GENEVA, Nov. 24 (Reuters) - Iran is expected to get limited sanctions relief on gold, petrochemicals and autos as part of an agreement under which it will curb its atomic program, a Western diplomat said on Sunday.

The diplomat provided no further details of the agreement, which was struck after four days of negotiations between Iran and six major powers: Britain, China, France, Germany, Russia and the United States. (Reporting By Arshad Mohammed)