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176Hf/177Hf ratios are presented for oceanic volcanic rocks representing both extremes of the range of mantle Hf-Nd-Sr isotopic variation. Hf from critical mid-ocean ridge basalts shows that 176Hf/177Hf does indeed have a greater variability than 143Nd/144Nd and 87Sr/86Sr in the depleted mantle. The 176Hf/177Hf composition of inherited and magmatic zircon in the 538 Ma S-type Peninsula pluton (South Africa) has been determined at different scales. In the smallest rock samples investigated (<0.5 dm3), as well as within individual thin sections, magmatic zircon crystals exhibit the same wide range in εHf(538) as the pluton (8ε units). Introduction: It is generally believed that the lower reproducibility to within 2ε (176Hf/177Hf=0.282284). 176 crust is mafic in composition, being formed primarily Lu/177Hf in zircons ranged between 0.0005-0.001.

176 crust is mafic in composition, being formed primarily Lu/177Hf in zircons ranged between 0.0005-0.001. 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 from an average continental crust (176Lu/177Hf = 0.015) that originally was derived from the depleted mantle (Griffin, 2004). 2017-12-19 · Introduction Hafnium 176Hf to 177Hf isotope ratio analysis can provide insight into the different geological events and processes that a mineral underwent 176Hf/177Hf ratios are presented for oceanic volcanics representing both extremes of the range of mantle HfNdSr isotopic variation. 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.

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In the smallest rock samples investigated (<0.5 dm3), as well as within individual thin 5. 176Hf/177Hf is the measured 176Hf/177Hf, corrected for fractionation and interfences. Shown with uncertainty expressed at 1-sigma.

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All of these values are within error of the accepted values (Fisher et al., 2014a and. resulting in poor ionization efficiencies for thermal ionization. Previous techniques were able to measure. 176Hf/177Hf on Hf separates down to 1 µ of Hf with a Mar 16, 2012 (61) (176Hf/177Hf = 0.282785 and 176Lu/177Hf = 0.0336).

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 … Multiple 176Hf/177Hf measurements of international reference rocks yield a precision of 5-20 ppm for solutions containing 40 ppb of Hf, and 50-180 ppm for 1 ppb solutions (=0.5 ng sample Hf 0.5 in No correlation between 176Hf/177Hf and Lu/Hf ratio is observed, suggesting no detectable inhomogeneity in the Hf isotopic ratios due to Lu decay. These results indicate FC-1 zircons that are 3 degrees magnetic or less are isotopically homogeneous with respect to Hf regardless of color or shape. Solution data from two laboratories (Amsterdam and M{\"u}nster) yield an average present day 176Hf/ 177Hf of 0.282000 ± 0.000005 (2σ weighted mean), which we recommend as a reference and nomination value for laser-ablation Hf isotope analyses.
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In sample C-838-A, 176Hf/177Hf suggests (t) All samples contain a major component defined by 176Hf/177Hf =0.2828±0.00005, which appears in most of them to represent the earliest growth stage of zircon (Stage I). The granodiorite and the gabbro have the simplest patterns, consisting mainly of Stage I. The martian meteorite Northwest Africa (NWA) 10169 is classified as a new member of the geochemically enriched poikilitic shergottites, based on mineral composition, Lu-Hf isotope systematics, and rare earth element (REE) composition. Akin to other poikilitic shergottites, it shows a similar bimodal texture to other enriched and intermediate poikilitic shergottites. Isotopes and Isotope Ratios The 176Hf/ 177Hf ratios for relatively radiogenic compositions (BCR-1, 2; BHVO-1, 2; RGM-1) were shifted systematically toward lower values by 100-150 ppm when a borosilicate primary column was used. Although systematic, the shift for felsic compositions was generally within analytical error, except for GSP-2, which has a very low Hf isotopic ratio, where the shift was to higher 176Hf/177. 176Hf/177Hf ratio is a combination of two deter- minations.

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Naturally occurring Hafnium has 5 stable isotope - 176Hf, 177Hf, 178Hf, 179Hf, 180Hf. The 176Hf/177Hf 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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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 . Integrated Extraction Chromatographic Separation of the Lithophile Elements Involved in Long-Lived Radiogenic Isotope Systems (Rb–Sr, U–Th–Pb, Sm–Nd, La–Ce, and Lu–Hf) Useful in Geochemical and Environmental Sciences. Normalized to 176Hf/177Hf = 0.7325, 176Hf/177Hf ranges 0.2828-0.2835, based on 24 basalt samples. 176Hf/177Hf is positively correlated with 143Nd/144Nd, and negatively correlated with 87Sr/86Sr and 206Pb/204Pb.

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Model age calculations (TDM) are based on a depleted-mantle source with Hfi = 0.279718 and 176Lu/177Hf = 0.0384. 176Hf/177Hf ± 2 s.e. 178Hf/177Hf ± 2 s.e. 176Yb/177Hf ± 2 s.e. 176Lu/177Hf ± 2 s.e.

176Hf/177Hf isotope ratios can now be obtained from. Purification of Hf in silicate materials using extraction chromatographic resin, and its application to precise determination of 176Hf/177Hf by MC-ICP-MS with correct 176Hf/177Hf for mixed Yb–Hf standard solution using solution MC-ICPMS without obtaining mass bias factor β(Yb) (Griffin et al., 2006); (2) using β(Yb) Lutetium–hafnium dating is a geochronological dating method utilizing the radioactive decay Multiple set of data would be measured and plotted with 176 Hf/177Hf on y-axis and 176Lu/177Hf on x-axis. A linear relationship would be obtai 11 Feb 2009 655 Isotope Geochemistry. Lecture 8. Spring 2009. 76. February 11, 2009.