Deformation recorded in polyhalite from evaporite detachments revealed by <sup>40</sup>Ar ∕ <sup>39</sup>Ar dating
Abstract [ K 2 Ca 2 Mg (SO 4) 4 ⚫ 2 H 2 O ] grains taken from potash marl and crystalline halite samples are used as geochronometers to date the formation and identify the closure temperature of the mineral polyhalite using the 40 Ar/39 Ar step-heating laser and furnace methods. The diffusion characteristics measured for two samples of polyhalite are diffusivity (D 0 E a % 39 Ar. These values correspond to a closure temperature of ca. 254 and 277 ∘ C for a cooling rate of 10 ∘ C Myr- 1 40 Ar/39 Ar age results for both samples did not return any reliable crystallisation age. This is not unexpected as polyhalite is prone to 40 Ar * K/Ar system. An oldest minimum heating step age of ∼ 514 Ma from sample 06-3.1 corresponds relatively well to the established early Cambrian age of the formation. Samples 05-P2 and 05-W2 have measured step ages and represent a deformation event that partially reset the K/Ar system based on oldest significant ages between ca. 381 and 415 Ma. We interpret the youngest measured step ages, between ca. 286 and 292 Ma, to represent the maximum age of deformation-induced recrystallisation. Both the youngest and oldest measured step ages for samples 05-P2 and 05-W2 occur within the time of a major unconformity in the area. These dates may reflect partial resetting of the K/Ar system from meteoric water infiltration and recrystallisation during this non-depositional time. Otherwise, they may result from mixing of Ar derived by radiogenic decay after Cambrian precipitation with partially reset Ar from pervasive Cenozoic deformation and physical recrystallisation.
- Location
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Deutsche Nationalbibliothek Frankfurt am Main
- Extent
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Online-Ressource
- Language
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Englisch
- Bibliographic citation
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Deformation recorded in polyhalite from evaporite detachments revealed by 40Ar ∕ 39Ar dating ; volume:3 ; number:2 ; year:2021 ; pages:545-559 ; extent:15
Geochronology ; 3, Heft 2 (2021), 545-559 (gesamt 15)
- Creator
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Richards, Lachlan
Jourdan, Fred
Collins, Alan Stephen
King, Rosalind Clare
- DOI
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10.5194/gchron-3-545-2021
- URN
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urn:nbn:de:101:1-2021121604491097810751
- Rights
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Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
- Last update
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15.08.2025, 7:31 AM CEST
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Associated
- Richards, Lachlan
- Jourdan, Fred
- Collins, Alan Stephen
- King, Rosalind Clare
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