Hafnium Isotope Geochronology

  • Lutetium–hafnium dating - Wikipedia

    Lutetium–hafnium dating is a geochronological dating method utilizing the radioactive decay system of lutetium–176 to hafnium–176. With a commonly accepted half-life of 37.1 billion years, the long-living Lu–Hf decay pair survives through geological time scales, thus is useful in geological studies. Due to chemical properties of the two elements, namely their valences and ionic radii ...

  • U-PB ZIRCON AND MONAZITE GEOCHRONOLOGY AND …

    the Alabama EBR by conducting U-Pb zircon geochronology, whole rock geochemistry and zircon Lu-Hf isotope and trace element geochemistry of six intrusions that were emplaced over a period of more than 40 m.y.r. during and following Neoacadian deformation in the Alabama EBR.

  • What do epsilon hafnium isotopic arrays tell us about ...

    ican, Saharan and West African hafnium isotopic fi ngerprints in Avalonia, Iberia and the Armorican terranes Abstract 26 Introduction 26 Geological background 27 Sample selection 33 Analytical methods 35 Results: U-Pb zircon geochronology 38 Results: Hafnium isotopes 42 Defi ning hafnium isotope …

  • Detrital zircon uranium-lead geochronology and hafnium ...

    Detrital zircon uranium-lead geochronology and hafnium-isotope analyses of passive margin and Roberts Mountains allochthon strata: Interpreting the Early Paleozoic tectonic evolution of …

  • Hafnium-isotopes: a new tool for Geoscience Australia ...

    Nov 30, 2016· Hafnium-isotopes: a new tool for Geoscience Australia. 30 November 2016. Lutetium-Hafnium and Oxygen-isotope analyses on zircons are techniques that Geoscience Australia has recently started using to trace the source of rocks back through time. Together with U-Pb analyses, these tools can be used to determine not only how old a rock is, but ...

  • Atomic Weight of Hafnium | Commission on Isotopic ...

    The minor isotope, 174 Hf, is an α-emitter ... , however, does not preclude their use in geochronology. SOURCE Atomic weights of the elements: Review 2000 by John ... of the elements. Bohr argued that hafnium would not be a rare earth element, but would be found in zirconium ore. Hafnium was discovered by the Dutch physicist Dirk Coster and ...

  • ANU - Research School of Earth Sciences - ANU College of ...

    PhD research – Hafnium isotopes and U-Pb geochronology of metamorphic rutile The use of isotopic and geochronological techniques to help unravel the geological history of metamorphic terranes, and to constrain the timing of burial and exhumation, is now well established.

  • PAC-REC-15-07-03 v38 Part 2

    4.72.1 Hafnium isotopes in geochronology Some 176 Hf is radiogenic as a result of it being formed as a product of beta decay of radioactive 176 Lu (half-life = 3.73 × 10 10 years) [298]. Thus, relations between the isotope-amount ratios n(176 Hf)/n(177 Hf) and n(176 Hf)/n(176 Lu) have been used to determine the ages of minerals and

  • Calibration of the Lutetium-Hafnium Clock | Science

    Jul 27, 2001· Lutetium-hafnium ages that are based on the previously used λ176Lu of 1.93 × 10−11 to 1.94 × 10−11year−1 are thus ∼4% too young, and the initial hafnium isotope compositions of some of Earth's oldest minerals and rocks become less radiogenic relative to bulk undifferentiated Earth when calculated using the new decay constant.

  • Detrital zircon U-Pb geochronology and Hf isotope ...

    Abstract. Detrital zircon U-Pb geochronology and Hf isotope geochemistry provide new insights into the provenance, sedimentary transport, and tectonic evolution of the Roberts Mountains allochthon strata of north-central Nevada.

  • Detrital zircon uranium-lead geochronology and hafnium ...

    Detrital zircon U-Pb geochronology and Hf-isotope analyses indicate the provenance, sedimentary distribution patterns, and tectonic evolution of Upper Neoproterozoic–Cambrian passive margin strata and Ordovician –Devonian strata of the RMA, with a special emphasis on the enigmatic Harmony Formation.

  • Geochronology: Recent Development Lutetium …

    isotope dilution value. The precision Hf measurement is nobetter than 10 percent (2a) for sev-eral reasons, including the instability of theion current, isobaric interfer-ence of the rare earths, the poor en-richment of the Hf spike, and the low content of radiogenic 176Hf in the gadolinite. For the common hafnium correction, the measured ...

  • Hafnium isotope variations in oceanic basalts - Patchett ...

    Brian L. Beard and Clark M. Johnson, Hafnium isotope evidence for the origin of Cenozoic basaltic lavas from the southwestern United States, Journal of Geophysical …

  • Early Cretaceous ridge subduction beneath southern Alaska ...

    Early Cretaceous ridge subduction beneath southern Alaska: Insights from zircon U-Pb geochronology, hafnium, and oxygen isotopic compositions of the Western Chugach tonalite-trondhjemite suite

  • Abstract: U-PB ZIRCON AND MONAZITE GEOCHRONOLOGY AND ...

    Dec 01, 2010· u-pb zircon and monazite geochronology and hafnium isotopic geochemistry of neoacadian and early alleghenian plutonic rocks in the alabama …

  • Age and composition of basement beneath the De Long ...

    archipelago, Arctic Russia, based on zircon U–Pb geochronology ... and hafnium isotope geochemistry of zircons from granitic and siliciclastic crustal xenoliths from Cenozoic alkali basalts on Zhokhov Island (De Long Archipelago, Russian Arctic), provide new insights about the island’s subsurface

  • Isotope Supplier: Stable Isotopes and Radioisotopes from ...

