Angeria (bentonite)
Milos (Cyclades), Greece
Otherbentonite
- Type
- Bentonite (Ca, Mg)
Smectite bentonite deposit. Mainly marine deposition: proximal marine volcano-sedimentary setting, parent material andesitic to dacitic pyroclastics; hydrothermal or seawater, 30 to 90 °C alteration; Pliocene to Pleistocene (3.5 to 0.09 Ma). 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 |
|---|---|---|---|---|
| 5.6 ± 1 ‰ | 1.4 / 13 ‰ | smectite (< 0.2 µm) treated with mannitol Single sample, published mean and 2SD (uncertainty halved to 1σ): ANG-M +5.6 (2SD 2.0, +1.4 to +13.0, 25.1 µg/g B). | Köster et al. (2019), The boron isotope geochemistry of smectites from sodium, magnesium … | |
| 2.7 ± 0.6 ‰ | −0.3 / 3.1 ‰ | smectite (< 0.2 µm) treated with mannitol and ammonium-exchanged, structural boron Single sample, published mean and 2SD (uncertainty halved to 1σ): ANG-A +2.7 (2SD 1.2, -0.3 to +3.1, 26.5 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). Angeria (bentonite), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/angeria-bentonite/ (accessed 2026-10-20).
@misc{isofind2026angeriabentoniteisotopesignat,
title = {Angeria (bentonite), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/angeria-bentonite/},
note = {Accessed 2026-10-20}
}Updated : 2026-10-20