| Autor: |
Derycke, Alexis, Cogné, Nathan, Bavay, Dominique, Vilbert, David, Dutruch, Lionel, Ternois, Sebastien, Ruffet, Gilles, Jolivet, Marc, Gallagher, Kerry |
| Zdroj: |
Geochronology; 2/14/2024, p1-24, 24p |
| Abstrakt: |
This study details the procedures developed between 2021 and 2023 at the Géosciences Rennes lab (GeOHeLiS plateform, Rennes University, France) for obtaining precise (U–Th)/He thermochronological data on apatite. The methodology involves crystal selection, measuring helium (4He) content by heating crystals, and analyzing them using noble gas mass spectrometry. Additionally, determining U, Th, and Sm contents is achieved through crystal dissolution and subsequent solution analysis with triple-quadrupole mass spectrometry (QQQ-MS). Emphasis is placed on a new approach to quadrupole 4He sensitivity calibration based on Durango apatite, ensuring a precision of ~3.9 % in 4He content determination. The study also highlights the development of a 'ramped heating – direct analysis' protocol used to screen apatite diffusion behaviour. In addition, a new quantification protocol for major and trace elements measured in apatite is presented, employing a standard concentration range approach rather than the isotopic spiking technique commonly used for (U-Th)/He studies. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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