Bain, who wanted the council to initiate a poll before making a decision, unsuccessfully tried to move an amendment to what became the final decision. Cr Blaikie seconded the amendment, voting in favour of it along with Crs Kitchen and Stolwerk, but Crs Smart, Craw, Macdonald, Robinson and Yeoman opposed it.
Bain announced his resignation at 11.25am, saying he did not want to be part of a "broken democracy."
"There's no point me sitting through the rest of the agenda, no point in staying. I take my departure," he said, handing a letter of resignation to Smart and leaving the room.
He had argued that it was for the community, not the council, to decide on the matter, and that he would accept whatever decision the community made.
Smart did not accept Bain's resignation, leaving it to lie on the table for two weeks, and declined to comment further after the meeting. Bain, however, said he was comfortable with his decision, made on a matter of principle about the democratic process and not singling out any particular race.
NRC's Tai Tokerau Māori and council working party (TTMAC) has asked the council to work with the Prime Minister and Local Government New Zealand to change the Local Electoral Act provision requiring polling.
TTMAC co-chairman Cr Robinson said Māori constituencies were an important part of doing the best for Northland as a whole, Smart saying the decision first and foremost honoured councils' requirement to honour the principles of the Treaty of Waitangi in its participation with Māori.
"No Pākehā can have a Māori world view," she said.
Māori had not changed their priorities around the treaty. It was up to Pākehā to change their view, and central government had given clear messages around its wishes for increased Māori participation in local government.
Cr Macdonald said the council had a clear mandate via local government legislation, and it was important to have the constituencies to boost economic, social, cultural and environmental wellbeing for Māori.
New Zealand had just been through a general election that resulted in landslide change, Cr Yeoman said, and Māori seats were "part and parcel" of that change. She had no idea why that wasn't being replicated in local government.
"There is nothing to fear with this decision. It's just the right bloody decision, so let's just do it. Māori are not a minority, they signed the Treaty of Waitangi, a founding document for our country," she said.