Investors wealth was today eroded by Rs 4.6 lakh crore amid massive selling in the stock market where the BSE benchmark index plummeted 840 points. The 30-share Sensex crashed 839.91 points, or 2.34 percent, to end the day at 35,066.75. Following the sharp decline in stocks, the market capitalisation of BSE-listed companies tumbled Rs 4,58,581.38crore to Rs 148,54,452 crore.