The combined turnover of China's Shanghai and Shenzhen bourses reached 2.48 trillion yuan (about 350.74 billion U.S. dollars) in the morning session on Tuesday, nearing the 2.59 trillion-yuan historic high of full-day turnover recorded on Sept. 30.

China's major stock indices were higher after Tuesday morning, with the benchmark Shanghai Composite Index up 4.81 percent to 3,496.82 points at midday and the Shenzhen Component Index soaring 8.25 percent to 11,398.95 points.

The ChiNext Index, tracking China's Nasdaq-style board of growth enterprises, jumped 14.26 percent to reach 2,485.34 points at the conclusion of the morning session.

The ChiNext Index, together with the Shenzhen Component Index and other indices, reflects the performance of stocks listed on the Shenzhen Stock Exchange.