BUZZ-Oil and gas producers: China, Iran weigh on oil prices
** U.S.-listed shares of oil and gas producers and services providers drop as oil prices fall more than 3 percent on Chinese demand concerns and indications of Iran nuclear deal progress
** Brent falls as much as 3.2 pct to $48.85/barrel; U.S. crude falls as much as 2.8 pct to $45.94, extending last week's steep losses
** Exxon Mobil down 1.9 pct at $80.89, Chevron Corp down 1.9 pct at $89.52, biggest drags on Dow and S&P 500
** Chesapeake Energy Corp shares down 4 pct at $8.05, Marathon Oil Corp down 2.6 pct at $18.77, Murphy Oil Corp down 4.4 pct at $27.67, ConocoPhillips down 2.5 pct at $53.85
** Stone Energy Corp down 8.6 pct at $6.67, Baytex Energy Corp down 7.6 pct at $4.25, EP Energy Corp down 6.2 pct at $6.39, California Resources Corp down 5.8 pct at $4.22
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