The Sensex created history by crossing the 8,500-mark today.The index opened with a negative gap of 32 points at 8,413, and dipped to a low of 8,376 in morning deals. Then the mood turned, and there was no looking back....The index zoomed past the 8,500-mark to touch a historic high of 8,515 - an intra-day rally of 139 points. The Sensex finally closed on a bullish note at 8,500 - a gain of 55 points (0.66%).The sectoral indices closed on a mixed note. The BSE Bankex advanced over 2% (103 points) to 5,107. The BSE Teck index was up a per cent (21 points) at 2,165. The BSE Oil & Gas Index was up 0.87% (34 points) at 3,922.The BSE Consumer Durables Index declined 1.8% (48 points) to 2,620. The BSE Metal, Auto and Healthcare indices also declined.The board market mood, however, was extremely bearish - out of 2,667 scrips traded, 2,020 declined, 620 advanced and 27 were unchanged today.Infosys gained 2% (Rs 49) to Rs 2,497. While Satyam was up 2.6% (Rs 14) at Rs 555, TCS added Rs 17 to Rs 1,471.Reliance moved up 2% (Rs 14) to Rs 778. ONGC was up Rs 9 at Rs 1,030. ITC declined Rs 10 to Rs 1,929, and HLL was down Rs 2 at Rs 175.ICICI Bank advanced 4% (Rs 22) to Rs 578. HDFC Bank added 3% (Rs 20) to Rs 730. L&T added 1.6% (Rs 22) to Rs 1,403. BHEL gained Rs 16 to Rs 1,128.HDFC declined Rs 23 to Rs 1,029. Tata Steel, Wipro, ACC, Grasim, Bajaj and Bharti also declined.Reliance was the most active counter with a turnover of over Rs 269 crore followed by SRF (Rs 175 crore), Sesa Goa (Rs 116 crore), Satyam (Rs 102 crore) and Amar Remedies (Rs 95 crore).