The initial 176Hf/177Hf value (Hfi) in zircon is calculated using the measured 176Lu/177Hf, 176Hf/177Hf and apparent 207Pb/206Pb age and the 176Lu decay constant of Scherer et al. (2001) of 1.865 x 10-11. Model age calculations (TDM) are based on a depleted-mantle source with Hfi = 0.279718 and 176Lu/177Hf = 0.0384.

2006-10-30

Their εHf ratios between the Th/Hf and 176Hf/177Hf ratios in chondrites that reflects remobilization of Lu and Th during parent-body processes. Using this relationship, we Jun 1, 2010 Accurate 176Lu/177Hf ratios are important for calculation of the correct initial 176Hf/177Hf given the antiquity of the Jack Hills zircons. The 176Lu/ The 176Hf/177Hf ratio (0.282352 ± 22, n=14) of gem quality zircon used as in- house standard have been also characterized. As a geological application, we 176Hf/177Hf ratio during in-situ laser ablation MC-ICPMS analysis.

176Hf/177Hf ratio is a combination of two deter- minations. Two loading methods were primarily used, one following the method of Corfu and Nobel [25], which uses a single Re filament with an Ir-C slurry, and the other following the method of Patchett and Tatsumoto [22 Solution multi-collector ICP-MS (MC-ICP-MS) measurements of Hf isotopes from chemically purified aliquots of GHR1 yield a mean 176Hf/177Hf of 0.283050 ± 17 (2s, n = 10), corresponding to a εHf0 of +9.3. Hafnium isotopic measurements from two LA-ICP-MS laboratories are in agreement with the solution MC-ICP-MS value. Home » ANU Research » ANU Scholarly Output » ANU Research Publications » Meteorite zircon constraints on the bulk Lu-Hf isotope composition and early differentiation of the Earth ANU Research » ANU Scholarly Output » ANU Research Publications » Meteorite zircon constraints on the bulk Lu-Hf isotope composition and early differentiation of the 1995-01-01 · If the high 176Hf/ 177Hf ratios evolve over a time scale simi lar to the age of the oceanic crust beneath Hawaii (- 100 Ma), then the protoliths probably origi nate in the lithosphere. If the high Hf isotope ratios evolve over hundreds of millions, or bil lions, of years, then the protoliths must derive from a deeper, less transient, part of the mantle. 2002-05-01 · This article is cited by 42 publications. Christian Pin and Abdelmouhcine Gannoun .

176Lu/177Hf value of DM (Griffin et al., 2000) recalculated to the decay constant of Soderlund et al. (2004) and the CHUR values of Bouvier et al. (2008).

Hf from critical mid-ocean ridgebasalts shows that 176Hf/177Hf does indeed have a greater variability than 143Nd/144Nd and 87Sr/86Sr in the depleted mantle. Normalized to 176Hf/177Hf = 0.7325, 176Hf/177Hf ranges 0.2828-0.2835, based on 24 basalt samples.

A west-to-east geologic transect across the Peninsular Ranges batholith, San Diego County, California: Zircon 176 Hf/ 177 Hf evidence for the mixing of crustal- and mantle-derived magmas, and comparisons with the Sierra Nevada batholith

Shown with uncertainty expressed at 1-sigma. 6.

A total of 59 Hf isotopic measurements (176Hf/177Hf = 0.282505 ± 0.000004, MSWD = 0.626; n = 331) was used as the primary RM for Hf isotopes (no correction was applied because measured calculate the hypothetical present-day 176Hf/177Hf of the zircons' parent rock based on an average crustal 176Lu/177Hf of 0.015 (Goodge and Vervoort,.
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176Lu/177Hf ± 2 s.e. Total Hf (V) Age (Ma) 176Hf/177Hf (t)1 2017-05-08 (2002) Andres et al.

Because the mantle array lies above the Bulk Silicate Earth in a 143 Nd/ 144 Nd versus 176 Hf/ 177 Hf plot, no terrestrial basalt seems to have formed from a primitive undifferentiated mantle, thereby casting doubt on the significance of high 3 He/ 4 He ratios. Resolution of 176Yb and 176Lu interferences on 176Hf to enable accurate 176Hf/177Hf isotope ratio analysis using an Agilent 8800 ICP-QQQ with MS/MS. PDF/ Found In: Application Notes ; Date : 27 Dec 2017; File Size : 1.24 MB The 176 Hf/ 177 Hf composition of inherited and magmatic zircon in the 538 Ma S-type Peninsula pluton (South Africa) has been determined at different scales.
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Naturally occurring Hafnium has 5 stable isotope - 176Hf, 177Hf, 178Hf, 179Hf, 180Hf.

A two-stage column purification method for Hf from Zr and other elements in silicate samples using the extraction chromatographic resin, UTEVA has been developed. In the first column, using an anion-exchange resin, AG 1X8, Hf, Zr and Ti were collected. 2017-03-08 · Calculates the initial 176Hf/177Hf values, the initial epsilon hafnium values, the model age using the measured 176Lu/177Hf value and the model age assuming the parental magma was produced Isotopes and Isotope Ratios The 176Hf/177Hf ratio of the in-house standard Reagent blanks for Hf and Nd determined by has been measured relative to 176Hf/177Hf / isotope dilution are all B/0.1 pg g 1 for both 0.2821609/10 (2 S.D., n /4) obtained for interna- elements. The initial 176Hf/177Hf value (Hfi) in zircon is calculated using the measured 176Lu/177Hf, 176Hf/177Hf and apparent 207Pb/206Pb age and the 176Lu decay constant of Scherer et al.

The long-favored paradigm for the development of continental crust is one of progressive growth beginning at approximately 4 billion years ago (Ga). To test this hypothesis, we measured initial 176Hf/177Hf values of 4.01- to 4.37-Ga detrital zircons from Jack Hills, Western Australia. epsilonHf (dev …

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juvenile additions to the continental margin have 176Hf/177Hf = survive metamorphic processes. Zircon has the additional. 0·2820 [Hf(t) = 12–13].