The Moon-forming impact is thought to be the last giant collision event that Earth experienced, marking the end of Earth’s accretion process and setting the initial conditions for the subsequent thermochemical evolution of the Earth and the Moon. For both bodies, an early magma ocean is thought to have existed, as a consequence of giant impacts leading to widespread melting. As the geological record of the early evolution history is lacking on Earth only the Moon probably shows relicts of the crystallization of a global or partial magma ocean. The goal of this subproject is to understand how these magma oceans formed and crystallized and how they influenced the thermochemical and tectonic evolution of Earth and Moon. To this end, we aim to constrain the range of plausible thermal conditions after a giant collision that may have resulted in the formation of a global or partial magma ocean on Earth. We will employ well-established numerical models, and we will further develop and adjust them to allow us to simulate giant collisions as big as the Moon-forming event. Using the thermal setting from impact modelling as our input for subsequent detailed fluid and thermodynamical modelling, we intend to quantify dynamics, crystallization, and degassing of a magma ocean in order to constrain the resulting density and temperature profiles and volatile distribution. We will use these models to derive parameterizations, with the help of which we will study the thermochemical evolution of the Moon after its formation, including the phase in which the lunar magma ocean evolved. With these models for both the Earth and the Moon, we will define the thermochemical condition at the time of the late veneer on both bodies. In the end, this subproject aims at providing a model that is consistent with the geochemical signature of the Earth and the Moon.
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Yu, S., Tosi, N., Schwinger, S., Maurice, S., Breuer, D., Xiao, L., 2019: Overturn of ilmenite-bearing cumulates in a rheologically-weak lunar interior. JGR Planets. 10.1029/2018JE005739
Neumann, W., Kruijer, T. S., Breuer, D., Kleine, T., 2018: Multi-stage core formation in planetesimals revealed by numerical modelling and Hf-W chronometry of iron meteorites. Journal of Geophysical Research: Planets, Vol. 123(2), pp. 421-444. 10.1002/2017JE005411
Ruedas, T. and D. Breuer, 2018: Isocrater” impacts: Conditions and mantle dynamical responses for different impactor types. Icarus, Vol. 306, pp. 94-115. 10.1016/j.icarus.2018.02.005
Neumann, W., Henke, S., Breuer, D., Gail, H.-P., Schwarz, W. H., Trieloff, M., Hopp, J., Spohn, T., 2018: Modeling the evolution of the parent body of acapulcoites and lodranites: A case study for partially differentiated asteroids. Icarus, Vol. 311, pp. 146 169. 10.1016/j.icarus.2018.03.024
Ruedas, T. and D. Breuer, 2017: On the relative importance of thermal and chemical buoyancy in regular and impact-induced melting in a Mars-like planet; Journal of Geophysical Research - Planets, Vol. 122(7), pp. 1554-1579. 10.1002/2016JE005221
Maurice, M., Tosi, N., Samuel, H., Plesa, A. C., Hüttig, C., Breuer, D., 2017: Onset of solid-state mantle convection and mixing during magma ocean solidification, Journal of Geophysical Research: Planets Vol. 122(3). 10.1002/2016JE005250