* U.S. stocks surge in late rally on Lehman buyout talk
* Oil slides toward $100 a barrel on dollar, weaker demand
* Government debt prices pare gains as stocks rebound
* Bond prices climb in safety bid after global stock rout (Adds close of U.S. markets)
By Herbert Lash
NEW YORK, Sept 11 (Reuters) - U.S. stocks surged in a late-day rally on a report of a possible buyout of troubled investment bank Lehman Brothers, and the dollar rose to a one-year high as investors dumped overseas investments on worries of slower global growth.
Oil slid toward $100 a barrel, touching a five-month low of $100.10, on the stronger dollar, soft demand and a report that Saudi Arabia has no plans to cut output.
The drop in oil prices also underpinned the stock market as investors bet that falling fuel prices will shore up business and consumer spending and drove up energy-sensitive plays like airlines.
A report in The Wall Street Journal that Bank of America Corp was in talks to buy Lehman Brothers drove a last-minute rebound in financial shares.
U.S. Treasury debt prices rose in choppy trade as investors fretted over the health of the financial sector and the U.S. economy, sparking flight-to-safety buying in the face of a stock market that was lower for most of the day.
The U.S. dollar climbed to one-year peaks against the euro and a major currency basket as nervous investors sought refuge in the greenback's safety amid escalating global slowdown fears.
The euro at one point fell to $1.3891 <EUR=>, its lowest level since September 2007.
The low-yielding Japanese yen also benefited from a surge in risk aversion, pushing the euro, the Australian and New Zealand dollars to their lowest levels in at least two years.
U.S. stocks closed broadly higher after a day of sharp volatility where the major indexes see-sawed between positive and negative trade.
The bulk of the market's gains came within the last half hour of trading.
"The decline in oil is helping in the background, but it seems the market is more focused on credit issues and developments around Lehman," said Bobby Harrington, head of block trading at UBS in Stamford, Connecticut.
The Dow Jones industrial average <
> closed up 164.96 points, or 1.46 percent, at 11,433.88. The Standard & Poor's 500 Index <.SPX> added 17.07 points, or 1.39 percent, at 1,249.11. The Nasdaq Composite Index < > gained 29.52 points, or 1.32 percent, at 2,258.22.Shares of Lehman ended down 41.8 percent at $4.22, but most financial shares ended higher.
Bank of America <BAC.N> closed up 2.0 percent at $33.06, and American International Group <AIG.N>, the world's biggest insurer, recovered from double-digit losses to close up 0.3 percent.
Washington Mutual <WM.N>, the biggest U.S. savings and loan, closed up 22 percent at $2.83. Earlier, its shares sank to below $2 for the first time since 1990 on anxiety over its capital needs and survival prospects.
General Motors <GM.N> rose more than 11 percent, which traders attributed to hopes that Washington might work out a financial lifeline for the U.S. auto industry.
Stocks in Europe and earlier in Asia fell on fears about fallout from Lehman, which on Wednesday posted a $3.93 billion loss and failed to announce it had raised desperately needed capital.
Investors fear an unstable financial sector would hurt the economy as mounting mortgage losses restrain bank lending, a key source of business investment and consumer spending.
European shares fell for a third session in a row amid investor unease about financials. Banks were the biggest sectoral loser in Europe, with the DJ banking index <.SX7P> down 1.86 percent.
The FTSEurofirst 300 <
> index of top European shares ended down 0.65 percent at 1,140.71 points. The benchmark is down more than 24 percent so far this year."Overall on a 12-month view, the financial sector is unlikely to be a strong performer," said Ronan Carr, European strategist at Morgan Stanley.
"The profit outlook for banks will continue to be difficult, bad debt is likely to rise and the funding backdrop will remain difficult."
Shares of Societe Generale <SOGN.PA> fell 3.1 percent, Fortis <FOR.BR> shed 2.1 percent, BNP Paribas <BNPP.PA> dropped 1.1 percent, Dexia <DEXI.BR> slipped 4.1 percent and Credit Agricole <CAGR.PA> shed 2.3 percent.
U.S. Treasuries pared gains to trade mostly unchanged as investors bet on a Lehman stabilization plan. Two-year euro zone government bonds rose as jitters about the fragile U.S. banking system fueled demand for safe and liquid paper.
But a late bounce in European and U.S. equities from earlier steep lows pushed the 10-year Bund future down on the day after having traded in positive territory most of the session.
"Oil is helping everything across the board. We are seeing more of a rotation out of commodities into stocks," said Anthony Conroy, head trader at BNY ConvergEx, an affiliate of the Bank of New York Mellon Corp.
Oil fell from a rising dollar and a report from the International Energy Agency, which lowered its oil demand growth forecasts due to a slowing global economy.
U.S. crude <CLc1> fell $1.71 to settle at $100.87 a barrel after dipping as low as $100.10, the lowest level since early April. London Brent <LCOc1> slipped $1.68 to $97.29 a barrel after dropping to a six-month low of 96.99.
The dollar rose against major currencies, with the U.S. Dollar Index <.DXY> up 0.17 percent at 80.172. Against the yen, the dollar <JPY=> was up 0.51 percent at 107.05.
The euro <EUR=> fell 0.26 percent at $1.3948.
Analysts said the uncertain global economic outlook was causing U.S. investors to liquidate assets in emerging markets, where inflation was also becoming a problem.
"We believe a lot of the dollar buying we are seeing reflects U.S.-based investors selling overseas assets and bringing the money home," said Sophia Drossos, a currency strategist at Morgan Stanley in New York. "It appears to be concentrated more in emerging markets, judging from the weakness in some of those equity markets."
Gold, silver and platinum group metals all steepened recent days' losses, pulled lower by the dollar's strength, a drop in oil and the exit by investors from commodities to cash.
Gold prices <XAU=> fell $10.30 to $741.70 an ounce.
Shares overnight in Asia fell broadly, with persistent instability in the financial sector driving stocks outside Japan tumbling to their lowest in almost two years.
Tokyo's Nikkei share average <
> closed down 2 percent at a six-month low and MSCI's Asia Pacific ex-Japan index <.MIAPJ0000PUS> dropped 2.8 percent to its lowest since October 2006. (Reporting by Ellis Mnyandu, Richard Valdmanis, Lucia Mutikani, Chris Reese and Carole Vaporean in New York and Atul Prakash and Ikuko Kao in London; Writing by Herbert Lash; Editing by Leslie Adler)