Age constraints on recycled crustal and supracrustal sources of Archaean metasedimentary sequences, Eastern Goldfields Province, Western Australia: evidence from SHRIMP zircon dating

SHRIMP U-Pb zircon dating of sedimentary, volcanic and subvolcanic-intrusive rocks from unconformity bounded sequences in the Eastern Goldfields province defines maximum depositional ages for those sequences, The Kambalda Sequence, which records a backarc basin, was deposited prior to 2700 Ma and from at least 2715 Ma. The Spargoville Sequence, which records an are-adjacent, volcano-bound basin, was deposited between 2700 and 2683 Ma. The Kalgoorlie Sequence, which records an intra-are rift basin, comprises two tectonic stages with depositional ages of 2681-2670 and 2661 -2655 Ma. Deposition of the Spargoville and Kalgoorlie Sequences overlapped with the intrusion of granitoids, and subvolcanic porphyries, thereby indicating that those granitoids were emplaced during crustal extension. Younger, submarine-fan (Kurrawang Sequence) and braided-fluvial ( Merougil and Jones Creek Sequences) deposits of a remnant-ocean basin were deposited at