Snowball Earth.
2017 Volume 8, Issue 1, Page(s) 1316
Abstract: ... regions of open marine water and active biologic productivity throughout one of the harshest glaciations ... a biologic cycle with nitrogen fixation, nitrification and denitrification. Our results indicate significant ... The Neoproterozoic Earth was punctuated by two low-latitude Snowball Earth glaciations. Models ...
| Abstract | The Neoproterozoic Earth was punctuated by two low-latitude Snowball Earth glaciations. Models permit oceans with either total ice cover or substantial areas of open water. Total ice cover would make an anoxic ocean likely, and would be a formidable barrier to biologic survival. However, there are no direct data constraining either the redox state of the ocean or marine biological productivity during the glacials. Here we present iron-speciation, redox-sensitive trace element, and nitrogen isotope data from a Neoproterozoic (Marinoan) glacial episode. Iron-speciation indicates deeper waters were anoxic and Fe-rich, while trace element concentrations indicate surface waters were in contact with an oxygenated atmosphere. Furthermore, synglacial sedimentary nitrogen is isotopically heavier than the modern atmosphere, requiring a biologic cycle with nitrogen fixation, nitrification and denitrification. Our results indicate significant regions of open marine water and active biologic productivity throughout one of the harshest glaciations in Earth history. |
|---|---|
| Language | English |
| Publishing date | 2017-11-06 |
| Publishing country | England |
| Document type | Journal Article ; Research Support, Non-U.S. Gov't |
| ZDB-ID | 2553671-0 |
| ISSN | 2041-1723 ; 2041-1723 |
| ISSN (online) | 2041-1723 |
| ISSN | 2041-1723 |
| DOI | 10.1038/s41467-017-01453-z |
| Database | MEDical Literature Analysis and Retrieval System OnLINE |
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