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Jingao Liu, D. Alard, O. Project : Research.

Two metamorphic gold mineralization events confirmed by Lu-Hf isotope dating of garnet in the Late Archean Storø Au deposit, Nuuk region of SW Greenland.

Downes, Hilary and de Vries, C. International Journal of Earth Sciences 1 , pp. ISSN Clinopyroxenes in some fresh anhydrous spinel peridotite mantle xenoliths from the northern Massif Central France and Lower Silesia Poland , analysed for a range of incompatible trace elements by laser ablation inductively coupled plasma mass spectrometry, show unusually strong negative anomalies in Hf and Zr relative to adjacent elements Sm and Nd, on primitive mantle-normalised diagrams.

Similar Zr—Hf anomalies have only rarely been reported from clinopyroxene in spinel peridotite mantle xenoliths worldwide, and most are not as strong as the examples reported here. Nevertheless, some mantle xenoliths from Poland or the Czech Republic may be amenable to Hf-isotope dating in the future. Additional statistics are available via IRStats2.

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Peter D. Reviews in Mineralogy and Geochemistry ; 53 1 : — As a significant carrier of uranium, thorium and the rare earth elements REEs at ppm level, and hafnium at the percent level, zircon hosts a remarkable number of long-lived radioactive isotopes and their stable decay products. These include U, U and Th which decay via intermediate steps to Pb, Pb and Pb, respectively, Lu which decays to Hf, Sm which decays to Nd, and La which undergoes branched decay to Ce and Ba.

Petrogenesis and Lu–Hf dating of (ultra)mafic rocks from the Kutná. Hora Crystalline Complex: implications for the Devonian evolution of the Bohemian Massif.

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Lu-Hf Dating: The Lu-Hf Isotope System

Anczkiewicz, R. Lu-Hf geochronology and trace element distribution in garnet: Implications for uplift and exhumation of ultra-high pressure granulites in the Sudetes, SW Poland. Lithos , 95 pp. The surrounding rocks were metamorphosed at the same time as indicated by The second metamorphic episode, which affected most of the lower crust in the Orlica-Snieznik Massif OSM occurred at ca.

Lu–Hf and Sm–Nd dating of metamorphic garnet: evidence for multiple accretion events during the Caledonian orogeny in Scotland. Research output.

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide. Bast uni-muenster. When such samples are spiked, correcting for the isobaric interference of Lu on Hf is not always possible if the separation of Lu and Hf is insufficient. In addition, Sm—Nd and Rb—Sr separations can easily be added to the described two-stage ion-exchange procedure for Lu—Hf.

The routine analysis of sub-ng amounts of Hf will facilitate Lu—Hf dating of low-concentration samples. This article is licensed under a Creative Commons Attribution 3. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material.

The Lu–Hf dating of garnets and the ages of the Alpine high-pressure metamorphism

Mauricio Ibanez-Mejia, George E. Gehrels , Joaquin Ruiz , Jeffrey D. Vervoort, Michael E. Eddy, Chen Li.

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Geochronology

The Lu-Hf isotope system, with applications to geo- and cosmochemistry, was first investigated in the early s Patchett b ; Patchett and Tatsumoto a, b , c , following the successful implementation of the Rb-Sr and Sm-Nd isotope systems several years earlier. There are some obvious similarities between the Lu-Hf and Sm-Nd isotope systems and, as a result, they have long been used in concert in a wide range of studies e.

In these two systems all elements are lithophile and refractory with high condensation temperatures. Because of these characteristics it has long been assumed that their abundances in the Earth can be approximated by chondritic meteorites see discussion below. In addition, all elements in these systems behave incompatibly during melting and are concentrated in the melt over the residual solid.

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Brouwer , M. Groen, O. Nebel, J. Wijbrans , H. Qiu, Q. Yang, L. Zhao, Y.

Rare-Earth Clocks, Sm-Nd and Lu-Hf Dating Models 2: Radioactive Dating, Part 6

Official websites use. Share sensitive information only on official, secure websites. Importance of the Lu-Hf isotopic system in studies of planetary chronology and chemical evolution Geochimica et Cosmochimica Acta.

