Preprints
https://doi.org/10.31219/osf.io/xhbj6
https://doi.org/10.31219/osf.io/xhbj6
20 Feb 2024
 | 20 Feb 2024

On the viability of detrital Rb-Sr geochronology

Kyle Patrick Larson, Brendan Dyck, Sudip Shrestha, Mark Button, and Yani Najman

Abstract. Re-examination of sediment samples collected from the Bay of Bengal via laser-ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) Rb-Sr geochronology demonstrates the viability of the Rb-Sr system for use as a detrital chronometer. The age population defined by the Rb-Sr dates essentially reproduces that previously published for detrital 40Ar/39Ar dates. The assumed initial 87Sr/86Sr on the calculated population has some influence on the age of the final population, but that influence can be ameliorated by filtering for higher 87Rb/86Sr ratios. The 87Rb/86Sr ratio cut-off used for such filters to minimize the effect of initial 87Sr/86Sr on the final population is strongly dependant on the age of the material being analysed (i.e. ~> 87Rb/86Sr = 500 @ 250 Ma and ~>87Rb/86Sr = 50 @ 2500 Ma). Finally, Ti-in-biotite temperatures calculated based on data collected during LA-ICP-MS overlap with those calculated for the same material based on electron probe microanalyzer data demonstrating the potential for petrochronolgy based on the Rb-Sr system.

Kyle Patrick Larson, Brendan Dyck, Sudip Shrestha, Mark Button, and Yani Najman

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-443', Stijn Glorie, 25 Mar 2024
  • RC2: 'Comment on egusphere-2024-443 by Hugo Olierook', Hugo Olierook, 26 Mar 2024
Kyle Patrick Larson, Brendan Dyck, Sudip Shrestha, Mark Button, and Yani Najman
Kyle Patrick Larson, Brendan Dyck, Sudip Shrestha, Mark Button, and Yani Najman

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Short summary
This study demonstrates the utility of the recently developed laser ablation-based Rb-Sr geochronology methodology to investigate the rates of exhumation and burial in active mountain building systems. It is further demonstrated that additional chemical data collected during spot analyses can be used to determine temperatures recorded in biotite. The method used has advantages over traditional methods in speed, ease of acquisition and the ability to collect additional chemical information.