Maintenance for the week of February 9:
• NA megaservers for maintenance – February 9, 4:00AM EST (9:00 UTC) - 12:00PM EST (17:00 UTC)
• EU megaservers for maintenance – February 9, 9:00 UTC (4:00AM EST) - 17:00 UTC (12:00PM EST)
Elemental damage is a category of magic damage, so the damage from the flame/frost/lightning weapon enchantment should be based off of magicka damage. If you have added spell resistance, it will resist flame/frost/lightning damage, so it should go the other way around too. However, the damage the weapon itself does should still be based off of weapon damage, so on a hit, you're doing both weapon and spell damage. Crit should apply just as damage does. I have not tested any of this (so take it with a grain of salt), but this is how the game should work based on my understanding of it.