Contact the Clerk of the Superior Court in the county where the marriage certificate was filed.
The Archives marriage record and divorce record holdings range from 1864-1972 and vary by county. You are welcome to submit a question about coverage to the Archives here. The types of marriage records available may include:
Above image: Consent form
Above image: Marriage affidavit
Above image: Marriage Certificate
The Archives holds indices for many of the civil divorce cases. Researchers can locate case numbers and files by name. Case files include complaints, judgments, and other documents filed with the court. The majority do not include transcripts.
You can use the register of action to trigger a newspaper search based on the dates listed. This could lead to other sources of information.
Image: Pima County, Superior Court, Civil Cases. Volume 009. Archives and Records Management Division. Arizona State Library, Archives and Public Records.