By Carla Mozee, MarketWatch European oil E&P has fallen roughly 35% this year

LONDON (MarketWatch) -- European stocks fell Monday, with shares of miners struggling after soft economic data from China, and as oil stocks continue to grapple with a stunning slide in oil prices.

Investors also weighed a new round of European economic data, highlighted by further slowing in manufacturing activity in the eurozone. Data firm Markit said its monthly survey of purchasing managers fell to 50.1 in November, down from a preliminary estimate of 50.4. The data come as European Central Bank officials have indicated they may ramp up stimulus efforts to battle low inflation and stagnating economic growth.

Markets: The Stoxx Europe 600 index fell 0.5% to 345.64, with oil companies populating the index's list of the biggest share-price decliners, still feeling the weight of a decision Thursday by the Organization of the Petroleum Exporting Countries not to cut production, at a time when the sector is dealing with oversupply. U.S. crude-oil futures (CLF5) were slightly higher Monday, although the $67-a-barrel level still represents a more than four-year low for crude prices.

J.P. Morgan Cazenove said oil and gas producer Afren PLC is among the companies whose shares are the most heavily exposed to the decline in oil prices. It cut Afren to an underweight rating from overweight, prompting Afren shares to drop 11.8%, leading decliners on the Stoxx Europe 600. Tullow Oil PLC fell 6% as its rating was cut to neutral from overweight.

The European oil exploration and production space has fallen roughly 35% this year, tracking the recent sharp slide in the oil price, and "while this has been an uncomfortable ride, downside risks remain, in our view," said analysts at J.P. Cazenove, in an note Monday.

The sector is likely to face oil prices hovering below $90 a barrel for at least the next six to 12 months, or longer, and the weaker prices come at a time that "balance sheets are more stretched than at any point in recent memory given investments in projects sanctioned with $100 a barrel in mind", the analysts added.

Oil stocks joined miners in slumping after two measures of manufacturing activity in China -- a key buyer of commodities -- indicated further weakness in the world's second-largest economy. HSBC early Monday said its China purchasing managers index fell to a six-month low of 50.0. Meanwhile, China's official PMI fell to 50.3, the lowest level since March.

Among miners, iron-ore heavyweight BHP Billiton PLC (BHP) shares fell 2.2%, Anglo American PLC dropped 1.3% and Rio Tinto PLC gave up 1.2%.

But winners in session included shares of E. ON SE , climbing 4.2% as the German utility announced plans to split into two companies.

Stock in Altice SA topped the Stoxx 600 with its gain of 8% after the company agreed to purchase Portuguese telecom assets from Brazil's Oi for about 7.4 billion euros ($9.24 billion).

Germany's DAX 30 fell 0.2% to 9,963.51, and France's CAC 40 index lost 0.3% to end at 4,377.33. The U.K.'s FTSE 100 index declined 1% to 6,656.37. Italy's FTSE MIB index shed 1.6% to 19,686.45 following confirmation that Italian gross domestic product slipped back into recession in the third quarter.

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