Nov 5 (Reuters) - Canada’s main stock index opened higher on Thursday, led by a surge in the materials sector, while upbeat earnings from Canada Tire Corp Ltd and Canada Goose Holdings Inc further lifted sentiment. * At 9:31 a.m. ET (14:31 GMT), the Toronto Stock Exchange’s S&P/TSX composite index was up 237.74 points, or 1.49%, at 16,236.48.