Chemical characterization of fe-rich diagenetic nodules with chemcam in the

Introduction: Since 2012, the Curiosity rover has been investigating Gale crater on Mars. Today, after ~3000 Sols (martian days), it is now located in the clay-rich region of Glen Torridon (GT). GT sedimentary strata are conformable with the previous terrains of the Murray formation, and the lower part of the GT region is stratigraphically equivalent to Jura, the upper member of Vera Rubin ridge (VRR) [1]. In some sedimentary rocks of Glen Torridon, particularly in the “fractured Intermediate Unit” (fIU), diagenetic concretions have been observed (e.g., Figure 1). Such features are relatively common in the Murray formation and many kinds of concretions were encountered along the rover traverse with distinct morphologies and chemical compositions (e.g., [2]) that suggest a complex hydrological history with multiple episodes of fluid circulation in the sedimentary rocks of the crater.