Death of God and the creation of new values

Zarathustra ties the Übermensch to the death of God. While this God was the ultimate expression of other-worldly values and the instincts that gave birth to those values, belief in that God nevertheless did give meaning to life for a time. 'God is dead' means that the idea of God can no longer provide values. With the sole source of values no longer capable of providing those values, there is a real chance of nihilism prevailing.
Zarathustra presents the Übermensch as the creator of new values. In this way, it appears as a solution to the problem of the death of God and nihilism. If the Übermensch acts to create new values within the moral vacuum of nihilism, there is nothing that this creative act would not justify. Alternatively, in the absence of this creation, there are no grounds upon which to criticize or justify any action, including the particular values created and the means by which they are promulgated.
In order to avoid a relapse into Platonic idealism or asceticism, the creation of these new values cannot be motivated by the same instincts that gave birth to those tables of values. Instead, they must be motivated by a love of this world and of life. Whereas Nietzsche diagnosed the Christian value system as a reaction against life and hence destructive in a sense, the new values which the Übermensch will be responsible for will be life-affirming and creative.