(Yicai Global) Dec. 20 -- Stock markets on the Chinese mainland closed mixed after the morning session, with blue chips weighing down Shanghai and the emerging ChiNext index gaining slightly.

The Shanghai Composite Index fell 0.82 percent to 2,528.73 at the lunch break after traders swapped CNY56.1 billion (USD8 billion) worth of shares, while the Shenzhen Component Index hit the mid-day break at 7,398.38, down 0.27 percent with a trading volume of CNY71.3 billion.

The ChiNext Price Index, which tracks growth enterprises listed in Shenzhen, closed up 0.13 percent at 1,270.46, with investors trading CNY22 billion worth of shares.