* Oil surges on Libya turmoil, prompting share sell-off
* Wall Street set to join global share sell off
* U.S. Treasuries get safe-haven flows
By Jeremy Gaunt, European Investment Correspondent
LONDON, Feb 22 (Reuters) - World stocks fell sharply on Tuesday as revolt in Libya drove oil prices to 2-1/2 year highs, prompting fears of disruption to global economic growth.
Widespread risk aversion boosted the Swiss franc and prompted strong flows into U.S. Treasury bonds. U.S. stock index futures also tumbled, suggesting significant losses on Wall Street when it opens.
U.S. crude futures <CLc1> hit a 2-1/2 year high and were later up nearly 8 percent at more than $93 a barrel on the latest contract's last day of trading, as deadly clashes wracked exporter Libya's biggest cities.
Brent oil <LCOc1> was up more than 1 percent a barrel at nearly $107, somewhat shy of Monday's intra-day 2-1/2 year peak.
Libya is by no means the world's largest oil producer, ranking third in Africa after Nigeria and Angola, but investors are concerned about the spread of trouble and a serious disruption to supply.
"Investors are scaling down on exposure across the board," said Richard Falkenhall, currency strategist at SEB in Stockholm. "Libya is the first major oil exporting country to be affected ... if this spreads to other oil exporting countries, it will not be a good sign."
Adding to the uncertain mood, two Iranian ships entered the Suez Canal on Tuesday on their way to the Mediterranean, a move that is bound to anger Israel. [
]Investors are primarily concerned that Middle East/North Africa trouble will keep oil prices high, driving up inflation, cutting into corporate profits and crimping economic growth.
This could be seen most clearly on Tuesday in MSCI's benchmark emerging market stock index <.MSCIEF>, which was down 1.6 percent. Leading emerging market economies are among the fastest growing in the world and the most susceptible to inflationary pressure.
Globally, world stocks as measured by MSCI <.MIWD00000PUS> were down around three-quarters of a percent. Europe's FTSEurofirst 300 <
> was down 1 percent. Japan's Nikkei < > earlier lost 1.8 percent.<^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
For a graphic on recent market reaction, click:
http://r.reuters.com/zen28r
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FLIGHT TO SAFETY
The risk-averse mood triggered a broad flight to safety. The yield on 10-year U.S. Treasuries <US10YT=TWEB> fell 7 basis points to 3.509 percent. Yields on core euro zone debt <DE10YT=TWEB> lost 3 basis points to 3.160 percent.
"The situation in the Middle East is overshadowing everything else, and we've broken a series of technical levels on the way up," a trader said.
On foreign exchange markets, the dollar initially rallied broadly, but was later only slightly up on a basket of major currencies <.DXY>.
This was mainly due to a recovery by the euro, which was flat on the day a $1.3671 <EUR> after hawkish talk from a European Central Bank member.
The euro <EURCHF=R> fell against the Swiss franc, pushing the traditional safe-haven currency to its strongest in three weeks.
Separately, the New Zealand dollar hit a near two-month low against its U.S. counterpart after investors fretted about the economic damage caused by a strong earthquake which rocked the country's second biggest city, spurring speculation about the chance of an interest rate cut. (Additional reporting by Naomi Tajitsu and William James; Editing by Toby Chopra)