The composition of the lunar crust provides key in- formation on the petrological evolution of the Moon. Studies mostly based on analyses of Apollo samples revealed the presence of two main groups of rocks [1]: i) Ferroan Anorthosites (FAN), characterized by >90% high-An plagioclase and mafic minerals with Mg# = Mg/(Mg + Fe) < 75, and ii) Mg-suite, characterised by plagioclase with decreasing anorthite content (An97-85), coupled with high, yet decreasing, Mg# (90-65). The presence of these two well defined groups represents one of the main evidence supporting the the Lunar Magma Ocean hypothesis [2]. Data from lunar meteor- ites, which may better represent the compositional and mineralogical variability of the lunar surface, have shown the presence of a more widespread composi- tional range leading to a reevaluation of the Lunar Magma Ocean model [3]. However, the “pristine” character of lunar meteorites has been questioned as they may represent impact-mixtures [4].
PETRO-MINERALOGICAL AND GEOCHEMICAL STUDY OF LUNAR METEORITE NWA 13859 / R. Avanzinelli, M. Casalini, T. Cuppone, G. Pratesi, A. Langone, C. Carli, F. Tosi. - ELETTRONICO. - (2023), pp. 0-0. (Intervento presentato al convegno XVIII CONGRESSO NAZIONALE DI SCIENZE PLANETARIE).
PETRO-MINERALOGICAL AND GEOCHEMICAL STUDY OF LUNAR METEORITE NWA 13859
R. Avanzinelli;M. Casalini;T. Cuppone;G. Pratesi;
2023
Abstract
The composition of the lunar crust provides key in- formation on the petrological evolution of the Moon. Studies mostly based on analyses of Apollo samples revealed the presence of two main groups of rocks [1]: i) Ferroan Anorthosites (FAN), characterized by >90% high-An plagioclase and mafic minerals with Mg# = Mg/(Mg + Fe) < 75, and ii) Mg-suite, characterised by plagioclase with decreasing anorthite content (An97-85), coupled with high, yet decreasing, Mg# (90-65). The presence of these two well defined groups represents one of the main evidence supporting the the Lunar Magma Ocean hypothesis [2]. Data from lunar meteor- ites, which may better represent the compositional and mineralogical variability of the lunar surface, have shown the presence of a more widespread composi- tional range leading to a reevaluation of the Lunar Magma Ocean model [3]. However, the “pristine” character of lunar meteorites has been questioned as they may represent impact-mixtures [4].File | Dimensione | Formato | |
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