Journal cover Journal topic
Geochronology Advances in geochronological science
Journal topic
Preprints
https://doi.org/10.5194/gchron-2020-26
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gchron-2020-26
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  25 Aug 2020

25 Aug 2020

Review status
This preprint is currently under review for the journal GChron.

Novel method for determining 234U-238U ages of Devils Hole 2 cave calcite

Xianglei Li1, Kathleen A. Wendt1,2, Yuri Dublyansky2, Gina E. Moseley2, Christoph Spötl2, and R. Lawrence Edwards1 Xianglei Li et al.
  • 1Department of Earth Sciences, University of Minnesota, 116 Church Street SE, Minneapolis 55455, USA
  • 2Institute of Geology, University of Innsbruck, Innrain 52, 6020 Innsbruck, Austria

Abstract. Uranium-uranium (234U-238U) dating can determine the age of secondary carbonates over greater time intervals than the well-established 230Th-234U dating method. Yet it is rarely applied due to unknowns surrounding the initial δ234U (δ234Ui) value, which result in significant age uncertainties. In order to understand the δ234Ui in Devils Hole 2 cave, we have precisely determined 110 δ234Ui values from phreatic calcite crusts using a 230Th-234U chronology. The sampled calcite crusts were deposited in Devils Hole 2 between 4 and 590 thousand years, providing a long-term look at δ234Ui variability over time. We then performed multi-linear regressions among the δ234Ui values and correlative δ18O and δ13C values. These regressions allow us to predict the δ234Ui value of Devils Hole calcite based upon its δ18O and δ13C. Using this approach and measured present-day &felta;234U values, we calculate 110 independent 234U-238U ages of Devils Hole 2 cave deposits. In addition, we used newly measured δ18O, δ13C, and present-day δ234U values to calculate 10 234U-238U ages that range between 676 and 731 thousand years, thus allowing us to extend the Devils Hole chronology beyond the 230Th-234U-dated chronology while maintaining an age precision of ~2 %. Our results indicate that calcite deposition at Devils Hole 2 cave began no later than 736 ± 11 thousand years ago. The novel method presented here may be used in future speleothem studies in similar hydrogeological settings, given appropriate calibration studies.

Xianglei Li et al.

Interactive discussion

Status: open (until 06 Oct 2020)
Status: open (until 06 Oct 2020)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
[Subscribe to comment alert] Printer-friendly Version - Printer-friendly version Supplement - Supplement

Xianglei Li et al.

Viewed

Total article views: 281 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
212 64 5 281 25 4 2
  • HTML: 212
  • PDF: 64
  • XML: 5
  • Total: 281
  • Supplement: 25
  • BibTeX: 4
  • EndNote: 2
Views and downloads (calculated since 25 Aug 2020)
Cumulative views and downloads (calculated since 25 Aug 2020)

Viewed (geographical distribution)

Total article views: 143 (including HTML, PDF, and XML) Thereof 141 with geography defined and 2 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Cited

Saved

No saved metrics found.

Discussed

No discussed metrics found.
Latest update: 26 Sep 2020
Publications Copernicus
Download
Short summary
In this study, we built a statistical model to determine the initial δ234U in submerged calcite crusts that coat the walls of Devils Hole 2 (DH2) cave (Nevada, USA) and, using 234U-238U dating method, extended the chronology of the calcite depostion beyond the previous well-established 230Th ages, and determined the oldest calcite deposited in this cave, a time marker for cave genesis. The novel method presented here may be used in future speleothem studies in similar hydrogeological settings.
In this study, we built a statistical model to determine the initial δ234U in submerged calcite...
Citation