By Carla Mozee, MarketWatch

LONDON (MarketWatch) -- U.K. stocks turned slightly higher Monday, finding some relief after a string of selloffs knocked the FTSE 100 benchmark to its lowest level in a year.

The benchmark index edged up 0.1% to 6,346.97 in morning trade after opening lower. Stocks in Europe and in other markets worldwide have been beaten down in recent sessions on heightened worries about slowing global growth.

The materials sector on Monday was higher as mining issues advanced. Shares of Rio Tinto PLC (RIO) climbed 2.2% after Barron's over the weekend said the stock could rise 20% in the next 12 months, even without a merger with Glencore PLC . Rio Tinto earlier this month confirmed it had rejected a takeover proposal from Glencore in July.

Anglo American PLC rose 2.5% following an upgrade at Credit Suisse. Randgold Resources was up 2.3%, and United Utilities Group PLC gained 1.2%.

But the FTSE 100 breaking "below the trend line support from the March 2009 lows is something of an alarm," said Brenda Kelly, chief strategist at IG, in emailed comments. "The 5 1/2-year bull market now looks threatened," she said.

Chip designer ARM Holdings PLC fell 1.7%, losing ground alongside Infineon Technologies AG and STMicroelectronics NV after they were downgraded to neutral from overweight at J.P. Morgan Cazenove. Semiconductor-related stocks logged big losses on U.S. markets on Friday, after Microchip Technology Inc. (MCHP) warned the chip sector may be in store for a downturn.

Shares of Smith & Nephew PLC gave up 0.9% after the company said top-line results from a late-stage trial of HP802-247, a living cell spray-on therapy to help healing of venous leg ulcers, didn't meet the primary endpoint. TUI Travel PLC fell 1.2%.

On Monday, the U.K. government made its first move in its planned sale of its 40% stake in Eurostar, the train operator for the Channel Tunnel. It has set an Oct. 31 deadline for "expressions of interest" from potential buyers.

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