Iron is produced in the cores of massive stars (at least 8-11 solar masses) as they near the end of their main-sequence lives. Silicon produced through nucleosynthesis earlier in the star's life undergoes successive alpha-particle fusions, culminating in the formation of nickel-56. Nickel-56 is unstable and decays into iron-56, the most common isotope of that element. Iron-52 is also produced and is in fact the precursor nucleus to nickel-56 in the fusion chain.

http://en.wikipedia.org/wiki/Silicon_burning_process

After the Big Bang, the universe had to first cool enough for neutral atoms to form, and then the atoms had to collect into gas clouds dense enough to trigger star formation. It is estimated that this process took about 100 million years. It then took a few million more years for the most massive of these stars to evolve to the iron-fusing stage, become supernovae, and blast the newly created iron into surrounding space. All of the iron in the universe was formed in massive stars scattered throughout the universe and distributed by the supernova explosions of those stars.

http://access.ncsa.illinois.edu/Stories/FirstStars/Stars1.html

Quasars are a class of galaxy with extremely active nuclei. As such, they certainly contain massive stars which produce iron in their cores, but there is nothing about quasars as a whole that would make them extraordinary iron producers.

http://csep10.phys.utk.edu/astr162/lect/active/quasars.html

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