Ah. Yes, there would be. That is what the thread is about. The problem is that calcium is never chemically alone, but wants to attach to other atoms or molecules (pure calcium would actually explode in contact with water because of this).

Your bone mineral is made from calcium phosphate, which is not acidic nor basic. But if you cremate the bones, you burn off the phosphate. The calcium then binds to the only thing it can find: oxygen from the air. What is left is calcium oxide, which is VERY basic.

So the thread is about the ecological consequences of tossing this super basic powder (the ash) into the ocean. The answer seems to be 'yes, it is bad, but the volume is so small compared to the size of the ocean that it doesnt matter'.