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Oil tumbles on Iran, Libya; worry about high supply returns

* Brent ends 5 pct lower, biggest drop in a day since Feb. 4

* U.S. crude down slightly as players narrow gap in spread play

* Speculation over Iran nuclear deal, higher Libyan output weigh

* Stronger dollar also a negative for oil and other commodities

* Coming Up: American Petroleum Institute (API) report on Tuesday (Adds closing prices, comment on supply worries, paragraphs 1-5, 10)

By Barani Krishnan

NEW YORK, March 2 (Reuters) - Brent futures fell 5 percent, its most in a month, on Monday as speculation of a nuclear deal that could lift Iran's sanctions and boost its oil exports brought worries about high supplies back to the market.

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Rising Libyan crude output and a firmer dollar also weighed on Brent.

U.S. crude futures also fell but only slightly, supported by data suggesting a smaller-than-expected build last week in the Cushing, Oklahoma delivery point for oil.

Players were also betting the spread between the two oils would narrow after Brent's premium to U.S. crude hit a 13-month high on Friday, market sources said.

"I think we've been subjected to a reality check after the fake rallies of last week," said Dominick Chirichella, senior partner at the Energy Management Institute in New York. "The reality is there's a huge surplus of oil not only in the United States, but also globally, and it's growing."

Brent's front-month fell below the psychological $60-a-barrel support, closing down $3.04 at $59.54, after talk of a sooner-than-expected nuclear deal for Tehran. Brent rose 4 percent last week to finish February up 18 percent.

Monday's tumble came after Iranian Foreign Minister Mohammad Javad Zarif said a deal on Iran's nuclear programme could be concluded this week if the United States and other Western countries had sufficient political will and were agreeable to removing sanctions.

Iranian oil exports have been restricted for several years now by U.S. and European sanctions, although Tehran says its nuclear plans are peaceful.

Analysts believe Iran will be able to boost its oil sales fairly quickly without the restrictions, raising exports by up to 1 million barrels per day (bpd). A Reuters survey last week showed Iran pumped a total of around 2.8 million bpd in February.

Brent futures were also pressured by data showing Libya's output had grown to above 400,000 barrels per day from 363,000 bpd in January. The dollar's rise to an 11-year high had weighed on greenback-denominated commodities as well.

In U.S. crude, the front-month settled down 17 cents at $49.59 a barrel after Genscape reported a 1.4-million-barrel build last week at the Cushing delivery point for oil, versus trade expectations of 2 million barrels or more.

Genscape's Cushing report, and the American Petroleum Institute (API) inventory data on Tuesdays, are a precursor to the government's weekly crude stockpiles report on Wednesdays.

Brent's premium to U.S. crude (CL-LCO1=R) narrowed to around $10 a barrel, after a January 2014 high of $13 hit on Friday. (Additional reporting by Robert Gibbons in New York, Christopher Johnson in London and Florence Tan in Singapore; Editing by David Holmes, Pravin Char, Marguerita Choy and Diane Craft)