gravitydriven t1_iu3zn8t wrote on October 28, 2022 at 11:49 AM

Reply to comment by DrFlukey in Magma on Mars Likely - Until now, Mars has been generally considered a geologically dead planet. An international team of researchers led by ETH Zurich now reports that seismic signals indicate volcanism still plays an active role in shaping the Martian surface. by GeoGeoGeoGeo

No, hot spot volcanism is due to a singular active plume within the mantle. Why/if there is a singular active plume of hotter material I can't really guess at. But to get a magnetic field (usually, usually) you would need some kind of consistent motion in a liquid iron (outer) core. I say usually bc there are planets with induced magnetic fields e.g. Mercury, some moons of Jupiter