Fig. 5: Volcanic structures in the context of regional crustal properties.

a, MOLA elevation data show that the Eridania basin is composed of a series of 1- to 3-km-deep subbasins. Volcanoes identified in this study are marked with black squares. b, The volcanoes occur in a zone of high crustal potassium. c,d, The basins (c) have 10 to 20 km thinner crusts. Wrinkle ridges marked by black lines (c,d) occur in NE- and NW-trending lineaments, which also mark zones (d) of disruption of the remnant crustal magnetism. Lat., latitude; Br, radial magnetic component.