* Euro rises on cautious optimism over Irish budget
* Support likely to be fleeting, euro zone weaknesses remain
* Expectations for further Fed easing fuel risk appetite
(Adds quote, updates prices)
By Neal Armstrong
LONDON, Dec 7 (Reuters) - The euro rose on Tuesday on cautious optimism that Ireland will pass an austerity budget later in the day, but support for the single currency was expected to be fleeting as it is still dogged by structural weaknesses in the euro zone.
The dollar slipped against a currency basket after comments from U.S. Federal Reserve Chairman Ben Bernanke stoked expectations of prolonged easy U.S. monetary policy, supporting appetite for risk. [
]The euro remained vulnerable after euro zone policymakers failed to come up with new policies to tackle the region's debt crisis. [
] But an Irish Times report suggesting Dublin would pass an austere budget on Tuesday supported cautious investor optimism. [ ] [ ]"The euro is gaining some support on optimism that the Irish budget will be passed, but I expect any rallies to be fleeting. Structural weaknesses in the euro zone remain," said BTM-UFJ currency analyst Lee Hardman.
"It would be far more significant for the euro if the budget wasn't passed as this would bring down the Irish government and exacerbate concerns about the debt crisis spreading," he said.
At 1222 GMT, the euro <EUR=> was 0.4 percent higher on the day at $1.3363, after rising to $1.3394, more than 1 percent above Monday's low of $1.3246. Traders said strong demand from a UK clearer and Middle East accounts helped it to rally in European trade.
Euro/dollar volatility slipped on Tuesday, with one-month vols at 12.5 percent <EUR1MO=>, off nearly 6-month highs around 16 percent last week.
"Vols have come off but may stay stuck near current levels" because of risks of further euro declines, one London-based trader said.
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Take a Look on euro zone debt crisis: [
]Scenarios on euro zone crisis: [
]Graphics package on Europe's struggle with debt:
http://r.reuters.com/hyb65p
PDF on yuan offshore market: http://r.reuters.com/byg28q
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The picture was complicated by the dollar's own weakness after Bernanke did not rule out further bond purchases, sending the greenback to an 11-month low last month.
Analysts said the fact the Federal Reserve could end up buying more than its initial target of $600 billion in government bonds made investors more positive towards riskier assets and weighed on the dollar.
"The markets now think monetary policy will stay loose in 2011, and there's no reason to think abundant liquidity will die down soon," said Stephen Gallo, head of market analysis at Schneider Foreign Exchange.
"Risk appetite is up and the short U.S. dollar, long commodities trade still looks to have legs," he said.
The dollar fell 0.3 percent versus a currency basket <.DXY> at 79.324, while European stocks rose 1.2 percent <
>. Commodities firmed, with U.S. crude for January <CLc1> rising to a 26-month high above $90 a barrel. Gold hit record highs for the second day in a row. [The dollar was little changed at 82.56 yen, off a three-week low of 82.34. Support was at the bottom of the Ichimoku cloud at around 81.70.
The Australian dollar traded at $0.9952 <AUD=D4>, close to a three-week high of $0.9966. It dipped slightly after the central bank kept rates on hold at 4.75 percent and said inflation would be little changed over the next few quarters. The Aussie also recovered from losses on talk about Chinese monetary tightening.
The official Chinese Securities Journal reported China's central bank may raise interest rates this weekend to enshrine its shift to a "prudent" monetary policy in the face of rising inflation. [ID:nTOE6B6003]
Such speculation was offset somewhat after China's key short-term money market rate plunged from two-year highs. Big banks had previously been locking up large amounts of cash on expectations of a further increase in reserve requirements in coming weeks and more policy tightening next year, causing the benchmark seven-day repo rate to soar. [
] (Additional reporting by Tamawa Desai; Editing by Hugh Lawson)