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And perhaps the most important part, the volcano is at a depth of 1,410 m, how could it be that of those 1,410m only the last 91 are being heated.
Second water is really hard to heat, the heat capacity is 4.18 joules per gram per degree Celsius, the blob is 1 to 4ºC hotter, to heat just 1 degree that much water is needed 1petajoule or 1/4 of megaton of TNT
its insignificant because hot water do not rise
Hydrothermal plumes form above sites of venting because of the buoyancy of the hot hydrothermal fluids that rise, entraining ambient sea water with a consequent continuous increase in plume volume, until neutral buoyancy is achieved and the plume disperses laterally.
During plume rise, ambient seawater is entrained from a range of depths such that the concentration of a property in the neutrally buoyant plume is a function of both the concentration and flux of that property in the vent fluid, and of the background profile of the property integrated over the whole height of rise of the buoyant plume.
But what if the total volume of heated water is sufficient that the Neutrally Buoyant Point reach the surface?