(Updates with Wall Street open, U.S. economic data, new dateline and byline)
By Daniel Bases
NEW YORK, Aug 12 (Reuters) - Global stock markets sagged and a U.S. dollar rally lost steam on Tuesday as markets were hit by concerns the economy may again be slowing, a factor that also pushed oil down.
Losses stemming from the mortgage crisis in the United States undercut a two-day surge in U.S. stocks and prompted investors to lock in some profits.
Bank stocks led the decline after No. 3 U.S. bank JPMorgan Chase <JPM.N> said it has taken another $1.5 billion in losses in the current quarter and Swiss bank UBS <UBSN.VX> reported worse-than-expected losses as a result of the credit crisis.
The dollar index <.DXY>, which tracks the U.S. currency against a basket of currencies, rose marginally to 76.250, up just 0.164 percent on the day. Earlier it hit a six-month high of 76.616, rising more than 7.4 percent in five weeks.
"The dollar rally has temporarily stalled with players looking to take profit on recent out-sized moves," said Michael Woolfolk, senior currency strategist at The Bank of New York Mellon.
In June, when the dollar was well below its current levels it helped push exports higher and overpower then record-high prices for imported oil. That resulted in an unexpected narrowing of the U.S. Trade deficit to $56.8 billion, down from a revised estimate of $59.2 in May.
In response to falling stocks and commodity prices, government bonds rallied in the United States and Europe. A drop in oil prices eased some concerns about inflation pressures but also showed global demand was slowing.
Earlier on Tuesday, European Central Bank Executive Board member Lorenzo Bini Smaghi told Italian newspaper Il Messaggero that growth in the European economy is slowing down faster than expected, helping to push the euro to a six month low against the greenback.
The euro traded at $1.4888 <EUR=>, while the British pound fell to a 21-month low near $1.8987 <GBP=>.
"The deteriorating economic outlook for the euro zone and elsewhere is now having an impact after the market had become used to weakness in the U.S. economy," said Kosuke Hanao, head of forex sales at HSBC in Tokyo.
If the rest of the global economy is slowing, the rationale for holding currencies against the U.S. dollar is diminished as the prospects for lower interest rates erodes the interest rate yield advantage currently held against U.S. assets.
The latest Philadelphia Federal Reserve Survey of Professional Forecasters predicts U.S. third quarter gross domestic product growth dropping to an annual rate of 1.2 percent from the previous estimate of 1.7 percent.
MARKET MOVES
In U.S. trading the Dow Jones industrial average <
> was down 68.55 points, or 0.58 percent, at 11,713.80. The Standard & Poor's 500 Index <.SPX> was down 6.54 points, or 0.50 percent, at 1,298.78. The Nasdaq Composite Index < > was down 0.91 points, or 0.04 percent, at 2,439.04."The market has had a pretty good rally in the last few days. It got about 8 percent off the lows, so there's possibly some profit taking in the banking sector, with the lowering of earnings forecasts for Goldman Sachs," said Steve Goldman, market strategist at Weeden & Co in Greenwich, Connecticut.
JPMorgan said in a regulatory filing it expects continued deterioration in credit trends for its consumer portfolios and that could require additional allowances for loan losses.
UBS's worse-than-expected second quarter loss was the result of fresh write-downs and a wave of client withdrawals that prompted the bank to say it will split off its investment banking unit.
JPMorgan shares fell 6.18 percent in midday New York trade while UBS shares closed down 2.42 percent in Europe.
European shares closed down. The FTSEurofirst 300 index <
> of top European shares fell 0.33 percent to 1,208.89.Investors moved from stocks into the relative safety of government bonds, boosting the benchmark 10-year U.S. Treasury note 20/32 in price, pushing the yield down to 3.9219 percent.
Euro zone government bonds rose in thin trading conditions. Two-year bond yields <EUTYT=RR> eased 4.8 basis points on the day to 4.050 percent -- 20 basis points below the ECB's 4.25 percent benchmark interest rate -- while 10-year yields <EU10YT=RR> slipped 3.3 basis points to 4.233 percent.
Oil prices fell for a third straight session in seesaw trading as persistent concerns about slowing demand balanced against a stronger U.S. currency.
U.S. crude <CLc1> fell 87 cents a barrel to $113.58 despite concerns over supply disruptions stemming from the Russia-Georgia conflict. Oil is down from a peak on July 11 by more than 23 percent.
Gold prices fell to 8-month lows of $801.90 an ounce before recovering to $813.10, still below Monday's late New York trade of $819.25. The precious metal is down more than 20 percent since hitting a record high of $1,030.80 on March 17.
Japan's Nikkei <
> earlier closed down 127.31 points, or around 1 percent to end at 13,303.60, after rising 2 percent the previous day. The broader Topix < > shed 0.7 percent to 1,271.42. Companies linked to growth in emerging economies fell sharply on concern about slowing growth in China.China's main stock index sank to a fresh 19-month closing low on Tuesday. The Shanghai Composite Index <
> fell 0.52 percent to close at 2,457.198 points, extending Monday's 9.4 percent slide over the two previous trading days on concerns about corporate profit growth. (Additional reporting by Vivianne Rodriques, Ellis Mnyandu and John Parry in New York, Jeremy Gaunt in London, Samuel Chen in Shanghai. Editing by Richard Satran)