Lowell (bentonite)

Wyoming, United States

Otherbentonite

Type: Bentonite (Na)

Smectite bentonite deposit. Mainly marine deposition: distal brackish prodelta to offshore marine setting, parent material likely rhyolitic ash, or andesitic to dacitic; diagenesis or seawater alteration; Albian to Late Cenomanian. 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
−12.6 ± 1.7 ‰	−15.4 / −9.3 ‰		smectite (< 0.2 µm) treated with mannitol Mean and standard deviation recalculated from the means of 3 samples: MOFO-M -12.2 (2SD 1.3, -13.0 to -10.0, 42.4 µg/g B); MOFR-M -14.5 (2SD 0.9, -15.4 to -13.9, 19.0 µg/g B); MOHO-M -11.2 (2SD 1.5, -12.9 to -9.3, 66.2 µg/g B).	Köster et al. (2019), The boron isotope geochemistry of smectites from sodium, magnesium …
−13.3 ± 0.45 ‰	−14.8 / −12.4 ‰		smectite (< 0.2 µm) treated with mannitol and ammonium-exchanged, structural boron Single sample, published mean and 2SD (uncertainty halved to 1σ): MOHO-A -13.3 (2SD 0.9, -14.8 to -12.4, 64.8 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). Lowell (bentonite), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/lowell-bentonite/ (accessed 2026-10-20).

@misc{isofind2026lowellbentoniteisotopesignatu,
  title = {Lowell (bentonite), isotope signatures},
  author = {{IsoFind Atlas}},
  year = {2026},
  url = {https://www.isofind.tech/isotopes/en/deposits/lowell-bentonite/},
  note = {Accessed 2026-10-20}
}

Updated : 2026-10-20