The crystallization age of zircon can be precisely determined by U−Pb dating. Furthermore, zircon is extremely resistant to secondary Lu−Hf.

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U-PB AND LU-HF GEOCHRONOLOGIC CONSTRAINTS ON THE PROTEROZOIC EVOLUTION OF THE RUBY RANGE, MONTANA

Portsmouth Research Portal. Bird M. Thirlwall Professor Rob Strachan C. Caledonian orogenesis in Scotland is currently interpreted in terms of a Mid-Ordovician arc—continent collision Grampian event followed by the Silurian collision of Laurentia with Baltica Scandian event. Lu—Hf and Sm—Nd garnet ages of c.

PDF | DefinitionThe radiogenic isotope applications of the Lu-Hf system utilize variations in Hf resulting from the radioactive decay of Lu.

Either your web browser doesn’t support Javascript or it is currently turned off. In the latter case, please turn on Javascript support in your web browser and reload this page. Free to read. Author contributions: T. Yet the data interpretation requires a well-defined hafnium isotope growth curve of the bulk Earth, which is notoriously difficult to reconstruct from the variable bulk compositions of undifferentiated chondrite meteorites.

Here we use lutetium—hafnium systematics of meteorite zircon crystals to define the initial hafnium isotope composition of the Solar System and further to identify pristine chondrites that are the best representative of the lutetium—hafnium system of the bulk Earth. Knowledge of planetary differentiation is crucial for understanding the chemical and thermal evolution of terrestrial planets. However, these ratios in chondrites are highly variable due to the metamorphic redistribution of Lu and Hf, making it difficult to ascertain the correct reference values for the bulk Earth.

In addition, it has been proposed that chondrites contain excess Hf due to the accelerated decay of Lu resulting from photoexcitation to a short-lived isomer. Our results provide firm evidence that the most primitive Hf in terrestrial zircon reflects the development of a chemically enriched silicate reservoir on Earth as far back as 4.

Dating a single garnet crystal with very high Sm/Nd ratios (Campo basement unit, Eastern Alps)

Providing customized analytical solutions at the highest standards of quality assurance and quality control. Samples for U-Pb dating are processed using a Rhino jaw crusher, a Bico disk grinder equipped with ceramic grinding plates, and a Wilfley wet shaker table equipped with a machined Plexiglass top, followed by conventional heavy liquid and magnetic separation using a Frantz magnetic separator. Four binocular microscope workstations are available for sample picking.

The external morphology of mineral grains for analysis can be documented by SEM, and internal structure can be examined in polished grain mounts by cathodoluminescence imaging. TIMS U-Pb geochronology is widely recognized as one of the most robust and precise dating techniques.

Garnet is the main target of REE-based Sm-Nd and Lu– Hf dating, as its lattice preferentially incorporates heavy REE (HREE) and, therefore, shows elevated.

Because of the low concentrations of Lu and Hf and the very long half-life of Lu 35, million years , the accurate use of the Lu-Hf method has been limited until recent technological advances Dalrymple, , p. The Lu-Hf method is now being effectively used to date certain rocks, especially meteorites Dalrymple, , p. As with any radiometric method, the ancient dates from the Lu-Hf method utterly refute the claims of young-Earth creationism. Therefore, it’s not surprising that Lu-Hf dating is yet another target for the wrath of young-Earth creationists.

Nevertheless, the only response that Woodmorappe , p. The Lu-Hf system is demonstrably sensitive to the mineralogy of magma sources in the mantle and crust. However, does this statement by Scherer et al. The answer is no. As with many of Woodmorappe’s quotations, when they are taken in context, they actually fail to support his antiquated claims. Specifically, the statements of Scherer et al. The Lu-Hf system is demonstrably sensitive to the mineralogy of magma sources in the mantle and crust As a result, the Lu-Hf system provides a view of crust-mantle evolution that is unique as compared to more commonly used isotopic systems such as Rb-Sr, Sm-Nd, and U-Pb.

Rather than undermining the reliability of the Lu-Hf method, the sensitivity of the method in identifying and dating magma sources is actually an asset!

Lecture 18 Lu Hf