(Yicai Global) Oct. 13 -- Shanghai's main stock benchmark slid in the morning session, weighed down by the financial sector as a big brokerage merger fell through, while Shenzhen's major indexes were more resistant and even rose.

The Shanghai Composite Index declined by 0.28 percent to 3,348.90. The Shenzhen Component Index was at 13,733.17, up 0.18 percent. The ChiNext Price Index, which tracks growth enterprises in Shenzhen, climbed 0.19 percent to 2,782.64.

Securities brokers plunged after Guolian Securities and Sinolink Securities said that they will not be merging after the main securities regulator started looking into how information about the planned business consolidation reached the markets before the official announcement. Guolian [SHA:601456] tumbled more than 5 percent and Sinolink [SHA:600109] surged more than 5 percent.

Editor: Emmi Laine