The dark terrain of Ganymede is the oldest geologic unit of the satellite, subsequently crosscut by the youngest light terrain. It shows morphotectonic structures called furrows, which are radial or circumferential troughs bounded by high albedo rims and a lower albedo floor. It is assumed that furrows represent a multi-ring basin formed by an ancient impact crater (McKinnon & Melosh, 1980; Prockter et al., 2000). In fact, Galileo Regio’s furrows show a concentric pattern centered at around 20° S 180° W, which is the assumed location of the crater (Prockter et al., 2002; Hirata et al., 2020). Most of them have been preserved in their pristine form, while some have acted as zones of weakness and have been re-used by later tectonic deformation. These zones are likely considered as precursors of grooved terrain formation. In this contribution, we present the structural mapping at the regional scale of the furrows in Galileo Regio, and we identify their hierarchy and tectonic setting originated by strike-slip and shortening. Riedel shear, synthetic and antithetic structures, and conjugate fractures have been identified. Hence, the performed mapping allows to infer the tectonic setting of the furrows and their associated structures, and in turn the (paleo)stress field that affected the area. Galileo Regio has been deformed by the same regional kinematics consistent with the right-lateral transpression that has affected Uruk Sulcus (Rossi et al., 2018). We infer a ≈ NE-SW trending maximum horizontal stress responsible for a shortening associated with strike-slip in the area extending from 180°-120° W to 0°-60° N. This work confirms the key role that transpression has played in the leading hemisphere of Ganymede and further statistical analysis will be performed to support this reconstruction. The produced tectonic model will be used for the scientific preparation of future high-resolution observation that will be performed by the JANUS instrument onboard JUICE mission (Palumbo et al., 2014).

Strike-slip and shortening in the dark terrain of Ganymede

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Strike-slip and shortening in the dark terrain of Ganymede

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