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- W156968097 abstract "values ( 176 Hf/ 177 Hfi), 0.27976 ± 13 (2σ) and 0.28020 ± 8 (2σ) [2]. These results correlate with the petrographic observation that this sample had a complex thermal history [1]. To better define the internal isochron for this rock and to better constrain the Solar System initial 176 Hf/ 177 Hf value, we separated unradiogenic ilmenite and zircon from the sample. Methods: Zircon and ilmenite were separated from about 6.7 g of cleaned and crushed sample. These minerals were concentrated with a selective acid digestion procedure using HF-HNO3HCl. Via handpicking, a pure ilmenite and an ilmenite-zirconmixture mineral fraction were separated. Chemical separation and isotope analysis procedures were those of [3] and [4]. Samples were analyzed for their Lu-Hf isotopic composition using an IsoProbe MC-ICP-MS. The accuracy and 2 s.d. external precision of Hf isotope analyses as a function of Hf concentration were evaluated by repeated measurement of standard solutions at different intensities [5]. Ages were calculated using a decay constant of 1.867 × 10 -11 year -1 for 176 Lu (e.g., [3,6]). Results and Conclusion: The ilmenite fraction lies above the older, 4.68 Ga isochron at low Lu/Hf. The ilmenite+zircon fraction, together with the whole rock and three pyroxene fractions lie on a 4.61 ±0.11 Ga trend. Although this is within error of the expected age of the sample, the initial 176 Hf/ 177 Hf of 0.279832 (77) is higher than that of some other eucrite isochrons. This may suggest that ilmenite in the ilmenite+zircon fraction either partially re-equilibrated isotopically during a heating event or it lost some Lu during the selective digestion procedure. In either case, it seems that a pure zircon fraction, if recovered, might yield a somewhat lower initial 176 Hf/ 177 Hf than the value reported here." @default.
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- W156968097 date "2011-09-01" @default.
- W156968097 modified "2023-09-26" @default.
- W156968097 title "SOLAR SYSTEM INITIAL 176 Hf/ 177 Hf INFERRED FROM THE EUCRITE NORTHWEST AFRICA 5073" @default.
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