Aren't you concerned about endangering the faith of YECs about the origins and age of the Grand Canyon?
The idea of a volcano intruding into recent "great flood deposits", still pretty wet, would produce a whole lot of steam and interesting local effects on the sediments. Is there any evidence of this?
More to the point the volcano is younger than the canyon. The lave flow is down the side of the canyon. Does it go all the way to the water?
Nope! (Plus, I bet there's some way to date those lava flows.)
"In the last 2 million years, more than 150 lava flows have poured into the Grand canyon. These flows formed 13 major lava dams that ranged in height from 200 feet (60 m) to 2,000 feet (600 m) in height. The largest dam impounded a lake that was more than 2,000 feet (600 m) deep and had a shoreline near the base of the Redwall Limestone. Two lakes were so large that they extended into Utah and beyond the present shoreline of Lake Powell. Most of the lava dams are less than 1.2 million years old."