Results 121 to 130 of about 16,559 (147)
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Geochimica et Cosmochimica Acta, 2005
Abstract The mineral apatite is characterized by elevated and highly variable Lu/Hf ratios that, in some cases, allow for single-crystal dating by the Lu-Hf isotopic system. Apatites from the Adirondack Lowlands and Otter Lake area in the Grenville Province, and from the Black Hills, South Dakota, yield Lu-Hf ages that are consistently older than ...
Hoffmann Barfod*, Gry +3 more
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Abstract The mineral apatite is characterized by elevated and highly variable Lu/Hf ratios that, in some cases, allow for single-crystal dating by the Lu-Hf isotopic system. Apatites from the Adirondack Lowlands and Otter Lake area in the Grenville Province, and from the Black Hills, South Dakota, yield Lu-Hf ages that are consistently older than ...
Hoffmann Barfod*, Gry +3 more
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Lu–Hf total-rock isochron for the eucrite meteorites
Nature, 1980The isotope Lu-176 (2.6% of natural lutetium) decays by beta(-) to Hf-176, with a long half life. The first Lu-Hf isochron is presented. The eucrite meteorites, a suite of planetary igneous rocks of known age, 4,550 Myr, define a 10-point total-rock isochron with a slope of 0.0934 + or - 40, leading to a value of 3.53 + or - 0.14 x 10 to the 10th yr ...
P. J. Patchett, M. Tatsumoto
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Dating crustal anatexis in UHT granulites with Lu-Hf
2020<p>Ultra-high temperature (UHT) metamorphism is a thermal regime that can be attained by the lower continental crust in exceptional contexts and that is usually accompanied by fluid-absent dehydration melting. Such conditions are observed in the Gruf Complex, a 12 x 10 km migmatitic body located in the Central Alps, which is ...
Omar Gianola +4 more
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Lu–Hf zircon evidence for rapid lunar differentiation
Earth and Planetary Science Letters, 2009Abstract Zircons from the Apollo 14 polymict breccias 14304, 14305, and 14321 crystallized from highly incompatible-trace-element enriched sources over an extended period of early lunar history from 4.4 to 4.0 Ga. These zircons contain the least radiogenic 176Hf/177Hf yet observed in lunar samples, consistent with their source magmas containing a ...
Dianne J. Taylor +2 more
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On the Lu‐Hf Isotope Geochemistry of Silicate Rocks
Geostandards Newsletter, 2001This paper reviews the history (TIMS, hot‐SIMS, MC‐ICP‐MS), significance, geochemical behaviour and current uncertainties (λ176 Lu, Hf‐Nd Bulk Silicate Earth) surrounding the Lu‐Hf isotope system, and thus marks two decades of its application to geochemical problems.
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Isotopic evidence for chondritic Lu/Hf and Sm/Nd of the Moon
Earth and Planetary Science Letters, 2013Abstract Refractory lithophile elements are generally considered to occur in chondritic relative abundances in terrestrial planets. This assumption forms the basis for using isotope systems such as 176Lu–176Hf and 146, 147Sm–142, 143Nd as tracers of planetary evolution.
Sprung Peter +2 more
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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 ...
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Lu‐Hf and Sm‐Nd evolution in lunar mare basalts
Journal of Geophysical Research: Solid Earth, 1984Lu‐Hf and Sm‐Nd data for mare basalts combined with Rb‐Sr and total REE data taken from the literature suggest that the mare basalts were derived by small (≤10%) degrees of partial melting of cumulate sources, but that the magma ocean from which these sources formed was light REE and Hf‐enriched.
D. M. Unruh +3 more
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The Hf-INATOR: A free data reduction spreadsheet for Lu/Hf isotope analysis
Earth Science Informatics, 2017During the last decade, the in situ Lu-Hf isotope methodology has been widely used in Earth sciences and the number of laboratories performing Lu-Hf analysis has increased together with dedicated scientific software. However, free and user-friendly software for the Lu-Hf data reduction is currently missing. We present the ‘Hf-INATOR’, a new interactive
Giovanardi, T., Lugli, F.
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In-situ Lu-Hf geochronology of carbonates
Goldschmidt2022 abstracts, 2022Alexander Simpson +5 more
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