China stocks slump again in absence of govt support; Hong Kong rebounds
* CSI300 -3.9 pct; SSEC -4.3 pct; HSI +1.6 pct
* Shanghai index a touch above 3,000 support level
* Margin lending in Shanghai falls for 5th day in a row
SHANGHAI, Aug 25 (Reuters) - China stocks slumped about 4 percent on Tuesday, touching eight-month lows, as investors dumped shares after a grim "Black Monday" that battered global markets but failed to prompt fresh rescue measures from Beijing.
After opening 6.4 percent lower, the Shanghai Composite Index trimmed some losses to end the morning down 4.3 percent at 3,071.06 points.
The Shanghai index is now just a touch above 3,000 points, seen by many as a key psychological support level, a breach of which could trigger fresh panic selling.
The blue-chip CSI300 index fell 3.9 percent, to 3,147.76 points, also paring some of its losses when trading opened.
The flagship indexes, which have lost more than 16 percent in August, are heading for their worst monthly performance in six years, barring a sharp rebound in the final days.
Hong Kong stocks fared better than mainland ones on Tuesday. Continuación...