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Paul Erdman's Crash of '79 ends with the Shah of Iran detonating salted bombs over most of the petroleum fields in the Middle East, blanketing them in fallout that will remain fatally radioactive for decades. There isn't much detail about what happened next, apart from the United States surviving the near collapse of the dollar and its banking system before entering into a severe recession.
What if something like that had occurred between the early 1970s or early 1990s, removing a large amount of Middle Eastern petroleum from the market? Perhaps the Yom Kippur War goes out of control and results in Israeli nuclear strikes on Saudi Arabia and Iraq. Maybe events in Iran turn out a bit differently, with Imperial Iran collapsing later when it has a more advanced nuclear power program, and/or Iraq somehow acquires nuclear weapons and uses them in an alternate Iran-Iraq War or during Desert Storm.
What would the aftermath look like for the world? Would the West suffer economic collapse due to the loss of petroleum? Would Soviet fortunes reverse as they become the largest exporter of petroleum in the world, in addition to being the largest natural gas exporter? Would there be a push for nuclear disarmament or at least greater arms control?