Asian shares head for worst quarter in over 5 years

HONG KONG (Reuters) - Asian shares fell on Monday, heading for their worst quarterly performance in over five years, on persistent concerns about the global credit crunch and the impact of weakening U.S. consumer demand on the region's exports. 

Oil prices, among the top performing asset classes so far this year, extended falls from the previous session after the restart of a crude pipeline system in Iraq eased concerns over supply.

A choppy dollar kept other commodity prices steady, following a quarter in which a slumping U.S. currency has sent the prices of asset classes such as gold to record highs.