Dating of polyhalite: a difficult ⁴⁰Ar/³⁹Ar dating tool of diagenetic to very low-grade metamorphic processes.

ABSTRACT: Halite already deforms at surface temperatures. A valuable universal dating tool to constrain the timing of sedimentary, diagenetic, or deformational structures is still missing. The evaporite mineral polyhalite can be dated by the ⁴⁰Ar/³⁹Ar method. On the example of the extremely deformed halite deposits of the Eastern Alps, polyhalite was tested to date early diagenetic stages of the deposits. The sedimentological investigation of the present study indicates that some of the macrostructures of polyhalite had a syn-depositional origin during the late Permian. It is supposed that polyhalite originated during reflux of brines. All samples selected for age dating represent characteristic microfabric types of euhedral to subhedral polyhalite crystals. Intact macro- and n

SUBMITTER: Leitner C 

PROVIDER: S-EPMC9334404 | biostudies-literature | 2022

REPOSITORIES: biostudies-literature