Mausoleum (Furnace Creek)
California, Inyo County, Furnace Creek borate district (east of Death Valley), United States
OtherB
- Type
- Lacustrine borates (non-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. Stacked colemanite-only lenses separated by borate-free lake beds; drill hole 123 cuts mafic dikes that may have altered the boron. 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 |
|---|---|---|---|---|
| −1.2 ± 1.7 ‰ | −3.9 / 0.9 ‰ | 6 | colemanite, drill hole 152 (lenses C to E) Mean and standard deviation recalculated from 6 analyses, -3.9 to +0.9 (152 lentille C sommet -1.5; 152 lentille C milieu -1.6; 152 lentille D sommet -1.5; 152 lentille D milieu -3.9; 152 lentille E sommet +0.6; 152 lentille E milieu +0.9). | Swihart et al. (2014), A boron isotope study of the Furnace Creek, California, borate dis… |
| −8.2 ± 3.8 ‰ | −12.7 / −3.3 ‰ | 4 | colemanite, drill hole 123 (lenses A and B) Mean and standard deviation recalculated from 4 analyses, -12.7 to -3.3 (123 lentille A sommet -12.7; 123 lentille A milieu -8.6; 123 lentille B sommet -3.3; 123 lentille B milieu -8.0). Anomalously low values, ascribed to fluids tied to the mafic dikes in the hole. | 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). Mausoleum (Furnace Creek), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/mausoleum-furnace-creek/ (accessed 2026-10-19).
@misc{isofind2026mausoleumfurnacecreekisotopes,
title = {Mausoleum (Furnace Creek), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/mausoleum-furnace-creek/},
note = {Accessed 2026-10-19}
}Updated : 2026-10-19