Results 141 to 150 of about 1,457 (180)
Some of the next articles are maybe not open access.
Lu–Hf, Sm–Nd, and U–Pb isotopic coupling and decoupling in apatite
Geochimica et Cosmochimica Acta, 2022Available online 12 October 2022 ; Apatite is a useful geochronological tool due to its common occurrence and incorporation of a variety of radioactive parent isotopes during crystallisation. However, an understanding of the geological conditions recorded by each of these isotopic systems in apatite is necessary for their effective application to ...
Gillespie, J. +5 more
openaire +2 more sources
Lu-Hf and Sm-Nd isotope systems in zircon
Reviews in Mineralogy and Geochemistry, 2003As 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 238U, 235U and 232Th which decay via intermediate steps to 206Pb, 207Pb and 208Pb, respectively, 176Lu which ...
openaire +1 more source
A routine high-precision method for Lu-Hf isotope geochemistry and chronology
Contributions to Mineralogy and Petrology, 1981A method for chemical separation of Lu and Hf from rock, meteorite and mineral samples is described, together with a much improved mass spectrometric running technique for Hf. This allows (i) geo- and cosmochronology using the176Lu→176Hf+β − decay scheme, and (ii) geochemical studies of planetary processes in the earth and moon. Chemical yields for the
Tatsumoto, M., Patchett, P. J.
openaire +1 more source
Strengths and limitations of zircon Lu-Hf and O isotopes in modelling crustal growth
Lithos, 2016Abstract The robust nature of the mineral zircon, combined with our analytical ability to readily acquire in-situ uranium-lead (U-Pb), lutetium-hafnium (Lu-Hf) and oxygen (O) isotopic data, has resulted in a rapid rise in the use of zircon isotopic datasets for studying both the generation of continental crust and its growth through Earth history. In
Payne, J. +5 more
openaire +2 more sources
The Lu–Hf isotope geochemistry of shergottites and the evolution of the Martian mantle–crust system
Earth and Planetary Science Letters, 1999We report the first Lu‐Hf isotopic data from SNC (Martian) meteorites with high-precision analyses of five shergottites by plasma sector mass spectrometry. Hf isotopic compositions indicate the presence of both geochemically enriched and depleted components, reflecting early segregation of Martian crust and mantle.
Janne Blichert-Toft +3 more
openaire +1 more source
Lu-Hf isotope study of the marginal terranes of the northern Gawler Craton
2016Presentation as part of the GOMA (Gawler-Officer-Musgrave-Amadeus seismic and MT workshop, Adelaide 2010. This presentation uses integrated U-Pb-Hf study on zircons from scientific drilling into buried margins of the Gawler Craton to inform on Palaeoproterozoic crustal architecture.
Armit, Robin +2 more
openaire +1 more source
Analytica Chimica Acta, 2005
Abstract A new method is described for the concomitant use of the Lu–Hf and Sm–Nd radiogenic isotope systems on the same rock digest. After total spiking with two mixed 176 Lu– 179 Hf and 149 Sm– 150 Nd enriched tracers, the sample is decomposed by fusion with a LiBO 2 flux in an induction furnace.
Brieuc Le Fèvre, Christian Pin
openaire +1 more source
Abstract A new method is described for the concomitant use of the Lu–Hf and Sm–Nd radiogenic isotope systems on the same rock digest. After total spiking with two mixed 176 Lu– 179 Hf and 149 Sm– 150 Nd enriched tracers, the sample is decomposed by fusion with a LiBO 2 flux in an induction furnace.
Brieuc Le Fèvre, Christian Pin
openaire +1 more source
Lu-Hf Isotopic Compositions of SNC Meteorites: Implications for Martian Mantle Evolution
Mineralogical Magazine, 1998In contrast to the Earth, garnet is not stable in the lunar mantle and should not appear in the Martian mantle at shallow depth either. Clinopyroxene, however, is expected to be present in different proportions in the mantles of all three planets. The potential of Hf isotope geochemistry lies with a large parent-daughter Lu-Hf fractionation for garnet ...
openaire +1 more source
Relationships between Lu–Hf and Sm–Nd isotopic systems in the global sedimentary system
Earth and Planetary Science Letters, 1999Abstract We report new Hf (and Nd) data for more than 100 sedimentary samples, recent to Archean in age, from a wide range of depositional environments. These data document the behavior of Lu–Hf and Sm–Nd isotopic systems in the global sedimentary system.
Jeff D Vervoort +3 more
openaire +1 more source
Importance of the Lu-Hf isotopic system in studies of planetary chronology and chemical evolution
Geochimica et Cosmochimica Acta, 1983The Lu-176-Hf-176 isotope method and its applications in earth sciences are discussed with regard to planetary-evolution studies. From new data on basalts from oceanic islands, Hf-176/Hf-177 and Nd-143/Nd-144 are found to display a single linear isotopic variation in the suboceanic mantle, whereas considerable divergences occur in Hf-176/Hf-177-Sr-87 ...
openaire +1 more source