Wall Street’s main indexes tumbled at opening bell Monday, as concerns about the pace of economic recovery, mixed with fears about financial contagion from China’s Evergrande troubles, put selling pressure on risk assets. At opening bell, the Dow Jones Industrial Average fell 125.16 points, or 0.36 percent, to 34,459.72. The S&P 500 opened lower by 30.04 points, or 0.68 percent, at 4,402.95, while the Nasdaq Composite dropped 285.83 points, or 1.90 percent, to 14,758.14. By 11:06 a.m. New York time, the Dow was trading down around 490 points, or 1.42 percent, the S&P 500 was trading down around 71 points, or 1.61 percent, and the Nasdaq was lower by around 318 points, or 2.1 percent, according to Tradingview.com market data. The VIX volatility index, dubbed the Wall Street fear gauge, had spiked by 4.86 points, or 23.35 percent by 9:52 a.m., while U.S. Treasurys and gold saw inflows of capital, …