Preprints
https://doi.org/10.5194/gchron-2024-6
https://doi.org/10.5194/gchron-2024-6
14 Feb 2024
 | 14 Feb 2024
Status: this preprint is currently under review for the journal GChron.

Technical note: a new analytical protocol for apatite (U-Th)/He and trace element analysis (incorporating a continuous ramped heating measurement system for the He)

Alexis Derycke, Nathan Cogné, Dominique Bavay, David Vilbert, Lionel Dutruch, Sebastien Ternois, Gilles Ruffet, Marc Jolivet, and Kerry Gallagher

Abstract. 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.

Alexis Derycke, Nathan Cogné, Dominique Bavay, David Vilbert, Lionel Dutruch, Sebastien Ternois, Gilles Ruffet, Marc Jolivet, and Kerry Gallagher

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • AC1: 'Comment on gchron-2024-6', Alexis Derycke, 20 Feb 2024
  • AC2: 'Comment on gchron-2024-6', Alexis Derycke, 21 Feb 2024
  • RC1: 'Comment on gchron-2024-6', Anonymous Referee #1, 29 Feb 2024
  • RC2: 'Comment on gchron-2024-6', James Metcalf, 12 Mar 2024
  • RC3: 'Comment on gchron-2024-6', Anonymous Referee #3, 13 Mar 2024
  • RC4: 'Comment on gchron-2024-6', Bruce Idleman, 23 Mar 2024
Alexis Derycke, Nathan Cogné, Dominique Bavay, David Vilbert, Lionel Dutruch, Sebastien Ternois, Gilles Ruffet, Marc Jolivet, and Kerry Gallagher
Alexis Derycke, Nathan Cogné, Dominique Bavay, David Vilbert, Lionel Dutruch, Sebastien Ternois, Gilles Ruffet, Marc Jolivet, and Kerry Gallagher

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Short summary
This note details a development of the (U-Th)/He method for dating apatite crystals in low-temperature thermochronology. Our innovation simplifies analysis protocols for gases (He) and crystals (U, Th, etc.), aiming to expedite data production and enhance study reliability.