Articles | Volume 34, issue 1
https://doi.org/10.5194/ejm-34-7-2022
https://doi.org/10.5194/ejm-34-7-2022
Research article
 | 
12 Jan 2022
Research article |  | 12 Jan 2022

40Ar/39Ar dating of a hydrothermal pegmatitic buddingtonite–muscovite assemblage from Volyn, Ukraine

Gerhard Franz, Masafumi Sudo, and Vladimir Khomenko

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Cited articles

Barker, D. S.: Ammonium in alkali feldspars, Amer. Mineral., 49, 851–858, 1964. 
Dai, S., Xie, P., French, D., Ward, C. R., Graham, I. T., Yan, X., and Guo, W.: The occurrence of buddingtonite in super-high-organic-sulphur coals from the Yishan Coalfield, Guangxi, southern China, Intern. J. Coal Geol., 195, 347–361, 2018. 
Day, R. and Jones, B.: Variations in water content in opal-A and opal-C-T from geyser discharge aprons, J. Sed. Res., 78, 301–315, 2008. 
Di Vicenzo, G., Ghiribelli, B., Giorgetti, G., and Palmeri, R.: Evidence of a close link between petrology and isotope records: constraints from SEM, EMP, TEM and in situ 40Ar-39Ar laser analyses on multiple generations of white micas (Lanterman Range, Antarctica), Earth. Planet. Sci. Let., 192, 389–405, 2001. 
Erd, R. C., White, D. E., Fahey, J. J., and Lee, D. E.: Buddingtonite, an ammonium feldspar with zeolitic water, Amer. Mineral., 49, 831–850, 1964. 
Short summary
The age of formation of buddingtonite, ammonium-bearing feldspar, can be dated with the Ar–Ar method; however, it may often give only minimum ages due to strong resetting. In the studied example it gives a Precambrian minimum age of fossils, associated with this occurrence, and the age of the accompanying mineral muscovite indicates an age near 1.5 Ga. We encourage more dating attempts of buddingtonite, which will give valuable information of diagenetic or hydrothermal events.