Fallon (bentonite)
Nevada, United States
Otherbentonite
- Type
- Bentonite (Na)
Smectite bentonite deposit. Mainly terrestrial deposition: saline-alkaline playa, probably distal setting, parent material rhyolitic to dacitic volcanics; hydrothermal, brine or lake water, possibly 20 to 80 °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 |
|---|---|---|---|---|
| −22 ± 1.55 ‰ | −32.1 / −19.9 ‰ | smectite (< 0.2 µm) treated with mannitol Single sample, published mean and 2SD (uncertainty halved to 1σ): B51-M -22.0 (2SD 3.1, -32.1 to -19.9, 145.9 µg/g B). | Köster et al. (2019), The boron isotope geochemistry of smectites from sodium, magnesium … | |
| −21.5 ± 0.55 ‰ | −22.7 / −20.8 ‰ | smectite (< 0.2 µm) treated with mannitol and ammonium-exchanged, structural boron Single sample, published mean and 2SD (uncertainty halved to 1σ): B51-A -21.5 (2SD 1.1, -22.7 to -20.8, 153.5 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). Fallon (bentonite), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/fallon-bentonite/ (accessed 2026-10-20).
@misc{isofind2026fallonbentoniteisotopesignatu,
title = {Fallon (bentonite), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/fallon-bentonite/},
note = {Accessed 2026-10-20}
}Updated : 2026-10-20