    Hafnium was discovered in 1923 by Dirk Coster and George Charles von Hevesy. Its name derives from the Latin name Hafnia, meaning “Copenhagen.” Hafnium is generally similar to zirconium. It has gray crystals, good corrosion resistance and high strength. It occurs as a close-packed hexagonal alpha form and as a body-centered cubic beta ...

  • OXYGEN AND HAFNIUM ISOTOPE GEOCHEMISTRY OF …

    In this study, I present new oxygen and hafnium isotope analyses and U-Pb geochronology on the Crawfish Inlet Pluton (CIP) and the Krestof Pluton (KP) from the eastern part of the Sanak-Baranof Belt on Baranof Island to further evaluate the hypothesis of …

  • ln . 20693 t - Geology

    1 Radiogenic isotope geochemistry and geochronology Vojtěch Janoušek: What is an isotope? Nuclide Z = atomic number = number of protons A = mass number = number of nucleons (protons + neutrons) N = neutron number = number of neutrons, i.e. N = A–Z The same Z – isotopes The same A – isobars A Z X Relative atomic mass • Dalton (or atomic mass unit - a.m.u.) ...

  • Hafnium isotope characterization of the GJ-1 zircon ...

    Sep 30, 2008· Hafnium isotope ratios and 176 Lu/ 177 Hf were calculated offline for each cycle in the same manner as the solution analyses. Depending on daily tuning conditions, we obtained ∼ 2 V of 177 Hf for the GJ-1 zircon reference material with decreasing intensities to ∼ 0.5 V during analyses with progressive ablation depth.

  • U–Pb geochronology and Hf–Nd isotope compositions of the ...

    S.E. Jackson, In situ hafnium and lead isotope analyses [48] J.S. Stacey, J.D. Kramers, Approximation of terrestrial of detrital zirconsfrom the Devonian sedimentary basin of lead isotope evolution by a two-stage model, Earth Plan- NW Greenland a record of repeated …

  • Hafnium isotope variations in oceanic basalts - Patchett ...

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  • Origins and evolution of rhyolitic magmas in the central ...

    Jan 13, 2018· Origins and evolution of rhyolitic magmas in the central Snake River Plain: insights from coupled high-precision geochronology, oxygen isotope, and hafnium isotope analyses of zircon

  • Hafnium isotopes in zircon: A tracer of fluid-rock ...

    Request PDF on ResearchGate | Hafnium isotopes in zircon: A tracer of fluid-rock interaction during magnetite–apatite (“Kiruna-type”) mineralization | In situ analyses of hafnium isotopes in ...

  • Resolution of 176Yb and 176Lu interferences on 176Hf to ...

    Introduction 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 are also used for geochronology dating studies.

  • Detail - Everything - JCU Research Data

    Hafnium isotope data related to "Melanesian arc far-field response to collision of the Ontong Java Plateau: geochronology and petrogenesis of the Simuku Igneous Complex, New …

  • Hafnium Isotopes | SpringerLink

    Jun 27, 2016· Hafnium consists of the five stable isotopes 176 Hf, 177 Hf, 178 Hf, 179 Hf, and 180 Hf. Of these, ~1 % of 176 Hf is radiogenic (the rest being “common” Hf created during nucleosynthesis), produced by the beta decay of radioactive 176 Lu with a half-life of ~37 Ga. In addition, radioactive 182 Hf, with a half-life of 8.9 Ma, was present in the early Solar System, leading to variable ...

  • What can Hadean detrital zircon really tell us? A critical ...

    What can Hadean detrital zircon really tell us? A critical evaluation of their geochronology with implications for the interpretation of oxygen and hafnium isotopes. Author links open overlay panel M.J. Whitehouse a A.A. Nemchin b R.T. Pidgeon b. Show more.

  • Zircon M127 AHomogeneousReferenceMaterialforSIMS Pb ...

    SIMS in combination with hafnium and stable isotope (oxygen and potentially also lithium) determination. Keywords: zircon, reference material, SIMS, U–Pb geochronology, oxygen isotopes, hafnium isotopes, lithium isotopes. l’age (U-Th)/He de 426^ ± 7 Ma (2s), ce qui est typique d’un zircon du Sri Lanka non chauff!e, nous permettent

  • Zircon Hafnium–Oxygen Isotope and Trace Element ...

    Axel K Schmitt, Malte Klitzke, Axel Gerdes, Christof Schäfer, Zircon Hafnium–Oxygen Isotope and Trace Element Petrochronology of Intraplate Volcanic Rocks from the Eifel (Germany) and Implications for Mantle versus Crustal Origins of Zircon Megacrysts, Journal of Petrology, Volume 58, Issue 9, September 2017, Pages 1841–1870, https://doi ...

  • Rapid heterogeneous assembly of multiple magma reservoirs ...

    Sep 10, 2015· Here we present a comprehensive data set including in situ oxygen isotope and trace element analyses, hafnium isotope analyses and high-precision U-Pb geochronology…

  • Geochronology and Isotopic Mapping | Exploring for the Future

    Geochronology and Isotopic Mapping. The goal of the Geochronology and Isotopic Mapping component of the Exploring for the Future program is to provide key isotopic datasets in map form for visualisation with other geological datasets.

  • Stable Relative Mole - KCVS

    Hafnium isotopes in geochronology . Some 176Hf is . radiogenic. as a result of it being formed as a product of . beta decay. of radioactive . 176. Lu (half-life = 3.73×10

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