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View Full Version : Questions about Io's interior and volcanism.



Zero Signal
2004-Mar-27, 04:54 PM
We all know that Io's volcanoes erupt countless tons of material onto the surface each year, and have likely been doing so for many millions of years. The volcanic material comes from inside Io, of course. However, Io has no plate tectonics, and thus no subduction zones to send old crust back into the interior. This being so, Io's mantle must continually deplete its own mass as its material is ejected by the volcanoes. So do the volcanoes eject enough material to have a sufficient impact on the overall structure of the mantle? Also, how long would it take to completely expell Io's mantle?

Kaptain K
2004-Mar-28, 01:06 AM
As the ejected material builds up on the surface, older material gets driven down into the interior. Subduction is not required for recycling from inside to outside and back again.

Brady Yoon
2004-Mar-28, 02:34 AM
The mantle wouldn't get depleted because surrounding mantle would sort of "fill up the holes" created by volcanic chambers since it's really hot and the mantle is a plastic solid.

Zero Signal
2004-Mar-29, 05:58 PM
As the ejected material builds up on the surface, older material gets driven down into the interior. Subduction is not required for recycling from inside to outside and back again.

Kind of like how tectonics on Venus works, right? This same principle also applies to tectonics on Europa (http://www.physics.utoledo.edu/~lsa/_ice/abl03d.htm) doesn't it?

Eros
2004-Mar-29, 06:14 PM
plus... arnt Io's vulcanism fueled by tidal interactions between itself and Jupiter? so maybe you dont have plates as such but the surface and mantel are so unstable and active that plates arnt needed?
-just an idea

aurora
2004-Mar-29, 07:50 PM
plus... arnt Io's vulcanism fueled by tidal interactions between itself and Jupiter? so maybe you dont have plates as such but the surface and mantel are so unstable and active that plates arnt needed?
-just an idea

Heat builds up and it has to exit somehow. Radiation can't shed the heat fast enough, so the molten material reaches the surface.

There are hotspots on Io that stay active for years, as we've found.

Plate tectonics apparently need something that Io lacks, such as an ocean.