Article (Scientific journals)
Crystallization of the lunar magma ocean and the primordial mantle-crust differentiation of the Moon
Charlier, Bernard; Grove, T. L.; Namur, Olivier et al.
2018In Geochimica et Cosmochimica Acta, 234, p. 50-69
Peer Reviewed verified by ORBi
 

Files


Full Text
Charlier et al 2018 LMO.pdf
Publisher postprint (1.82 MB)
Download

All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
Anorthosite; Experimental petrology; Liquid line of descent; Lunar crust; Mantle; Phase equilibria
Abstract :
[en] We present crystallization experiments on silicate melt compositions related to the lunar magma ocean (LMO) and its evolution with cooling. Our approach aims at constraining the primordial internal differentiation of the Moon into mantle and crust. We used graphite capsules in piston cylinder (1.35–0.80 GPa) and internally-heated pressure vessels (<0.50 GPa), over 1580–1020 °C, and produced melt compositions using a stepwise approach that reproduces fractional crystallization. Using our new experimental dataset, we define phase equilibria and equations predicting the saturation of liquidus phases, magma temperature, and crystal/melt partitioning for major elements relevant for the crystallization of the LMO. These empirical expressions are then used in a forward model that predicts the liquid line of descent and crystallization products of a 600 km-thick magma ocean. Our results show that the effects of changes in the bulk composition on the sequence of crystallization are minor. Our experiments also show the crystallization of a silica phase at ca. 1080 °C and we suggest that this phase might have contributed to the building of the lower anorthositic crust. Calculation of crustal thickness clearly shows that a thin crust similar to that revealed by GRAIL cannot have been generated through solidification of whole Moon magma ocean. We discuss the role of magma ocean depth, trapped liquid fraction (with implication for the alumina budget in the mantle and the crust), and the efficiency of plagioclase flotation in producing the thin crust. We also constrain the potential range of pyroxene compositions that could be incorporated into the crust and show that delayed crustal building during ca. 4% LMO crystallization on the nearside of the Moon may explain the dichotomy for Mg-number. Finally, we show that the LMO can produce magnesian anorthosites during the first stages of plagioclase crystallization. © 2018 Elsevier Ltd
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Charlier, Bernard  ;  Université de Liège - ULiège > Département de géologie > Pétrologie, géochimie endogènes et pétrophysique
Grove, T. L.;  Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, Cambridge, MA 02139, United States
Namur, Olivier ;  Université de Liège - ULiège > Département de géologie > Pétrologie, géochimie endogènes et pétrophysique
Holtz, F.;  Institut für Mineralogie, Leibniz Universität Hannover, Hannover, 30167, Germany
Language :
English
Title :
Crystallization of the lunar magma ocean and the primordial mantle-crust differentiation of the Moon
Publication date :
2018
Journal title :
Geochimica et Cosmochimica Acta
ISSN :
0016-7037
eISSN :
1872-9533
Publisher :
Elsevier, United Kingdom
Volume :
234
Pages :
50-69
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 15 October 2019

Statistics


Number of views
54 (1 by ULiège)
Number of downloads
577 (5 by ULiège)

Scopus citations®
 
90
Scopus citations®
without self-citations
88
OpenCitations
 
73

Bibliography


Similar publications



Contact ORBi