Hf-W Dating

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Hafnium-tungsten dating - Wikipedia
Effects of core formation on the Hf-W isotopic composition . . .
PDF U-Pb & Hf-W DATING OF YOUNG ZIRCON IN MESOSIDERITE ASUKA . . .
Effects of core formation on the Hf-W isotopic composition . . .
U-Pb and Hf-W dating of young zircon in mesosiderite Asuka . . .
Hf-W and U-Pb Dating and REE and Ti Anaylysis of Zircons . . .
Effects of core formation on the Hf-W isotopic composition . . .
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Basic principle . The radioactive system behind hafnium-tungsten dating is a two-stage decay as follows: 182 72 Hf → 182 73 Ta e − ν e 182 73 Ta → 182 74 W e − ν e . The first decay has a half-life of 8 .9 million years, while the second has a half-life of only 114 days, such that the intermediate nuclide tantalum-182 (182 Ta) can effectively be ignored . Since hafnium-182 is an extinct . . .
Effects of core formation on the Hf-W isotopic composition of the Earth and dating of the Moon-forming impact Earth Planet Sci Lett . 2018 Oct 1;499:257-265 . doi: 10 .1016/j .epsl .2018 .07 .030 . Epub 2018 Aug 7 . Authors Rebecca A Fischer 1 . . .
For Hf-W dating , the absolute Hf-W age of A88 zircon becomes 4532 .8 +5 .7/-10 .4 Ma (1-sigma; Fig . 2) with the estimated RSF, which is determined from the analyzed data of Agoult zircon and its literature age [7] . The U-Pb and Hf-W ages of A88 zircon are consistent at ca . 4530 Ma within experimental errors . This age is
Fischer R .A . and Nimmo F . 2018 . "Effects of core formation on the Hf-W isotopic composition of the Earth and dating of the Moon-forming impact ." Earth and Planetary Science Letters, 499, Pp . 257-265 .
This report describes the first in situ U-Pb and Hf-W dating of zircon in a mesosiderite Asuka 882023 . The U-Pb (4502 ± 75 Ma) and Hf-W (4532 .8 + 5 .7/-10 .5 Ma) ages may represent timing of the zircon formation, which is considerably younger than crustal differentiation of the parent body .
Hf-W and U-Pb Dating and REE and Ti Anaylysis of Zircons Extracted from Mesosiderites . In this study, we conducted U-Pb and Hf-W dating and measured REE and Ti concentration in zircons from the same mesosierites in order to discuss origin and evolution of these zircons by using NanoSIMS 50 at AORI,the University of Tokyo .
Hf-W isotopes provide unique constraints on conditions of Earth's core formation . • Average fraction of equilibrating metal was likely k = 0 .2-0 .55 . . k corresponds to average equilibration depth 0 .5-0 .7× core-mantle boundary pressure . . Tradeoffs between k, equilibrating silicate mass, equilibration depth, and timing . . Earlier Moon-forming impacts require higher degree of metal . . .
Hydrogen fluoride mixes readily with water forming hydrofluoric acid . For all practical purposes, they are considered the same chemical . Hydrogen fluoride/hydrofluoric acid is used extensively in the extraction, processing, and refining of metals, rock, brick, and oil . It is an intermediate for many chemical reactions and syntheses .
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