First absolute dating of Miocene langbeinite evaporites by 40Ar/39Ar laser step-heating: [K2Mg2(SO4)3] Stebnyk mine (Carpathian Foredeep Basin).

Details First absolute dating of Miocene langbeinite evaporites by 40Ar/39Ar laser step-heating: [K2Mg2(SO4)3] Stebnyk mine (Carpathian Foredeep Basin). First absolute dating of Miocene langbeinite evaporites by 40Ar/39Ar laser step-heating: [K2Mg2(SO4)3] Stebnyk mine (Carpathian Foredeep Basin).

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.4347l&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 23, p. 4347-4350

Physics

Geochemistry: Geochronology, Geochemistry: Low-Temperature Geochemistry

Scientific paper

Four langbeinite [K2Mg2(SO4)3] single grains from the Stebnyk evaporite mine have been dated with the laser step-heating 40Ar/39Ar method. These yield very clustered ages, including a high quality plateau age of 14.31 +/- 0.06 Ma for 99.5% 39ArK released. These Middle Miocene ages disagree with the inferred Early Miocene age of the Stebnyk deposit [Peryt and Kovalevich, 1997]. Therefore, langbeinite may be formed after primary evaporite deposition in a maximum time interval around 7.5 Ma, during a diagenetic process or as a result of a fluid circulation. However the stratigraphic age may have been also overestimated due to a complicated tectonic history and the absence of clear stratigraphic markers. This work confirms the suitability of langbeinite for 40Ar/39Ar dating. Langbeinite in evaporites may thus be used for stratigraphic dating when primary, or for dating diagenesis or fluid circulation when secondary.

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