(Adds close of U.S. markets)
* MSCI world, Wall Street indexes post fresh records
* Oil slips on doubts trade pact to spur global growth
* Dollar weakens, gold edges higher
By Herbert Lash
NEW YORK, Jan 15 (Reuters) - Key world equity indexes climbed to new records on Wednesday on hopes a U.S.-China trade deal will reduce harmful tensions, but oil prices slid on doubts the pact will spur world growth and boost crude demand.
U.S. President Donald Trump and Chinese Vice Premier Liu He signed a Phase 1 deal that will roll back some tariffs and see China boost purchases of U.S. goods and services, defusing a prolonged conflict between the world's two largest economies.
Liu said in remarks at the White House that the United States and China need to step up cooperation, and that the deal benefits both countries and the world. The deal capped an 18-month dispute that had roiled markets.
The centerpiece of the deal is a pledge by China to purchase at least an additional $200 billion worth of U.S. farm products and other goods and services over two years, over a baseline of $186 billion in purchases in 2017.
MSCI's all-world stock index and the three major indexes on Wall Street set record intraday highs. The MSCI benchmark, along with the Dow and S&P 500, also posted record closing highs, while the Dow closed above the 29,000 mark for the first time.
The deal is unlikely to significantly change the growth outlook, but it should allow companies to make the capital investments they have not, which is positive, said Marvin Loh, senior global macro strategist at State Street Global Markets.
"What's most important to investors is a potential de-escalation and signs that de-escalation will continue this year, which is the outlook period for a lot of investors," he said.
"If we can somehow take this out as one of the bigger risks that we had all last year, it does give some confidence to the market. Not necessarily from an economic but from a risk parameter perspective," Loh said.
MSCI's gauge of stocks across the globe gained 0.07%. Earlier in Europe, the pan-regional STOXX 600 index closed up 0.1% while MSCI's broadest measure of Asia-Pacific markets outside Japan closed down 0.35%. Japan's Nikkei lost 0.45%.
On Wall Street, the Dow Jones Industrial Average rose 90.55 points, or 0.31%, to 29,030.22. The S&P 500 gained 6.14 points, or 0.19%, to 3,289.29 and the Nasdaq Composite added 7.37 points, or 0.08%, to 9,258.70.
Emerging market stocks lost 0.53%.
Oil prices slipped on concerns the trade agreement may not provide much of a demand boost because the United States intends to keep tariffs on Chinese goods until a Phase 2 deal is reached.
Prices were also under pressure from a report by the Organization of Petroleum Exporting Countries. OPEC expects lower demand for its oil in 2020 even as global demand rises, as rival producers grab market share and the United States looks set for another output record.
Brent crude fell 49 cents to settle at $64.00 a barrel. U.S. West Texas Intermediate crude futures settled down 42 cents at $57.81 a barrel.
The dollar pared losses but remained lower against the euro and the yen after the signing of a trade deal that may prove a mild negative for the greenback as it removes uncertainty.
The dollar index, tracking the unit against six major peers, fell 0.14%, with the euro up 0.18% to $1.1147.
U.S. Treasury yields declined as investors repositioned around new data showing producer prices barely rose in December.
A rise in the cost of goods was offset by weakness in services, the latest indication of tame inflation pressures that could allow the Federal Reserve to stand pat on interest rates this year.
Benchmark 10-year notes last rose 9/32 in price to push its yield lower to 1.7864%.
In Europe, investors flocked to new fund raisings by Italy and Belgium a day after Spain saw record demand.
The 10-year German bond yield fell 3 basis points to -0.201%, not too far from the more than six-month highs of -0.157% touched at the start of January.
U.S. gold futures settled up 0.6% at $1,554 an ounce.
Additional reporting by Tomo Uetake in Tokyo; Editing by Bernadette Baum, Nick Zieminski and Richard Chang