|Title:||New geochemical models of core formation in the Moon from metal-silicate partitioning of 15 siderophile elements|
van Westrenen W.
|Published in:||Earth and Planetary Science Letters|
|Abstract:||We re-examine the conditions at which core formation in the Moon may have occurred by linking the observed lunar mantle depletions of 15 siderophile elements, including volatile siderophile elements (VSE) to predictive equations derived from a database compilation of metal-silicate partition coefficients obtained at lunar-relevant pressure-temperature-oxygen fugacity (P-T-fO2) conditions.Our results suggest that at mantle temperatures between the solidus and liquidus the depletions for all elements considered can be satisfied, but only if the Moon was essentially fully molten at the time of core formation while assuming a S-rich (>8 wt%) core comprising 2.5 wt% of the mass of the Moon. However, we observe that at temperatures exceeding the mantle liquidus, with increasing temperature the core S content required to satisfy the element depletions is reduced. As a S-poor core is likely from recent lunar mantle estimates of S abundance, this suggests much higher temperatures during lunar core formation than previously proposed.We conclude that the VSE depletions in the lunar mantle can be solely explained by core formation depletion, suggesting that no significant devolatilization has occurred in later periods of lunar evolution. This is in agreement with the discovery of significant amounts of other volatiles in the lunar interior, but hard to reconcile with current lunar formation models. © 2016 Elsevier B.V.|
|Citation:||Earth and Planetary Science Letters (2016), 441(): 1-9|
|Author Scopus IDs:||57097521600|
|Author Affiliations:||Steenstra, E.S., Faculty of Earth and Life Sciences, VU University Amsterdam, Amsterdam, Netherlands|
Rai, N., Centre for Planetary Sciences, Birkbeck - UCL, London, United Kingdom, Department of Earth Sciences, Mineral and Planetary Sciences Division, Natural History Museum, London, United Kingdom
Knibbe, J.S., Faculty of Earth and Life Sciences, VU University Amsterdam, Amsterdam, Netherlands
Lin, Y.H., Faculty of Earth and Life Sciences, VU University Amsterdam, Amsterdam, Netherlands
van Westrenen, W., Faculty of Earth and Life Sciences, VU University Amsterdam, Amsterdam, Netherlands
|Funding Details:||This study was funded by a Netherlands Organisation for Scientific Research (N.W.O.) Vici grant to WvW. We would like to thank PSI for financial support through the Pierazzo International Student Travel Award awarded to ESS. This paper greatly benefited from reviews by N. Chabot and an anonymous reviewer, and the editorial handling of J. Brodholt. Appendix A|
|Corresponding Author:||Steenstra, E.S.; Faculty of Earth and Life Sciences, VU University AmsterdamNetherlands; email: firstname.lastname@example.org|
|Appears in Collections:||Journal Publications [ES]|
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