Here are some links with more information:
The Petrodollar, Iran and Gold - What You Need to Know
http://www.financialsense.com/contributors/marin-katusa/petrodollar-iran-gold-what-you-need-to-know
Iran, The Dollar and Financial Warfare
http://seekingalpha.com/article/348261-iran-the-dollar-and-financial-warfare
Massive Military Buildup Reported Around Iran