Bangor Co
Tibet (Xizang), Nagqu Prefecture, Bangong-Nujiang suture, China
OtherB (Li, K)
- Type
- Salt-lake brine and lacustrine borax
Salt lake at 4522 m in a faulted basin of the Bangong-Nujiang suture, 8 km east of Siling Co, divided into three lakes (Bangor Co I to III); arid climate (less than 150 mm rain, 2200 to 2500 mm evaporation). Coordinates not published. Over 3 Mt boron in total, including over 1.1 Mt of solid ore (borax, on the floor and shores of lake II); mirabilite and hydromagnesite. Na-SO4 brines with 817-1113 mg/L B. Li et al. (2022): boron supplied by high-δ11B recharge waters (Graza River, northern springs) and low-δ11B southern springs, uneven mixing of lake water; no significant fractionation during salt precipitation.
δ11B in ‰ (per mil) Values of the same system
Standard : NIST SRM 951
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.82 ± 0.58 ‰ | 0.38 / 1.48 ‰ | 3 | Bangor Co II lake brine (dissolved boron) Mean and standard deviation recalculated from 3 analyses, +0.38 to +1.48 (BG-10 +0.38; BG-11 +1.48; BG-12 +0.59). 876 to 1052 mg/L B, pH 9.0 to 9.2. | Li et al. (2022), Boron isotope geochemistry of Bangor Co Salt Lake (central Tibet): impl… |
| 1.42 ± 1.13 ‰ | 0.54 / 3.59 ‰ | 6 | Bangor Co III lake brine (dissolved boron) Mean and standard deviation recalculated from 6 analyses, +0.54 to +3.59 (BG-13 +0.54; BG-14 +0.56; BG-15 +3.59; BG-16 +1.45; BG-17 +1.07; BG-18 +1.29). 817 to 1113 mg/L B. BG-15 is printed "BG-12" in both tables. | Li et al. (2022), Boron isotope geochemistry of Bangor Co Salt Lake (central Tibet): impl… |
| −3.59 ‰ | 1 | intercrystal brine Single analysis (BGI-19). 1313 mg/L B, pH 9.2; representative of the evolved brine according to the authors. Qi et al. (1993) gave +3.44 ‰. | Li et al. (2022), Boron isotope geochemistry of Bangor Co Salt Lake (central Tibet): impl… | |
| −3.75 ‰ | 1 | borax from the eastern shore Single analysis (BGS-19). | Li et al. (2022), Boron isotope geochemistry of Bangor Co Salt Lake (central Tibet): impl… | |
| 0.41 ± 3.37 ‰ | −1.97 / 2.79 ‰ | 2 | hydromagnesite (recent and older) Mean and standard deviation recalculated from 2 analyses, -1.97 to +2.79 (SLM-01 -1.97; SLM-02 +2.79). SLM-01 recently formed, SLM-02 older; little different from the brines. | Li et al. (2022), Boron isotope geochemistry of Bangor Co Salt Lake (central Tibet): impl… |
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Cite this page
IsoFind Atlas (2026). Bangor Co, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/bangor-co/ (accessed 2026-10-19).
@misc{isofind2026bangorcoisotopesignatures,
title = {Bangor Co, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/bangor-co/},
note = {Accessed 2026-10-19}
}Updated : 2026-10-19