The father, who cannot be named to protect the girl's identity, was found guilty of procuring a child under the age of 14 for unlawful sexual activity and encouraging the pair to have intercourse despite denying the charges.
Sydney's Downing Centre District Court heard that he wanted to save the girl from what he considered the sin of having sex outside marriage so when she reached puberty he decided she should wed.
On the night of the wedding -- which was not recognised under Australian law -- the married pair went to a hotel with the father's permission, Judge Deborah Sweeney said as she handed down her judgment.
They had sex there and twice more at the father's home the following weekend.
"He made up a room and bed... For them knowing they would have sexual intercourse," Sweeney said, adding that the girl fell pregnant but miscarried.
The father was released on bail and will be sentenced next month.
His daughter is in the care of authorities while the "husband" was jailed for seven-and-a-half years last month for sexual abuse of a child. The sheikh who carried out the marriage ceremony has not been charged.
