GLOBAL MARKETS-Equities selloff steepens, dollar slips as growth woes eyed

* Wall St indices drop 2 percent* Treasuries yields touch recent record lows* Brent oil at two-year lows under $90 a barrel* Gold up for fourth day(Adds closing New York prices, quotes)By Michael ConnorNEW YORK, Oct 9 (Reuters) - Wall Street stocks slumped 2 percent on Thursday as anxieties about global economic growth smothered a short-lived rally in equity markets around the world that was spark