* World stocks up 0.7 pct, set for 3rd monthly rise
* U.S. stocks mostly higher after deal news; Nasdaq slips
* Brent crude oil up slightly
(Updates prices)
By Caroline Valetkevitch
NEW YORK, Feb 28 (Reuters) - Major stock markets rose on Monday as worries eased about tensions in Libya and the dollar hit a 3-1/2-month low against a basket of major currencies.
World equities, measured by the MSCI All-Country World Index <.MIWD00000PUS>, added 0.7 percent, after rising 1.1 percent on Friday. The global index is up 2.3 percent this month, on track for a third straight monthly rise.
After worries about high energy prices and the Libya revolt pressured the Standard & Poor's 500 <.SPX> last week the index was up Monday amid optimism about deal news.
Ventas Inc <VTR.N> said it will buy Nationwide Health Properties <NHP.N> for $5.8 billion in a stock deal that strengthens its position as the biggest U.S. owner of senior housing. NHP shares jumped 10.2 percent to $42.92.
James Bullard, president of the St. Louis Federal Reserve, also gave stock investors reasons to be optimistic with his comments that the U.S. economy should do well in 2011 and oil prices are not currently a drag on the recovery.
"If oil prices rise further, it will restrain economic growth, but with no further escalations, at current levels it isn't going to cause a recession," said Jason Pride, director of investment strategy at Glenmede Investment and Wealth Management in Philadelphia.
U.S. stocks are still up substantially for the month, with the S&P Standard & Poor's 500 <.SPX> on track to gain 3.8 percent. The blue-chip Dow Jones industrial average and the Nasdaq were each up about 3 percent for February so far, based on midday levels in New York.
The market has defied expectations for a major correction, despite rallying since September and investor anxiety related to protests in Egypt last month and current problems in Libya.
The S&P 500 is up 26.1 percent since the start of September.
The dollar, however, came under pressure on expectations that Fed Chairman Ben Bernanke, in testimony to Congress later this week, will stick with his recent economic assessment that the recovery is strengthening, but not enough to bring about a significant improvement in the jobs market.
The Dow Jones industrial average <
> was up 47.91 points, or 0.39 percent, at 12,178.36. The S&P 500 was up 2.06 points, or 0.16 percent, at 1,321.94.But the Nasdaq Composite Index <
> was down 9.09 points, or 0.33 percent, at 2,771.96.Weighing on Nasdaq was a downgrade by UBS of online retailer Amazon Inc <AMZN.O> to "neutral" from "buy," due to higher costs. Amazon was down 2.2 percent at $173.36.
Brent crude oil prices were volatile, following a spike last week on worries over supply disruption from the Middle East and North Africa. Brent crude <LCOc1> was up 0.3 percent, or 30 cents, at $112.44 a barrel.
The uprising in Libya has cut as much as three quarters of the country's oil output, prompting Saudi Arabia to step in and plug the supply gap to Libya's oil buyers.
Brent crude is up more than 10 percent this month, heading toward its sixth straight month of rises. It touched a 29-month high of near $120 a barrel last week.
Spot gold <XAU=> stayed above $1,400 an ounce, reflecting investors' safe-haven bid due to turmoil in the Middle East and North Africa.
The U.S. dollar fell versus a currency basket as investors speculated that this week Fed chief Bernanke will signal continued support for the central bank's quantitative easing program.
Bernanke is scheduled to testify before key congressional committees on Tuesday and Wednesday. Expectations are that he will reiterate his view of an economic recovery that is still not strong enough to significantly reduce the jobless rate, suggesting the time is not ripe for U.S. interest rates to rise.
The ICE futures exchange's U.S. dollar index <.DXY>, which tracks the greenback's performance against a basket of major currencies, was down 0.4 percent. Earlier, the index hit its lowest level since Nov. 9.
U.S. Treasury prices were mostly up, with Federal Reserve purchases and subdued consumer spending in January seen as supportive.
Commerce Department data showed U.S. consumer spending was weaker than expected, down 0.1 percent in January, the first decline in a year.
The yield of the benchmark 10-year U.S. Treasury note <US10YT=RR> stood at 3.40 percent, down from 3.42 percent late last week.
"Look for (investors) to have 'one foot' in the Treasury market, and 'one foot' in something offering a higher return, as investors go back and forth, depending how the wind blows on some key global issues," said Kevin Giddis, president of fixed income capital markets at Morgan Keegan in Memphis, Tennessee.
According to fund tracker EPFR Global, a growing aversion to risky assets in the latest week fueled the biggest flows to global bond funds in more than three months, and turned more investors away from emerging market stocks. [
]The rotation out of emerging markets into developed markets, partly driven by inflation concerns in emerging economies, has led to outperformance in developed markets. The MSCI emerging market index <.MSCIEF> has lost 4.2 percent this year.
Credit Suisse's private bank expected the fund rotation to ease in the second quarter.
In Europe, the pan-European FTSEurofirst 300 index <
> of top shares closed 0.8 percent higher at 1,169.24 points. (Additional reporting by Edward Krudy, Ryan Vlastelica, Ellen Freilich and Wanfeng Zhou in New York; Dominic Lau, Neal Armstrong, Naomi Tajitsu, Sue Thomas and Rebekah Curtis in London; Editing by Andrew Hay)