UPDATE 6-Gold ends down as dollar up on U.S. home data

* Gold dented as dollar rises after US home data, Trichet

* Oil climbs nearly $2 a barrel on supply concerns

* Platinum, palladium lower after turbulent trade (Recasts, updates with quotes, closing prices, market activity, adds NEW YORK to dateline)

By Frank Tang and Jan Harvey

NEW YORK/LONDON, Aug 7 (Reuters) - Gold ended lower on Thursday as the dollar rebounded against the euro after a surprise rise in June U.S. home sales and comments by European Central Bank President Jean-Claude Trichet.

Platinum retreated after a rise in prices fueled by strike action in South Africa on Wednesday ended a three-session slide that drove prices down some $180 an ounce to six-month lows.

Gold <XAU=> ended at $871.05/872.45 an ounce by New York's last quote, down from $878.70/879.90 late on Wednesday. Earlier this week the precious metal dropped to a seven-week low as part of a broader commodities sell-off fueled by a firmer dollar.

The U.S. dollar rose to a 5-1/2-month high against a basket of currencies and a seven-week peak versus the euro, bolstered by a surprise rise in June home sales and diminished expectations for euro-zone interest rate increases.

"There is less and less likelihood that the ECB will hike rates ... and, of course, that is weighing on the euro," said Dresdner Kleinwort consultant Peter Fertig. "(That) leads to a firmer U.S. dollar, which is negative for gold."