Nothing could split the sides in the first half but the Rangers, who finished runners-up for the second year in a row, could not contain the offensive strength of the Marlins, who had five players score 16 points or more.
Cairns Taipans National Basketball League stars Aaron Grabau and Gary Boodnikoff netted 24 points and 23 points respectively to lead the Marlins with Grabau going on to be named Grand Final MVP.
Future Australian Boomer Nathan Jawai also chipped in with a 21-point, 13-rebound double-double and proved to be the difference in the decisive third quarter.
Australian Opal Rohanee Cox was outstanding for Townsville, netting a game-high 30 points while Townsville Fire Women's National Basketball League guard Celeste Heilbronn added 21 points and 9 rebounds in support.
The Broncos were missing Opal Sharin Milner and Under 21 World Championship silver medalist Elyse Penaluna through injury and couldn't match the offensive power of the Flames.