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| Titel: |
Galena lead isotopes from the eastern part of the Nabberu Basin, Western Australia |
| Auteur: |
Richards, J. R. Gee, R. D. |
| Verschenen in: |
Australian journal of earth sciences |
| Paginering: | Jaargang 32 (1985) nr. 1 pagina's 47-54 |
| Jaar: |
1985-03 |
| Inhoud: |
Pb isotope assays are reported for galena found in undeformed stromatolitic dolomite of the eastern Earaheedy Sub-basin of Western Australia. This sequence comprises the youngest group of sedimentary rocks in the Nabberu Basin, and lies directly on rocks of the Yilgarn Block. Two of three hand-specimens yield concordant ratios and a model age in reasonable agreement with the 1.7 Ga K-Ar dates on stratigraphically related glauconites. The Earaheedy Group and its iron formations can not therefore be correlated with the significantly older (2.5 Ga) Hamersley Group. The third hand-specimen is isotopically heterogenous. Regression through the data indicates a source region of age similar to the youngest components of the underlying Yilgarn Block. Derived parameters suggest the high source-U/Pb typical for the NW of Western Australia in this age range, and a less usual low source-Th/U. By contrast the added radiogenic component revealed in the third specimen suggests an unusually high Th/U for its source rock. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 2 van 8 gevonden artikelen
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