| Type |
Article |
| Date |
2005-02 |
| Language |
English |
| Author(s) |
Rouxel Olivier , Bekker A, Edwards Kj |
| Affiliation(s) |
Woods Hole Oceanog Inst, Marine Chem & Geochem Dept, Geomicrobiol Grp, Woods Hole, MA 02543 USA.
Carnegie Inst Washington, Geophys Lab, Washington, DC 20015 USA. |
| Source |
Science (0036-8075) (Amer Assoc Advancement Science), 2005-02 , Vol. 307 , N. 5712 , P. 1088-1091 |
| DOI |
10.1126/science.1105692 |
| WOS© Times Cited |
357 |
| Abstract |
The response of the ocean redox state to the rise of atmospheric oxygen about 2.3 billion years ago (Ga) is a matter of controversy. Here we provide iron isotope evidence that the change in the ocean iron cycle occurred at the same time as the change in the atmospheric redox state. Variable and negative iron isotope values in pyrites older than about 2.3 Ga suggest that an iron-rich global ocean was strongly affected by the deposition of iron oxides. Between 2.3 and 1.8 Ga, positive iron isotope values of pyrite likely reflect an increase in the precipitation of iron sulfides relative to iron oxides in a redox stratified ocean. |
| Full Text |
| File |
Pages |
Size |
Access |
|
4 |
114 KB |
Access on demand |
| Author's final draft |
40 |
214 KB |
Open access |
|
