期刊
GEOPHYSICAL RESEARCH LETTERS
卷 44, 期 22, 页码 11376-11381出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2017GL075283
关键词
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资金
- NSF grant [EAR-1447311, EAR-1321956, EAR-1551348]
- National Science Foundation-Earth Sciences [EAR-1128799]
- Department of Energy-GeoSciences [DE-FG02-94ER14466]
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
- Carnegie Fellowship
- Division Of Earth Sciences
- Directorate For Geosciences [1551348] Funding Source: National Science Foundation
The origin of Earth's ancient magnetic field is an outstanding problem. It has recently been proposed that exsolution of MgO from the core may provide sufficient energy to drive an early geodynamo. Here we present new experiments on Mg partitioning between iron-rich liquids and silicate/oxide melts. Our results indicate that Mg partitioning depends strongly on the oxygen content in the iron-rich liquid, in contrast to previous findings that it depends only on temperature. Consequently, MgO exsolution during core cooling is drastically reduced and insufficient to drive an early geodynamo alone. Using the new experimental data, our thermal model predicts inner core nucleation at similar to 850 Ma and a nearly constant paleointensity.
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