East Coleman (Furnace Creek)
California, Inyo County, Furnace Creek borate district (east of Death Valley), United States
OtherB
- Type
- Lacustrine borates (zoned), Furnace Creek Formation
Borate deposit of the Furnace Creek Formation (Miocene-Pliocene, extensional Basin and Range basin, over 600 km² between the Funeral and Black Mountains); about thirty borate lenses in calcareous lacustrine sediments, some zoned (probertite or ulexite core surrounded by colemanite), others colemanite-only. Swihart et al. (2014): probertite near +5 ‰, colemanite mostly near -1 ‰, the heavier boron of the Na-Ca core reflecting the ancestral lake and its springs, the lighter colemanite the alteration of Na-Ca borates by downward-migrating lake water. Zoned deposit sampled at surface; two colemanites as heavy as probertite, possibly from the weathered Na-Ca zone. Coordinates not published (district map only).
δ11B in ‰ (per mil) Values of the same system
Standard : NIST SRM 951
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.4 ± 3.9 ‰ | −5 / 4.8 ‰ | 6 | colemanite (weathered exposures) Mean and standard deviation recalculated from 6 analyses, -5.0 to +4.8 (1A1 base de cristal +4.8; 1A2 pointe -1.1; 1C -2.7; 2 -5.0; 3 +2.9; 3 répétition +3.4). 10 ‰ spread, possibly due to surface weathering. | Swihart et al. (2014), A boron isotope study of the Furnace Creek, California, borate dis… |
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Cite this page
IsoFind Atlas (2026). East Coleman (Furnace Creek), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/east-coleman-furnace-creek/ (accessed 2026-10-19).
@misc{isofind2026eastcolemanfurnacecreekisotop,
title = {East Coleman (Furnace Creek), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/east-coleman-furnace-creek/},
note = {Accessed 2026-10-19}
}Updated : 2026-10-19