La Tranquera (bentonite)
San Juan, Argentina
Otherbentonite
- Type
- Bentonite (Na, Mg)
Smectite bentonite deposit. Mainly terrestrial deposition: distal limnic to fluvial playa setting, parent material acidic to intermediate volcanics; playa and incipient soils alteration; Hettangian to Toarcian. 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 |
|---|---|---|---|---|
| 17.1 ± 2 ‰ | 13.3 / 20 ‰ | smectite (< 0.2 µm) treated with mannitol Single sample, published mean and 2SD (uncertainty halved to 1σ): B23-M +17.1 (2SD 4.0, +13.3 to +20.0, 41.3 µg/g B). | Köster et al. (2019), The boron isotope geochemistry of smectites from sodium, magnesium … | |
| −30.1 ± 0.15 ‰ | −30.3 / −30 ‰ | smectite (< 0.2 µm) treated with mannitol and ammonium-exchanged, structural boron Single sample, published mean and 2SD (uncertainty halved to 1σ): B23-A -30.1 (2SD 0.3, -30.3 to -30.0, 39.7 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). La Tranquera (bentonite), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/la-tranquera-bentonite/ (accessed 2026-10-20).
@misc{isofind2026latranquerabentoniteisotopesi,
title = {La Tranquera (bentonite), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/la-tranquera-bentonite/},
note = {Accessed 2026-10-20}
}Updated : 2026-10-20