* FTSE 100 falls 1 percent; back below 6,000 level
* Miners fall after Alcoa revenue misses forecasts
By Tricia Wright
LONDON, April 12 (Reuters) - Britain's top share index fell on Tuesday, pressured by falls in mining firms in response to disappointment over earnings from Alcoa <AA.N>.
By 1113 GMT, the FTSE 100 <
> was down 57.98 points, or 1 percent, at 5,995.46, after ending almost flat on Monday.The index is heading for its lowest close since early March.
"Investors are looking at where we've been over the course of the past few months (from a global perspective), and they're saying it's going to be hard to maintain this kind of strength going forward, Peter Dixon, an economist at Commerzbank, said.
"(Elevated oil prices) could be another factor which acts as a brake -- at a time when central banks are beginning to think about, if not actually, tightening monetary policy."
But Dixon added that he remained bullish on U.S. earnings, and while UK domestic corporate results "might be a different story", the general trend for many key markets is that earnings are expected to perform "moderately well".
Miners <.FTNMX1770> dropped after aluminium maker Alcoa Inc <AA.N> reported a first-quarter revenue that missed forecasts [
]. Copper prices fell in response to Japan's worsening nuclear crisis and aftershocks which have weakened prospects for economic recovery and metals demand growth in the world's third-largest economy. [ ]With investors' confidence undermined, traders noted a flow into defensively perceived stocks such as tobaccos, pharmaceuticals, and utilities.
Drugmakers Shire <SHP.L>, AstraZeneca <AZN.L> and GlaxoSmithKline <GSK.L> were near the top of the FTSE 100 leader board, up 1.1 percent, 0.9 percent, and 0.8 percent.
A note from Charles Stanley described the broader technical picture for GlaxoSmithKline -- which hit its highest closing level on Monday since January after rallying strongly from a March low of 1,127.50 pence -- as "encouraging".
"The price action of the last few months suggests that the double-bottom has formed in the region of 1,128 pence, while the magnitude of this pattern is indicating that there is still room for further upside in the near term," the broker said.
The same broker also highlighted United Utilities <UU.L>, saying that a recent show of strength had lifted the stock up to a level where resistance has kicked in, and "in the event that resistance is exceeded we should expect to see a run back up to the highs, in the region of 634 pence", it said.
Some weakness was seen among retailers after the British Retail Consortium said UK retail sales fell at their fastest annual pace in nearly six years in March as high inflation and low wage growth dragged down consumer spending.
Next <NXT.L> slipped 0.3 percent, while Marks & Spencer <MKS.L> dropped 0.2 percent.
British inflation eased in March for the first time since last summer as grocers cut food prices, providing the Bank of England with some leeway to hold interest rates steady to support the still shaky economy.
Cruise operator Carnival <CCL.L> and International Consolidated Airlines Group <ICAG.L> were the top blue-chip risers, both up 3.1 percent, as Brent crude <LCOc1> retreated from a 32-month high of $127.02 a barrel hit on Monday.
Technical analysis for the FTSE 100 showed that overall, the main trend is decisively higher.
"The series of higher-tops and higher-bottoms suggests that traders are preventing the market from overheating by backing off at new highs, but maintaining the uptrend by stepping in on breaks at value areas," James Hyerczyk, an analyst at Autochartist, said.
"This pattern is likely to continue until the market tests the high for the year at 6,105.77." (Editing by Jane Merriman)