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Geochronology Advances in geochronological science
Journal topic
Preprints
https://doi.org/10.5194/gchron-2020-17
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gchron-2020-17
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  30 Jun 2020

30 Jun 2020

Review status
A revised version of this preprint was accepted for the journal GChron and is expected to appear here in due course.

Expanding Limits of Laser-Ablation U-Pb Calcite Geochronology

Andrew R. C. Kylander-Clark Andrew R. C. Kylander-Clark
  • Department of Earth Science, University of California, Santa Barbara, CA 93106, USA

Abstract. U-Pb geochronology of calcite by laser-ablation inductively-coupled mass spectrometry (LA-ICMPS) is an emerging field with potential to solve a vast array of geologic problems. Because of low levels of U and Pb, measurement by more sensitive instruments, such as those with multiple collectors (MC), is advantageous. However, whereas measurement of traditional geochronometers (e.g., zircon) by MC-ICPMS has been limited by detection of the daughter isotope, U-Pb dating of calcite can be limited by detection of the parent isotope, if measured on a Faraday detector. The Nu P3D MC-ICPMS employs a new detector array to measure all isotopes of interest on Daly detectors. A new method, described herein, utilizes the low detection limit and high dynamic range of the Nu P3D for calcite U-Pb geochronology, and compares it with traditional methods. A model is created to explore the limits of U, Pb, and U/Pb ratios that can be measured by LA-ICPMS and can serve as a guide to evaluate potential candidate materials for geochronology.

Andrew R. C. Kylander-Clark

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Interactive discussion

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Status: closed
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Andrew R. C. Kylander-Clark

Andrew R. C. Kylander-Clark

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Latest update: 26 Sep 2020
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Short summary
This manuscript describes a new method of U-Pb calcite dating by laser ablation using a new detector array that allows for higher precision and lower limits of detection. This method thereby increases the likelihood of success in dating any given sample. I also explore how concentration of U and Pb, laser spot size and repetition rate, and mass spectrometer selection influence the final precision on the age, as to make recommendations for those interested in dating such samples.
This manuscript describes a new method of U-Pb calcite dating by laser ablation using a new...
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