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Lecture 8. Spring 2009. 76. February 11, 2009.

176hf 177hf

see text for details. the 93 Ma zircon protolith age (Liati. submarine lavas from Northern Kerguelen Plateau, is between a depleted component (i.e., relatively low 87Sr/86Sr with high 143Nd/144Nd and 176Hf/ 177Hf), vide reasonable solutions for the 208Pb/204Pb, 143Nd/144Nd, 176Hf/177Hf, and 3He/4He isotopic paradoxes or complexities of oceanic lavas. Although these They record precise U-Pb ages and initial 176Hf/177Hf isotope ratios providing important constraints on the age and nature of the metasomatic events occurring in Our 176Hf/177Hf results of both mafic and felsic geochemical reference standards agree with those reported by other authors. However, results obtained using was used as the primary reference material for Hf isotope ratios, with a 176Hf/ 177Hf ratio of 0.282507 ± 0.00000659. Corrected 176Lu/177Hf ratios were factor to produce the final 176Hf/177Hf and 178Hf/177Hf ratios, resulting in a During the final Hf isotope analyses, the JMC 475 Hf standard (176Hf/177Hf = Isotopic compositions are measured using H-sampler and H-skimmer cones and with glass spray chamber.

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18 Jun 2012 176Hf/177Hf isotope ratios of zircons from the Chelopech magmatic rocks, together with published data on the Chelopech area and the about Hf-176 Isotope, Enriched Hf-176, Hf-176 Oxide, Hf-176 Price, Hf-176 Applications , Hf-176 Properties, Buy Hf-176 Isotope. The significant correlations of Rb/Sr vs 87Sr/86Sr, Sm/Nd vs 143Nd/144Nd and Lu/Hf vs 176Hf/177Hf give pseudochron ages of 182 ± 33 Ma, 276 ± 50 Ma and The oldest (3.84–3.82 Ga) zircon cores have tightly clustered 176Hf/177Hf ratios that are consistent with derivation of their tonalitic precursors from chondritic 91500 reference zircon and after evaluating the existing ICPMS and TIMS data we calculate a mean 176Hf/177Hf value of 0.282303 ± 0.000003 (2σ). NF · t1/2 · ST · SE (MeV), SP. 172Hf, {syn.} 1,87 år · ε, 0,350, 172Lu.

The Central Scandinavian Dolerite Group : Protracted hotspot

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 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). Usage calc_hf(dat, constants 176Hf/177Hf value of CHUR.

While the metamorphic domains contain more radiogenic Hf isotopes than the original igneous core and mantle, their Lu/Hf ratios are significantly lower than those of core and mantle. 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. 176Hf/177Hf allowed to constrain the crystallization age (t) of the protolith. Trace elements in zircon do not show systematic variations no straightforward link to processes. 176Hf/177Hf in the rims are diﬀerent than in the cores in (t) C-833-A suggesting contribution of a Hf-enriched melt/ﬂuid. In sample C-838-A, 176Hf/177Hf suggests (t) 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 The early Mesozoic was a critical era for the geodynamic evolution of the Sakarya Zone as transition from accretion to collision events in the region. However, its complex evolutionary history is still debated.
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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.

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.).
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The Central Scandinavian Dolerite Group : Protracted hotspot

Spring 2009.