¹Dagmara Oszkiewicz,¹Hanna Klimczak,²Benoit Carry,³Antti Penttilä,⁴Marcel Popescu,¹Joachim Krüger,^5,6Marcelo Aron Keniger
Monthly Notices of the Royal Astronomical Society 519, 2917–2928 Link to Article[https://doi.org/10.1093/mnras/stac3442]
¹Astronomical Observatory Institute, Faculty of Physics, Adam Mickiewicz University, Słoneczna 36, P-60-286 Poznań, Poland
²Observatoire de la Côte d’Azur, CNRS, Université Côte d’Azur, Laboratoire Lagrange, 06304 Nice, France
³Department of Physics, University of Helsinki, P.O. Box 64, FI-00014 Helsinki, Finland
⁴Astronomical Institute of the Romanian Academy, 5 Cutitul de Argint, 040557 Bucharest, Romania
⁵Nordic Optical Telescope, Rambla José Ana Fernández Pérez 7, E-38711 Breña Baja, Spain
⁶Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark

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¹E. Hasenstab-Dübeler,¹C. Münker,¹J. Tusch,^1,2M.M. Thiemens,³ D. Garbe-Schönberg,⁴E. Strub,⁵P. Sprung
Earth and Planetary Science Letters 606, 118018 Link to Article [https://doi.org/10.1016/j.epsl.2023.118018]
¹Institut für Geologie und Mineralogie, Universität zu Köln, Köln, Germany
²Laboratoire G-Time, Département Géosciences, Environnement et Société, Université Libre de Bruxelles, Brussels, Belgium
³Institut für Geowissenschaften, Christian-Albrechts- Universität zu Kiel, 24118 Kiel, Germany
⁴Division of Nuclear Chemisty, University of Cologne, 50674 Cologne, Germany
⁵Hot Laboratory Division (AHL), Paul Scherrer Institut, Villigen, Switzerland
Copyright Elsevier

The Moon is a key example of a planetary body that originated from a giant impact collisional event. By better understanding its bulk composition, we gain critical constraints on the building blocks of the Earth-Moon system. Combined measurements of long-lived 147Sm-143Nd and short-lived 146Sm-142Nd isotope compositions of Earth and Moon have lead to controversial interpretations in the past and it remains ambiguous, whether or not the Moon is similar to primitive chondrites in its refractory lithophile element composition. We investigated coupled 138La-138Ce and 147Sm-143Nd isotope and trace element compositions across a wide range of lunar rock types to provide an independent assessment of the bulk Moon composition. All measured lunar rocks define a tight array in 138Ce-143Nd space, intersecting initial
at an initial εCe
, significantly lower than the currently accepted chondritic 138Ce reference value. The results of combined modeling of 138Ce-143Nd-176Hf isotope and trace element behavior during lunar magma ocean (LMO) crystallization are in good agreement with the bulk silicate Moon having a slight depletion in its highly incompatible trace element inventory. Our calculated composition of the silicate Moon evolves towards
and εNd =+1.4 at 3.30 Ga, the approximate age of most lunar samples investigated here. This proposed lunar isotope composition at 3.30 Ga agrees well with the intersection of the
Ga lunar array and the terrestrial array defined by rocks from the Archean Pilbara and the Kaapvaal Cratons. We take this as evidence that accessible silicate Earth and the Moon may share a common reservoir slightly depleted in highly incompatible trace elements, named here Slightly Depleted Earth-Moon reservoir (SDEM). The SDEM reservoir proposed here is generally in line with previous models claiming a depleted composition of the accessible silicate Earth, but the degree of depletion is significantly smaller than previously proposed.