* Stocks surge after U.S. government bails out Citigroup
* Govt debt prices fall but yields close to historic lows
* Oil rises above $54 a barrel in anticipation of OPEC cut
* Dollar falls vs euro, sterling as risk aversion cools (Adds close of U.S. markets)
By Herbert Lash
NEW YORK, Nov 24 (Reuters) - U.S. stocks advanced broadly on Monday and government debt prices slid after Washington's rescue of Citigroup eased investors' fears that its collapse could push the global financial system into the abyss.
Oil jumped 9 percent to over $54 a barrel as the dollar weakened and on expectations that members of the Organization of Petroleum Exporting Countries will cut output further.
The Dow and S&P 500 posted their biggest two-day gains since the October 1987 crash, led by Citigroup's <C.N> 58 percent surge. The rally was broad, with gainers on the New York Stock Exchange outnumbering decliners by more than 7 to 1.
The euro and sterling extended gains against the dollar as risk aversion ebbed after the U.S. government agreed late Sunday to inject $20 billion of new capital into Citigroup.
The $300 billion-plus rescue package for Citigroup spurred broad equity rallies on both sides of the Atlantic, outweighing another batch of gloomy economic news that has hammered financial markets in recent weeks.
German corporate sentiment plunged to its lowest in nearly 16 years in November, an Ifo survey showed, while the pace of existing U.S. homes sales fell 3.1 percent in October and the median home price dropped to its lowest in more than four years, a National Association of Realtors report showed.
The Citigroup news lifted the battered financial sector, with the S&P Financial index <.GSPF> soaring almost 19 percent, and an index of home builders <.DJUSHB> rose 16.6 percent, its biggest one-day gain since Bear Stearns collapsed in March.
"The news on Citigroup is about confidence," said Cummins Catherwood, managing director at financial services firm Boenning & Scattergood in West Conshohocken, Pennsylvania.
"There's not a master stroke that's going to make everybody come out and be happy again. Confidence is a mosaic that has to be put up piece by piece and the Citi plan is just one piece."
Citigroup's rescue followed the disappearance this year of major Wall Street firms Bear Stearns Cos and Lehman Brothers Holdings Inc <LEHMQ.PK>, as well as the failure of Washington Mutual Inc <WAMUQ.PK>, the largest U.S. savings and loan.
JPMorgan Chase <JPM.N> and Bank of America <BAC.N> were other big gainers on the Dow, with JPMorgan rising 21 percent and Bank of America up 27 percent.
The Dow Jones industrial average <
> closed up 396.97 points, or 4.93 percent, at 8,443.39. The Standard & Poor's 500 Index <.SPX> jumped 51.78 points, or 6.47 percent, at 851.81. The Nasdaq Composite Index < > climbed 87.67 points, or 6.33 percent, at 1,472.02.European shares also raced higher on the Citigroup bailout, with the FTSEurofirst 300 <
> index of top European shares rising 8.9 percent to close at 828.63.Energy stocks were the top contributors to the index's rise, with BP <BP.L> up 11 percent, Total <TOTF.PA> up 12.5 percent and Royal Dutch Shell <RDSa.L> up nearly 14 percent.
Miners tracked higher metals prices. BHP Billiton <BLT.L> surged 22.9 percent, Anglo American <AAL.L> jumped 22.8 percent and Rio Tinto <RIO.L> climbed 18.1 percent.
However, yields of U.S. and European short-term government debt remained not far off record lows and gold prices shot higher as unease persisted about the depth of the credit crisis and global economic downturn.
"Another weekend, another bailout which seems to have contributed to a knee-jerk bounce in equities and unwinding of some of the safe-haven bid in Treasuries," said Kim Rupert, managing director, global fixed-income analysis with Action Economics LLC in San Francisco.
U.S. stocks pared some gains after President-elect Barack Obama, who named the team of officials who will steer his administration's economic policy, did not offer any new details about his plans to combat the slumping U.S. economy.
Wall Street later surged anew.
U.S. crude <CLc1> rose $4.57 to settle at $54.50 a barrel, while Brent crude <LCOc1> settled up $4.74 at $53.93.
"Today's move is signaling a shift away from the dominant bear momentum and should begin attracting dip-buyers for a run to $60 this week," Michael Vassar, analyst at 4castweb.com, said about the crude oil market.
The benchmark 10-year U.S. Treasury note <US10YT=RR> fell 27/32 in price to yield 3.34 percent. The 2-year U.S. Treasury note <US2YT=RR> shed 6/32 in price to yield 1.22 percent.
The dollar fell against a basket of major currencies, with the U.S. Dollar Index <.DXY> off 1.82 percent at 85.861. Against the yen, the dollar <JPY=> rose 1.24 percent at 97.05.
The euro <EUR=> gained 2.63 percent at $1.2909.
"The forex market continues to be all about risk appetite and its proxy, equities," said Dustin Reid, director of FX strategy at RBS Global Banking & Markets in Chicago.
U.S. gold futures closed 3.5 percent higher after the government's $20 billion injection of fresh capital and massive loss guarantees for Citigroup stirred inflation worries.
The December gold contract <GCZ8> settled up $27.70 to $819.50 an ounce in New York.
Overnight the MSCI index of Asia-Pacific stocks excluding Japan <.MIAPJ0000PUS> briefly posted a small gain after the Citigroup news, but was off 0.7 percent when Asian markets closed. Japanese markets were closed for a public holiday. (Reporting by Ellis Mnyandu, John Parry, Vivianne Rodrigues and Frank Tang in New York, and Kirsten Donovan, Atul Prakash and Alex Lawler in London; Writing by Herbert Lash; Editing by James Dalgleish)