Two of the granodiorite samples have suprachondritic 176Hf/177Hf ratios (avg. 0.28106 and 0.28107 at 2663 and 2651 Ma respectively) and nearly chondritic εHf values (avg. -0.5 and -0.3 respectively).
Hafnium has five stable isotopes ( 176Hf, 177Hf, 178Hf, 179Hf, and 180Hf). List the total number of neutrons in each isotope. What is the average molar mass given these isotopes.
εHf. Taklimakan Desert. TK-10. 82.79. 37.23.
Shown with uncertainty expressed at 1-sigma. 6. 176Lu/177Hf is the intensity of 176Lu, calculated from the measured instensity of 175Lu and 176Lu/175Lu=0.02653 (from Patchett, 1983), compared to the measured intensity of 177Hf. Fractionation of Lu New 176Hf/177Hf measurements for 201 Ma Eastern North American tholeiites dominantly record a local petrogenetic history. Their εHf ratios, corrected to an emplacement age of 201 Ma (-7.85 to +5.86), form a positive but shallowly sloped array slightly deviating from the terrestrial array on a εHf vs. εNd diagram. Hf isotopic analyses of all 6 fractions yielded very consistent results with the average 176Hf/177Hf=0.282174 ± 12 (2 S.D.), relative to JMC-475 176Hf/177Hf=0.282162 ± 5 (2 S.D.).
A west-to-east geologic transect across the Peninsular Ranges batholith, San Diego County, California: Zircon 176Hf/177Hf evidence for the mixing of crustal- and
176Hf/177Hf is the measured 176Hf/177Hf, corrected for fractionation and interfences. Shown with uncertainty expressed at 1-sigma.
5. 176Hf/177Hf is the measured 176Hf/177Hf, corrected for fractionation and interfences. Shown with uncertainty expressed at 1-sigma. 6. 176Lu/177Hf is the intensity of 176Lu, calculated from the measured instensity of 175Lu and 176Lu/175Lu=0.02653 (from Patchett, 1983), compared to the measured intensity of 177Hf. Fractionation of Lu
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. It is shown For zircons, the obtained 176Hf/177Hf ratios are 0.282307±31 (2SD) for 91500 submarine lavas from Northern Kerguelen Plateau, is between a depleted component (i.e., relatively low 87Sr/86Sr with high 143Nd/144Nd and 176Hf/ 177Hf), mate' yielded a 176Lu/177Hf of 0.03976 and a 176Hf/177Hf of 0.283238. ( Vervoort et al., 2018).
Their εHf ratios, corrected to an emplacement age of 201 Ma (-7.85 to +5.86), form a positive but shallowly sloped array slightly deviating from the terrestrial array on a εHf vs. εNd diagram. 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
2006-10-30
2017-12-27
Normalized to 176Hf/177Hf = 0.7325, 176Hf/177Hf ranges from 0.2828 to 0.2835, based on 24 basalt samples.
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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.
Early studies of Hf isotopes in subduction zones reached different conclusions regarding the mobility of high-field-strength elements during subduction-related processes.
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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).
TLD-800. 83.27. The lower concentration of 176Hf/177Hf is determined for magma from crustal reworking [19,45]. 3 Analytical techniques.
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Hafnium 176Hf to 177Hf isotope ratio analysis can provide insight into the different geological events and processes that a mineral underwent during its formation/metamorphosis; 176Hf/177Hf ratios
Using high-precision multiple collector inductively coupled plasma-mass spectrometry (MC-ICP-MS), 176Hf/177Hf was measured in 64 mid-ocean ridge basalts (MORB) from the Mid-Atlantic Ridge … 1 calculated using the 176Lu decay constant of Soderlund et al.