I've seen many papers and sites that give the dating of Australia's Dresser Formation as 3.5 Ga (variously 3.48 or 3.49 Ga), but I can't seem to find the source of this.
Where does the dating come from, and what is it based on?
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Sign up to join this communityFrom Australian Government- Geoscience AustraliaAustralian Stratigraphic Units Database:
Panorama Formation: Paleoarchean min age: 3427 MA Age method: isotopic, U/Pb-Pb/Pb ion probe
Dresser Formation: Min Age: Ma: 3477 Age method: inferred, overlying unit
McPhee Formation: Min Age: 3477 Age method: isotopic, U/Pb-Pb/Pb ion probe
A Pb–Pb isochron age of 3490 Ma was obtained from galena in barite of the chert–barite unit at North Pole (Thorpe et al., 1992b).
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– plannapus
Sep 20 '17 at 9:10
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And a few references in..http://geodocs.dmp.wa.gov.au/viewer/multipageViewerAction.do?documentId=440287&viewMarkId=0&ct=true&at=none&btv=true&atv=false&vmtv=false&ac=ff0000&cabinetId=1101&pg=0&scl=64&bds=0|0|2560|3584