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SHANGHAI, Dec 4 (Reuters) - China stocks fell on Friday as investors grew cautious after four straight days of gains, and Hong Kong shares followed in a broad-based morning sell-off.
That still leaves markets up for the week so far but still short of recovering from a sharp crash last Friday which left benchmark indexes down around 5 percent for the week.
The CSI300 index fell 1.4 percent, to 3,696.80 points at the end of the morning session, while the Shanghai Composite Index lost 1.2 percent, to 3,542.13 points.
China CSI300 stock index futures for December fell 1.7 percent, to 3,627.2, 69.60 points below the current value of the underlying index.
The sell-off was led by index heavyweights in finance and property sectors, but some small caps rallied as investors shifted out of blue chips into the ChiNext growth board index .
China will officially launch a "circuit-breaker" mechanism for the country's benchmark stock indexes after the New Year holiday in January, respected financial magazine Caixin reported on its website, citing regulatory sources.
The Hang Seng index dropped 1.1 percent, to 22,164.88 points, led by the Hong Kong China Enterprises Index which lost 1.6 percent, to 9,832.59.
The index measuring price differences between dual-listed companies in Shanghai and Hong Kong stood at 141.39.
A value above 100 indicates Shanghai shares are pricing at a premium to shares in the same company trading in Hong Kong, and vice versa.
The northbound quota for the Hong Kong-Shanghai Stock Connect, currently set at 13 billion yuan, saw net outflows of 0.07 billion yuan.
Total volume of A shares traded in Shanghai was 13.99 billion shares, while Shenzhen volume was 15.19 billion shares.
Total trading volume of companies included in the HSI index was 0.5 billion shares.
Reporting by Pete Sweeney; Editing by Jacqueline Wong