Just like in a nuclear power plant, you don't have to take the steam directly from the heat source to the turbine. Closed loop circulations with intermediate heat exchangers are very likely to be used.
“Just like in a nuclear power plant, you don’t have to take the steam directly from the heat source to the turbine.”
Wrong. This way it’s only handled in a PWR (pressure water reactor). In a BWRs (boiling water reactor) the turbine is feed with primary (radioactive contaminated) steam.
In Iceland they create 27% of their electric power using geothermal energy. Thats more then our nukes do (20%).
What ever could go wrong, you can see near the german/swiss border. Fracking for geothermal power in Basel (switzerland) created three quakes with magnitudes between 3.4 and 5.8 in southern germany and northern switzerland. In a city called staufen they drilled into a gypsum layer beneath the groundwater level. Heavy damages among almost all buildings in town are the result. The gypsum layer got flooded and startet bloating. In some parts of the town the ground rose up to 15 inches.