Supporters and opponents of same-sex marriage have clashed outside a Brisbane church following the High Court decision allowing a postal vote to go ahead.

Police say one woman was arrested for obstructing police and another person suffered a minor injury during the angry stand-off outside the Ashgrove church on Thursday night.

Supporters and opponents of same sex marriage have clashed outside a Brisbane church following the High Court decision allowing a postal vote to go ahead. Credit:Nine News

Cabinet minister Peter Dutton told the Nine network the incident does not reflect the respectful debate the government wants on marriage reform.

"Of course it's not. Conduct yourself in a reasonable way. Have a respectful discussion," he urged during an interview on the Nine Network.