Vitoria da Conquista (bentonite)
Bahia, Brazil
Otherbentonite
- Type
- Bentonite (Mg, Ca)
Smectite bentonite deposit. Lateritic alteration: laterite setting, parent material granite, gneiss and amphibolite; soil or meteoric groundwater, below 40 °C alteration; Miocene to Pleistocene. 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 |
|---|---|---|---|---|
| 6.6 ± 2.05 ‰ | 4.1 / 10.6 ‰ | smectite (< 0.2 µm) treated with mannitol Single sample, published mean and 2SD (uncertainty halved to 1σ): KOP2-M +6.6 (2SD 4.1, +4.1 to +10.6, 7.0 µg/g B). | Köster et al. (2019), The boron isotope geochemistry of smectites from sodium, magnesium … | |
| −1 ± 0.35 ‰ | −2.6 / 0.8 ‰ | smectite (< 0.2 µm) treated with mannitol and ammonium-exchanged, structural boron Single sample, published mean and 2SD (uncertainty halved to 1σ): KOP2-A -1.0 (2SD 0.7, -2.6 to +0.8, 5.9 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). Vitoria da Conquista (bentonite), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/vitoria-da-conquista-bentonite/ (accessed 2026-10-20).
@misc{isofind2026vitoriadaconquistabentoniteis,
title = {Vitoria da Conquista (bentonite), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/vitoria-da-conquista-bentonite/},
note = {Accessed 2026-10-20}
}Updated : 2026-10-20