Geochronology, 2, 343–354, 2020 https://doi.org/10.5194/gchron-2-343-2020 © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License. Expanding the limits of laser-ablation U–Pb calcite geochronology Andrew R. C. Kylander-Clark Department of Earth Science, University of California, Santa Barbara, CA 93106, USA Correspondence: Andrew R. C. Kylander-Clark (
[email protected]) Received: 30 May 2020 – Discussion started: 30 June 2020 Accepted: 20 September 2020 – Published: 23 November 2020 Abstract. U–Pb geochronology of calcite by laser-ablation 1 Introduction inductively coupled plasma mass spectrometry (LA-ICPMS) is an emerging field with potential to solve a vast array Calcite U–Pb geochronology by laser-ablation inductively of geologic problems. Because of low levels of U and Pb, coupled plasma mass spectrometry (LA-ICPMS) is a rela- measurement by more sensitive instruments, such as those tively new technique with untapped potential for solving nu- with multiple collectors (MCs), is advantageous. However, merous geochronologic problems from the timing of faulting whereas measurement of traditional geochronometers (e.g., (e.g., Roberts and Walker, 2016; Nuriel et al., 2017; Good- zircon) by MC-ICPMS has been limited by detection of the fellow et al., 2017) and the age of ore deposits (Burisch daughter isotope, U–Pb dating of calcite can be limited by et al., 2017) to paleoclimate, sedimentation, and diagene- detection of the parent isotope if measured on a Faraday sis (e.g., Mangenot et al., 2018; Rasbury et al., 1997; Hoff detector. The Nu P3D MC-ICPMS employs a new detec- et al., 1995; Winter and Johnson, 1995; Wang et al., 1998; tor array to measure all isotopes of interest on Daly detec- Rasbury et al., 1998).