(Updates to close)
Feb 23 (Reuters) - Australian shares ended lower on Thursday, heavily pulled down by the materials sector, with Rio Tinto (LON:RIO) RIO.AX slumping after trading ex-dividend.
The S&P/ASX 200 index .AXJO was off 0.4 percent, or 20.399 points, at 5,784.7 by the close of trade. The benchmark ended 0.2 percent up in the previous session.
The S&P/ASX 200 materials index .AXMJ fell nearly 2 percent, with shares of Rio Tinto, the world's second-largest miner, facing their biggest fall in eight months.
BHP Billiton (LON:BLT) Ltd BHP.AX slid 2.7 percent, its second straight day of losses, as copper prices drifted lower.
London copper prices slipped on Thursday, with the U.S. dollar firming as the market reassessed minutes from the Federal Reserve's last policy meeting that kept the prospect of a March rate hike in play. Ltd S32.AX fell 3.9 percent while Fortescue Metals Group Ltd FMG.AX dropped to a more than one-week low.
The worst performer on the main index, however, was Ardent Leisure Group AAD.AX plunging to a more than three-year low after it posted a half-year net loss of A$49.4 million, hurt by sales of health clubs as well as a ride accident at its Dreamworld theme park in October. Zealand's benchmark S&P/NZX 50 index .NZ50 closed 0.4 percent higher, or 27.04 points, to finish the session at 7,089.52.
Healthcare, industrial and material stocks led the gains with Fisher & Paykel Healthcare Corp FPH.NZ and Fletcher Building Ltd FBU.NZ rising 1.7 percent and 1.2 percent, respectively.
Air New Zealand Ltd AIR.NZ hit more than a five-week high after it reported first-half profit decline but provided a bright outlook that it expects a reduction in flights by Chinese competitors. = 1.3016 Australian dollars)