The standing vertical jump of elite marathoners is something like 12"-13". The corresponding figure for sedentary folks is more like 18"-19". Anecdotally, I know some distance guys who set PRs in the 200 after having to take an extended time off due to injury, burnout, or work demands.
Distance running does not hurt your explosiveness. When I was at my best running shape, I could dunk easily one or two-handed and hurdled over a 5'6" bar (yes, in a meet, I did it for fun and didn't know how to flop), also long jumped 18+ although I took off about a foot behind the board and had no idea on form. 12 years later I don't run but I'm considerably stronger, and I can just barely throw it down with one hand and I mean barely. And I could definitely not approach those jumping marks.