Cemetery (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. Least deformed zoned lens of the district (thickness/length ratio about 1/10): upper and lower colemanite, mixed interval, probertite core from 182.9 to 236.2 m in drill hole R-101. 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 |
|---|---|---|---|---|
| −0.5 ± 1.3 ‰ | −2.2 / 1.3 ‰ | 6 | colemanite of the upper, lower and marginal zones Mean and standard deviation recalculated from 6 analyses, -2.2 to +1.3 (R-93 157,6 m -0.8; R-94 128,9 m -2.2; R-101 178,9 m +1.3; R-101 182,6 m -1.2; R-101 236,2 m +0.7; R-101 239,0 m -0.5). Upper and lower zones near 0 ‰; mean offset of 4.7 ‰ from the R-101 probertite, 6.5 ‰ for marginal colemanite. | Swihart et al. (2014), A boron isotope study of the Furnace Creek, California, borate dis… |
| 4.8 ± 0.5 ‰ | 4.2 / 5.5 ‰ | 4 | probertite of the Na-Ca core Mean and standard deviation recalculated from 4 analyses, +4.2 to +5.5 (189,9 m +4.2; 217,6 m +5.5; 234,4 m +4.7; 236,2 m +4.9). Composition of the ancestral lake and its springs early in deposition according to the authors; the 4.2 ‰ offset from colemanite at the lower contact exceeds the calculated equilibrium (1.8 to 2.6 ‰). | Swihart et al. (2014), A boron isotope study of the Furnace Creek, California, borate dis… |
| 3.9 ‰ | 1 | ulexite of the upper colemanite zone Single analysis (R-101 178,9 m). Coexists with colemanite at +1.3 ‰ (2.6 ‰ offset, consistent with equilibrium). | 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). Cemetery (Furnace Creek), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/cemetery-furnace-creek/ (accessed 2026-10-19).
@misc{isofind2026cemeteryfurnacecreekisotopesi,
title = {Cemetery (Furnace Creek), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/cemetery-furnace-creek/},
note = {Accessed 2026-10-19}
}Updated : 2026-10-19