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pro vyhledávání: '"Extinct radionuclide"'
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Publikováno v:
Geochimica et Cosmochimica Acta. 285:70-77
The IUPAC-IUGS joint Task Group “Isotopes in Geosciences” recommends a value of (106.25 ± 0.38) Ga for the half-life of 147Sm, and a corresponding decay constant λ147 = (6.524 ± 0.024) × 10−12 a−1, both with a coverage factor k = 2. For t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e40f93da9e5c968e440da07ddc3a79af
https://doi.org/10.1016/j.gca.2020.06.022
https://doi.org/10.1016/j.gca.2020.06.022
Autor:
Piers Koefoed, Claudine H. Stirling, Josh Wimpenny, Yuri Amelin, Matthew E. Sanborn, Ilsa R. Cooke, Qing-Zhu Yin
Publikováno v:
Geochimica et Cosmochimica Acta. 244:478-501
The achondrite Asuka 881394 has mineralogy broadly similar to that of eucrites but is isotopically, chemically and texturally distinct from them. Previous U-Pb chronology shows that it is very old; forming within the first 0.8 Ma of the formation of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c57d4a29be538cd25c743f3b8306fc56
https://doi.org/10.1016/j.gca.2018.10.006
https://doi.org/10.1016/j.gca.2018.10.006
Autor:
Martin C. Towner, Gregory A. Brennecka, Philip A. Bland, Meenakshi Wadhwa, L. J. Spivak-Birndorf, Audrey Bouvier, Gretchen Benedix, Pavel Spurný, Kieren T. Howard, Samantha J. Hammond, Nick Rogers
Publikováno v:
Meteoritics & Planetary Science. 50:958-975
Bunburra Rockhole is a unique basaltic achondrite that has many mineralogical and petrographic characteristics in common with the noncumulate eucrites, but differs in its oxygen isotope composition. Here, we report a study of the mineralogy, petrolog
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7f39991045a13a12aa89d76e1d76073e
https://doi.org/10.1111/maps.12443
https://doi.org/10.1111/maps.12443
The extinct radionuclide 205Pb, which decays to 205Tl with a half-life of 15 Ma, is of considerable cosmochemical interest, as it is the only short-lived isotope that is produced exclusively by s-process nucleosynthesis. Evidence for the existence of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b8804ec638dc3ed53eb14bd122e2b234
https://doi.org/10.1016/j.epsl.2009.12.044
https://doi.org/10.1016/j.epsl.2009.12.044
Autor:
M. Telus, Michael R. Savina, Thomas Stephan, Michael J. Pellin, Gary R. Huss, Reto Trappitsch, Andrew M. Davis, O. S. Pardo, Nicolas Dauphas, Patrick Boehnke
Publikováno v:
The Astrophysical Journal. 857:L15
Establishing the abundance of the extinct radionuclide 60Fe (half-life 2.62 Ma) in the early solar system is important for understanding the astrophysical context of solar system formation. While bulk measurements of early solar system phases show a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4c1c0c88751c02675e5421336aa3c39b
https://doi.org/10.3847/2041-8213/aabba9
https://doi.org/10.3847/2041-8213/aabba9
Publikováno v:
Geochimica et Cosmochimica Acta. 73:5202-5211
We report on an investigation of the 26Al–26Mg isotope systematics in the D’Orbigny and Sahara 99555 angrites. High precision Mg isotope compositions and Al/Mg ratios were measured in mineral separates and whole rock samples from D’Orbigny and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3ae8ab89d3b0ba63ee9af755478ea5ef
https://doi.org/10.1016/j.gca.2009.02.038
https://doi.org/10.1016/j.gca.2009.02.038
Publikováno v:
Geochimica et Cosmochimica Acta. 72:5330-5341
The extinct radionuclide 107Pd decays to 107Ag (half-life of 6.5 Ma) and is an early solar system chronometer with outstanding potential to study volatile depletion in the early solar system. Here, a comprehensive Ag isotope study of carbonaceous and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::08dd58a1b3f711c02488385ca9801b76
https://doi.org/10.1016/j.gca.2008.07.032
https://doi.org/10.1016/j.gca.2008.07.032
Autor:
Mitsuru Ebihara, Satoshi Sakurai, J. Y. Chai, Yasuji Oura, M. Magara, Y. Miyamoto, Shigekazu Usuda, Y. Kokubu
Publikováno v:
Journal of Radioanalytical and Nuclear Chemistry. 272:397-401
In order to search for isotopic anomalies of U caused by the disintegration of 247Cm in meteorite samples, an analytical scheme for determining 235U/238U ratio for a small amount of uranium (less than 1 ng U) was established. The isotopic ratio of U
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fdb2168792c36de9e152c7ecc79a7c00
https://doi.org/10.1007/s10967-007-0535-0
https://doi.org/10.1007/s10967-007-0535-0
Publikováno v:
International Journal of Mass Spectrometry. 261:183-191
This paper presents an improved technique for the precise and accurate determination of Ag isotopic composition in geologic samples. Following the separation of Ag from the rock matrix with a three-stage ion exchange procedure, the isotopic compositi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::010287cb91041346d5264ae67f9e8dba
https://doi.org/10.1016/j.ijms.2006.09.016
https://doi.org/10.1016/j.ijms.2006.09.016