* Global stocks plunge as U.S. auto rescue prospect dims
* Oil falls under $50 a barrel to a 22-month low
* Debt rallies after U.S. jobless data raises growth fears
* U.S. dollar, euro extend losses vs yen on risk aversion (Recasts with U.S. markets, adds byline; dateline previously LONDON)
By Herbert Lash
NEW YORK, Nov 20 (Reuters) - Fear of a prolonged and deep global recession buzz-sawed through global markets on Thursday, sending U.S. stocks to six-year troughs, yields on government debt to record lows and the price of oil below $50 a barrel.
The bleak economic outlook triggered technical breaches by major stock indexes around the world, an event that could unleash greater turmoil as bear-market sentiment deepens and threatens to spiral markets into a treacherous slump.
Crude oil <CLc1> slipped to $49.75 a barrel, the lowest level since May 2005.
The stampede into low-risk assets from stocks pushed ultra-short U.S. government bill rates toward zero percent and two-year yields to a series of record lows.
The S&P 500, the benchmark for U.S. institutional investors, fell to its lowest level since October 2002, while other U.S. indexes and benchmarks in Europe and Asia set fresh 5-1/2-year lows. Two out of every five issues traded on the New York Stock Exchange plummeted to 52-week lows.
The stock of corporate icons Citigroup, General Motors and Ford plunged anew as all three traded below $5 a share. Ford closed in on penny-stock level as the prospect that U.S. automakers may fail to get a government bailout unnerved investors.
Yields on U.S. government debt also fell to record lows. The 30-year long bond declined to lows last seen in the early 1960s, and two-year notes
Fresh economic data reinforced the market gloom. The Conference Board's index of Leading Economic Indicators fell to its lowest level in four years in October, factory activity in the U.S. Mid-Atlantic region fell to an 18-year low in November, and the number of American workers lining up for first-time jobless benefits surged to a 16-year high last week.
"Anxiety about the financial markets is shifting to anxiety about fundamentals and the real economy, and that's keeping the overall levels of risk aversion very high," said Vassili Serebriakov, currency strategist at Wells Fargo in New York.
"We've had disappointing U.S. economic data and we believe the bear market in equities will continue, lending more support to the dollar and yen."
U.S. indexes pared losses before midday after an early morning plunge, and the Nasdaq gained slightly.
Before noon, the Dow Jones industrial average <
> was down 35.29 points, or 0.44 percent, at 7,961.99. The Standard & Poor's 500 Index <.SPX> was down 8.79 points, or 1.09 percent, at 797.79. The Nasdaq Composite Index < > was up 3.40 points, or 0.25 percent, at 1,389.82.The picture in Europe was no better. Commodities, a harbinger of global economic growth, were among the biggest losers on the index of leading European companies.
The FTSEurofirst 300 <
> index of top European shares unofficially closed down 3.7 percent at 781.9 points. The index has shed about 48 percent so far this year.Among mining companies, Vedanta Resources <VED.L> plunged almost 13 percent, Xstrata <XTA.L> shed 10 percent, while Kazakhmys <KAZ.L> and Rio Tinto <RIO.L> each fell almost 9 percent.
Oil stocks also weakened as crude prices <CLc1> slipped down more than 5 percent.
Total <TOTF.PA>, ENI <ENI.MI> and BP <BP.L> were down between 4.4 percent and 4.9 percent.
Declining prices in one asset class fed declines in another, analysts said. The biggest indicator in market sentiment in recent weeks has been stocks.
With economies weakening worldwide, Deutsche Bank said crude oil could fall to as low as $40 a barrel next year.
"Weakness in stocks reflects weakness in the economy at the moment looking forward, but I think the general trend in oil is lower anyway," said Sucden's head of research Michael Davies.
"It's a bit of a chicken or egg thing. Everything's moving together, it's hard to say what's leading."
The U.S. dollar and euro extended losses against the yen, each falling more than 1 percent, as global recession fears pushed risk-averse investors to the Japanese currency.
Risk aversion benefits the yen as investors pull money out of higher-yielding assets such as stocks and commodities, positions that were financed with a cheaply borrowed yen.
The dollar, however, gained against high-yield currencies, and rose against a basket of major currencies; the U.S. Dollar Index <.DXY> was up 0.14 percent at 87.923. Against the yen, the dollar <JPY=> fell 0.91 percent at 95.03.
The euro <EUR=> fell 0.06 percent at $1.253.
Short-dated yields on euro zone government bonds hit their lowest levels in over five years. Two-year bond yields <EU2YT=RR> were 11.5 basis points lower at 2.056 percent, having fallen as low as 1.989 percent.
The benchmark 10-year U.S. Treasury note <US10YT=RR> was up 34/32 in price to yield 3.22 percent. The 2-year U.S. Treasury note <US2YT=RR> rose 4/32 in price to yield 1.01 percent.
Overnight in Asia, Japan's Nikkei average <
> dropped nearly 7 percent.The MSCI All-Country World Index <.MIWD00000PUS> was down 3.2 percent at 196.12 -- its lowest level since May 2003. (Reporting by Ellis Mnyandu, Richard Leong, Steven S. Johnson in New York and Rebekah Curtis, Kirsten Donovan, Chris Baldwin and Pratima Desai in London, writing by Herbert Lash; Editing by Leslie Adler)