* Dollar rises back, pressures oil further
* Chinese oil production, imports up in Sept
* Coming Up: U.S. CFTC trader position data, Friday
(Recasts, updates prices and market activity, new byline, changes dateline, previously LONDON)
By Gene Ramos
NEW YORK, Oct 21 (Reuters) - Oil slumped more than 2 percent on Thursday in a sell-off sparked by the dollar's recovery from an earlier dip, as doubts resurfaced about the extent of potential U.S. monetary easing.
The latest derailment comes after after U.S. crude oil posted its biggest daily percentage gain in more than a month on Wednesday, following a 4 percent dive on Tuesday, when China raised its interest rates.
At 1:50 p.m. EDT (1750 GMT), U.S. December crude contract <CLc1> the new front-month, fell $2.17 to $80.37 a barrel. U.S. crude reached a five-month high of $84.43 on Oct. 7.
"Some stops were triggered on the way down and there may be a perception change and people thinking the dollar may be oversold and that the Fed may not be able to deliver as much quantitative easing and it may be priced in," said Richard Ilczyszyn senior market strategist at Lind-Waldock in Chicago.
Sell stops were triggered at $81.30 and later accelerated as $80.80 was hit before midday.
"Oil is trapped in this $76-to-$84 range and is very receptive to currency moves," Ilczyszyn said.
In London, ICE December Brent <LC0c1> dropped $1.90 to $81.70.
"The oil market appears exhausted after two very volatile trading days and there is uncertainty about the price direction." said Gene McGillian, analyst, Tradition Energy, Stamford, Connecticut.
DOLLAR REBOUNDS IN SEESAW TRADING
The dollar, whose movement in the past two days dictated the direction of commodities prices, seesawed.
At 1:40 p.m. EDT, the U.S. dollar was up 0.29 percent against a basket of currencies <.DXY>, after moving down earlier. Much earlier, the greenback rose after U.S. Treasury Secretary Tim Geithner said in Tokyo that there was no need for the dollar to sink further against the euro and the yen.
A stronger dollar makes dollar-denominated oil more expensive to other currency holders.
A record influx of crude oil into China last month far surpassed the needs of the country's refining sector, leaving an apparent surplus of 1.5 million barrels per day, according to Reuters analysis of Chinese data. [
]September data showed record imports and production, coupled with a release of commercial stockpiles, all of which left the Chinese market flush with oil.
Lending some downside pressure earlier was data showing that China's economic growth slowed a little in the July-September quarter, growing at 9.6 percent year-on-year, down from 10.3 percent in the second quarter.
U.S. crude oil inventories rose last week by 667,000 barrels, and even though smaller than expected, was overridden by the dollar's strength that pulled crude prices higher.
Distillate stocks fell and gasoline posted a surprise build, but the overall fundamental weakness remained.
Oil prices have found support at around $80 in recent sessions on expectations that the U.S. Federal Reserve would launch another round of monetary easing, probably as early as next month.
In other news, France's 12 oil refineries remained blocked on Thursday with fuel supplies from them still cut off, as workers continued strikes to protest against the reform of France's pension system, the CGT union said. (Additional reporting by Robert Gibbons in New York; Christopher Johnson and Isabel Coles in London; and Alejandro Barbajosa in Singapore; Editing by Lisa Shumaker)