The NASA’s MESSENGER mission reported that Mercury surface is mainly composed of basaltic lavas, with small areas composed of residual floating carbon phases due to a primordial magma ocean. In particular, compositional data obtained by X- and Gamma-ray spectrometers highlighted that basaltic lavas have unique characteristics among the differentiated planetary bodies (e.g., Solomon et al., 2018). Mercurian rocks appears to be extremely reduced, with very low Fe contents (< 2 wt.% Fe; with Fe/Si of ~0.06), an enrichment in Na and K, a wide variability of Mg and Ca, and a significant abundance of S (1.5-4 wt.%; e.g., Rothery et al., 2020). The composition of Mercury surface is so unique that we still do not have any terrestrial or extraterrestrial analogue. Only a few enstatite achondrites meteorites, the aubrites, have features that could, in part, resemble that of the Mercurian surface. Aubrites are primarily composed of large crystals of the Fe-poor, Mg-rich orthopyroxene (enstatite; En ~99). They also have minor phases of olivine, Ni-Fe-Si metal, and troilite, which indicate a magmatic formation under extremely reducing conditions. Recent works on MESSENGER-MDIS multispectral data suggested the presence of a few transitional elements such as Cr, Ti, Ni, and Co substituting Mg and/or Fe in pyroxenes (Lucchetti et al., 2018). Thus, to understand how the pyroxenes acquired such chemical abundances, and which magmatological meaning they have in the Mercurian magmatic system, we are acquiring Cr, Ti, Ni, and Co diffusion profiles in pyroxene in multiple aubrites (Pena Blanca Spring, Norton County, NWA 4537, NWA 6675). We are also planning to experimentally produce analog samples. Geochemical analyses will be performed using an EMPA system at the University of Milan and a LA-ICP-MS at the University of Pavia/CNR. This will allow us to: 1) better comprehend the formation and evolution of the Mercury crust; 2) derive spectral information from sample analogs in the range investigated by the SIMBIO-SYS/VIHI spectrometer on board the  BepiColombo mission before it reaches Mercury.

Evolution of Mercury-like lavas through aubrite meteorites: looking for sample analogs for the ESA/JAXA BepiColombo mission

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L'Istituto Nazionale di Oceanografia e Geofisica Sperimentale - OGS e il Dipartimento di Matematica e Geoscienze dell'Università di Trieste sono orgogliosi di ospitare il 90° Congresso della Società Geologica Italiana a Trieste dal 14 al 16 settembre 2021. La modalità del congresso è interamente online.

Con il motto "Geologia senza frontiere" questo evento mira a promuovere le Scienze della Terra come disciplina scientifica proiettata nel futuro, oltre i confini geografici, politici e disciplinari, per comprendere meglio l'interno del Pianeta Terra e la struttura del sottosuolo, difendere la società da pericolosi eventi geologici, comprendere meglio la variabilità climatica, pianificare l'utilizzo delle georisorse in modo etico e nel rispetto dell'ambiente.


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The National Institute of Oceanography and Experimental Geophysics - OGS and the Department of Mathematics and Geosciences of the University of Trieste are proud to host the 90th Congress of the Italian Geological Society in Trieste on 14-16 September 2021.  The Congress will be held entirely online.

With the motto "Geology Without Borders" this event aims to promote Earth Sciences as a scientific discipline projected into the future, beyond geographical, political and disciplinary boundaries, to better understand the interior of Planet Earth and the structure of the subsurface, defend society from dangerous geological events, better understand climatic variability, plan the use of geo-resources in an ethical way and respecting the environment.


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SGI 2021

Earth Sciences should be understood not only as necessary for a better understanding of the interior of the planet Earth, but also as a defense of society from dangerous geological events, for the understanding of climatic variations, for the planning and use of georesources in a ethical and respecting and protecting the environment.

Nicola Mari

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Evolution of Mercury-like lavas through aubrite meteorites: looking for sample analogs for the ESA/JAXA BepiColombo mission

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