This result certainly can still support the theory of plate tectonics. As plates move with respect to one another, there are 3 main ways they can interact at the margins: 1. Subduction zones, where they collide to produce volcanos and ridges 2. Divergent margins, where they are moving away from each other, producing deep sea ridges 3. Transform margins, where the plates are sliding past one another laterally.
Volcanoes are not the only thing associated with plate boundaries. Over a relatively short period of geological time (10 years), and with no volcanic activity observed, it's likely the scientist is observing a divergent or transform margin, as opposed to the subduction margin commonly associated with volcanism.
You cannot say it does not support the theory of plate tectonics because a decade is not enough time to observe the effects. Also, there are three ways tectonic plates can move: convergent boundary = collide into each other, divergent boundary = they separate, and transform boundary = they move back and forth. The tectonic plate collisions can create nine different plate collision combinations. Some effects of some collisions are the formation of new volcanoes, but not always. Other collision combinations can form mountain ranges or islands, can create new sea floors, can widen an ocean basin, or can cause earthquakes. The fact that no new volcanoes have been formed does not mean it does not support the theory of plate tectonics.
Magnesium is a chemical element with the symbol Mg and atomic number 12. It is a shiny gray solid which bears a close physical resemblance to the other five elements in the second column of the periodic table: all group 2 elements have the same electron configuration in the outer electron shell and a similar crystal structure.
