Geochronology
Geochronology
GChron
Articles | Volume 3, issue 2
Articles | Volume 3, issue 2
https://doi.org/10.5194/gchron-3-545-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gchron-3-545-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 3, issue 2
Research article
 | 
13 Dec 2021
Research article |  | 13 Dec 2021

Deformation recorded in polyhalite from evaporite detachments revealed by 40Ar ∕ 39Ar dating

Lachlan Richards, Fred Jourdan, Alan Stephen Collins, and Rosalind Clare King

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Short summary
This research is part of a PhD thesis examining evaporite detachments characteristics. 40Ar/39Ar geochronology is employed to constrain the timing of formation and deformation events. A diagenetic age of ~514 Ma is interpreted from the oldest significant step age. Other step ages may represent a Cambrian–Permian deformation event or a complex mixing age of diagenetic Ar with partially reset Ar during the Cenozoic. We report the first closure temperature for polyhalite between 254 and 277 °C.
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