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Metal-silicate partitioning of highly siderophile elements in S-bearing systems- Implications for the formation of Earth’s core
| Content Provider | Semantic Scholar |
|---|---|
| Author | Laurenz, Vera Rubie, David. C. Frost, Daniel J. |
| Copyright Year | 2014 |
| Abstract | The segregation of Fe-rich metal to form the Earth’s core led to a strong depletion of the in highly siderophile elements (HSEs) in the Earth’s mantle. From experimental work in S-free systems it is known, that the HSEs should be highly fractionated in the Earth’s mantle [1]. However, the HSEs are thought to be present in roughly chondritic proportions [2]. A possible key to this contradiction might be related to sulfur, which was added late during Earth’s accretion. Hence, the core-forming metal became more S-rich, which should have a strong effect on the behaviour of the HSEs [3]. Therefore, we studied the partitioning of Pt, Pd, Ru and Ir between a molten peridotite and a S-bearing Fe-HSE alloy or sulfide (0-35 wt.% S). Experiments were carried out at 2200 °C and 11-21 GPa in a multianvil apparatus. Overall, the HSEs become less siderophile with increasing S-content. The individual HSEs are affected to varying degrees so that KD of Pt, Pd, Ru and Ir converge towards high S concentrations. These results imply that the HSEs can be extracted to the core by a late S-rich melt with only small inter-element fractionation, explaining the observed chondritic HSEratios found in the mantle. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.accrete.uni-bayreuth.de/workshop/Nice%20May%202014/Laurenz.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
