By Carla Mozee, MarketWatch LOS ANGELES (MarketWatch) -- Stocks in the materials and industrial sectors dropped Friday, sharpening losses in Latin American equities, as a rebound in the U.S. dollar pressured energy prices. Brazil's Bovespa lost 1.6% to end at 65,058.84, logging a 1.7% weekly decline. Market heavyweight Petrobras (PBR 49.59, -0.75, -1.49%) shares fell 1.4% and mining giant Vale (VALE 26.95, -0.25, -0.92%) gave up 1.7%, moving lower alongside shares of steel maker Gerdau (GGB 16.90, -0.35, -2.03%) and Usiminas. Gerdau slid 3% and Usiminas lost 1.9%. Petrobras was also in focus Friday, as the oil firm sold $4 billion in global notes to pay back debt from a $6.5 billion bridge loan. The company in a statement said it sold $2.5 billion in 10-year bonds, and $1.5 billion in 30-year bonds. Mexico's IPC fell 0.5% to 30,617.68, with shares of copper miner Grupo Mexico (MX:GMEXICO B 28.43, -0.15, -0.52%) off 0.5% and mining concern Industrias Penoles down 3.8%. Cement maker Cemex (CX 12.80, +0.03, +0.24%) dropped 2.3%. The index shed 0.4% for the week, in part as investors kept watch on Mexican congressional developments related to the 2010 budget. Mexican and Brazilian stocks erased their earlier advances as losses on Wall Street accelerated. U.S. stocks were pulled lower by industrial and commodity-related stocks as oil prices declined and metals traded mixed while the U.S. dollar fought against 14-month lows to rise against its major rivals. The dollar index (DXY 75.47, +0.37, +0.50%) rose 0.5% to 75.46. Crude-oil prices fell 0.8% to $81.19 a barrel on the New York Mercantile Exchange, pulling back from an intraday high of $81.78. But oil prices, as gauged by Nymex front-month contracts, finished the week up 3.4%. See full story. Silver and copper prices each rose at least 1% while gold futures shed 0.2%. Argentina's Merval fell 0.6% to 2,292, but pared deeper losses. Buenos Aires-listed shares of Petrobras lost 1.5%, Petrobras Energia (PZE 18.26, -0.25, -1.35%) fell 1.6% and Tenaris (TS 40.23, -0.01, -0.03%) , maker of steel tubes used by the oil industry, slumped 1.1%. The Merval climbed 4% on a weekly basis. Chile's IPSA index, meanwhile, outperformed its regional peers with an advance of 0.2% to 3,421.95. For the week, it shed 0.7%. On Wall Street, the S&P 500 Index (SPX 1,080, -13.31, -1.22%) slid 1.2% and the Dow Jones Industrial Average (INDU 9,972, -109.13, -1.08%) dropped 109 points, or 1.1%, to 9,972.

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