Askana (bentonite)
Guria, Géorgie
Otherbentonite
- Type
- Bentonite (Na, Ca)
Smectite bentonite deposit. Mainly marine deposition: marine volcano-sedimentary, probably proximal setting, parent material andesitic to trachytic pyroclastics; submarine hydrothermal alteration; Eocene. Köster et al. (2019): δ11B of purified smectites and fluid δ11B calculated for trigonal or tetrahedral boron at 25 and 90 °C.
δ11B in ‰ (per mil) Values of the same system
Standard : NIST SRM 951
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 8.1 ± 0.85 ‰ | 6.4 / 9.2 ‰ | smectite (< 0.2 µm) treated with mannitol Single sample, published mean and 2SD (uncertainty halved to 1σ): B17-M +8.1 (2SD 1.7, +6.4 to +9.2, 47.6 µg/g B). | Köster et al. (2019), The boron isotope geochemistry of smectites from sodium, magnesium … | |
| 4.5 ± 0.7 ‰ | 2.4 / 6.3 ‰ | smectite (< 0.2 µm) treated with mannitol and ammonium-exchanged, structural boron Single sample, published mean and 2SD (uncertainty halved to 1σ): B17-A +4.5 (2SD 1.4, +2.4 to +6.3, 38.8 µg/g B). | Köster et al. (2019), The boron isotope geochemistry of smectites from sodium, magnesium … |
Deposits of the same type
- Central African Copperbelt (whole province) DR Congo and Zambia
- Witwatersrand basin South Africa
- Stelvio Italy
- Oris Italy
- Kupferschiefer, Lubin-Sieroszowice district Poland
- Timna Israël
- Datangpo-type manganese (Gaolou, Minle, Zhenxing) China
- Eyller Bruch bog iron ore Germany
Cite this page
IsoFind Atlas (2026). Askana (bentonite), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/askana-bentonite/ (accessed 2026-10-20).
@misc{isofind2026askanabentoniteisotopesignatu,
title = {Askana (bentonite), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/askana-bentonite/},
note = {Accessed 2026-10-20}
}Updated : 2026-10-20