Lower Spadra seam (Arkansas)
Arkansas, Interior Province, United States
Othercharbon (Hg)
- Type
- Coal deposit (semianthracite, Pennsylvanian)
Semianthracite seam of Pennsylvanian age, calorific content of 14,372 Btu; sample PSOC 147 of the DOE Coal Sample Bank (Pennsylvania State University), homogenised and packed under argon; mercury with a mean δ202Hg of -2.98 ‰ and Δ201Hg of +0.05 ‰ (Biswas et al., 2008). Lowest δ202Hg of the coals studied. Coordinates not given.
δ202Hg in ‰ (per mil) Values of the same system
Standard : NIST SRM 3133
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −2.98 ± 0.13 ‰ | 1 | coal (semianthracite) Single subsample; uncertainty = 2SD of 3 replicate analyses; lowest δ202Hg of the coals studied. | Biswas et al. (2008), Natural mercury isotope variation in coal deposits and organic soil… |
Δ201Hg in ‰ (per mil) Values of the same system
Standard : NIST SRM 3133
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.05 ± 0.04 ‰ | 1 | coal (semianthracite) Single subsample; uncertainty = 2SD of 3 replicate analyses; lowest δ202Hg of the coals studied. | Biswas et al. (2008), Natural mercury isotope variation in coal deposits and organic soil… |
Δ199Hg in ‰ (per mil) Values of the same system
Standard : NIST SRM 3133
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.08 ± 0.1 ‰ | 1 | coal (semianthracite) Single subsample; uncertainty = 2SD of 3 replicate analyses; lowest δ202Hg of the coals studied. | Biswas et al. (2008), Natural mercury isotope variation in coal deposits and organic soil… |
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Cite this page
IsoFind Atlas (2026). Lower Spadra seam (Arkansas), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/couche-lower-spadra-arkansas/ (accessed 2026-10-15).
@misc{isofind2026lowerspadraseamarkansasisotop,
title = {Lower Spadra seam (Arkansas), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/couche-lower-spadra-arkansas/},
note = {Accessed 2026-10-15}
}Updated : 2026-10-15