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   Fluids are present and play an essential role in the internal and external evolution of the Solar System's solid bodies. They interact with rocks (including ices) in terms of composition (magmatism, metamorphism, metasomatism, weathering) and shape (deformation, erosion, sedimentation). The second GeoPlaNet international thematic school (12th-16th nov. 2018), organised by the Laboratoire de Planétologie et Géodynamique in Nantes (France) provided an overview of these interactions in rocky and icy bodies of all sizes.

   This high-level training program in Planetary Geosciences covered various aspects of these interactions through physics, chemistry, mineralogy, petrology, tectonics, geomorphology and sedimentology. In addition to reporting on and comparing the most recent results derived from space missions in the Solar System and observations on the Earth, the school trained participants in various techniques for observing, analysing, experimenting and modelling the compositional and morphological aspects of fluid-rock interactions on all solid bodies of the Solar System. The school included lectures and practicals, as well as poster presentations by attendees. It was organised along two themes:

Theme 1- Fluid-rock interactions on planetary surfaces
Theme 2 - Fluid-rock interactions in planetary interiors

   All participants were invited to attend all lectures (approx. 12 h in total) related to the two themes. Upon registration, they selected one series of practicals (approx. 12 h) out of three sets:

• Planetary surfaces:
       -fluid-related rock deformation, rock weathering, sedimentation, hydrothermalism;
       -spectroscopy of rocks and minerals, field excursion, experimental modelling, lab. analyses;
• Planetary interiors - Experimentation:
       -volatile cycle, metasomatism, deep magmatic source;
       -petrology, geochemistry, laboratory analyses, experimentation;
• Planetary interiors – Numerical modelling:                                                                                                          -  icy ocean worlds, mantle dynamics;                                                                                                          - geophysics, numerical modelling; 

The event was opened to French and international Master students, PhD students and young researchers with a background in geosciences and/or in planetary science. About 65 attendees participated in this training, more than half of whom were foreigners. Sixteen countries from the Americas, Europe, Asia and Africa were represented and thirteen foreign institutions from the GeoPlaNet consortium had members present at the event.

   All attendees were offered to display one poster of their own in relation to planetary surfaces or planetary interiors themes. Distinct prizes were awarded for master students, PhD students and young researchers. Here are the results.

   The field school was organised by Laboratoire de Planétologie et Géodynamique (CNRS, Université de Nantes, Université d'Angers) in collaboration with its GeoPlaNet partners. It was part of the GeoPlaNet project and was funded by Région Pays de la Loire, CNRS, Programme National de Planétologie (CNRS-INSU), Université de Nantes and Observatoire des Sciences de l’Univers Nantes-Atlantique.