Australia shares trim gains after weak China data, resources firms shine

* Pares gains after poor Chinese data

* Metals and energy shares top performers

* Index on track to end week in black

* 103 shares up, 86 down and 11 unchanged (Adds analysis, quotes, stocks on the move)

By Pauline Askin and Naomi Tajitsu

SYDNEY/WELLINGTON, Aug 28 (Reuters) - Australian shares trimmed early gains on Friday after weak data from China kept alive worries about slowing momentum in its economy, though a rally on Wall Street and a rebound in commodities helped drive energy and materials sectors higher.

The S&P/ASX 200 index rose 0.7 percent, or 33.77 points, to 5,266.5 by 0233 GMT, but pulled back from a 1.4 percent jump in morning trade.

It (Other OTC: ITGL - news) marked the fourth straight day of rises for the index, which gained 1.2 percent on Thursday. After a tumultuous start to the week when global markets were rocked by turmoil in Chinese equities, the index is on track for its first percentage gain in three weeks.

"We are going to get much more volatility, certainly in the short term," said Ben Le Brun, market analyst at OptionsXpress.

In Asia, stocks extended a rally on Wall Street after upbeat U.S (Other OTC: UBGXF - news) . economic data helped calmed nerves rattled by fears of a hard landing for China's economy.

China, a major market for Australian exports, remained a major focus for investors after policy makers launched a barrage of stimulus measures this week.

Data earlier on Friday showed profits earned by Chinese industrial companies declined 2.9 percent in July from a year ago, highlighting weakening momentum in the world's second-biggest economy.

Mining companies were among the top performers with Fortescue Metals (Dusseldorf: FVJ.DU - news) jumping 7.8 percent while major miners BHP Billiton (NYSE: BBL - news) and Rio Tinto (LSE: RIO.L - news) rose 5.7 percent and 3.8 percent respectively.

Energy stocks such as Beach Energy (Dusseldorf: BPS.DU - news) and Drillsearch were boosted after oil prices rose by over 10 percent.

Major banks Westpac, NAB and Commonwealth Bank reversed their gains to fall 0.2-0.5 percent.

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New Zealand's benchmark NZX50 share index rose 36.54 points or 0.65 percent to 5,671.44, pushing further away from a near eight-month closing low plumbed earlier this week, as investors picked up healthcare and industrial firms, some of which had sold off sharply in past days.

Ebos rose 0.8 percent, bolstered after the pharmaceuticals and pet care supplier reported a record annual profit earlier in the week.

Auckland Airport rose 0.4 percent as investors bought the operator of the country's largest airport on dips after it slumped to a three-month low of NZ$4.75 earlier in the week.

Mighty River Power (Stuttgart: MRY.SG - news) rose 1.7 percent, boosted after the power retailer announced a special dividend for the year just ended even as net profit fell. (Additional reporting by Swati Pandey; Editing by Shri Navaratnam)