Oil closed lower on Thursday in volatile trade, as a soaring dollar and the U.S. pursuit of an Iranian nuclear deal offset earlier gains from supply concerns in Libya and Iraq. Libya’s declaration of force majeure on nearly a dozen of its oilfields due to security concerns and arson attacks by Islamic State militants on Iraqi oil wells helped prices climb during the European session. In New York trade, the market came off its highs after the dollar hit 11-1/2 year highs against the euro, weighing on oil prices denominated in the greenback. Washington’s pursuit of a nuclear agreement with Tehran, which could end sanctions against Iran and bring more oil from the OPEC member into an already flooded market further dragged on prices. Even so, market bulls convinced oil had hit a bottom after the June-January selloff that had knocked 60 percent off prices […]