Franklin
New Jersey, Sussex County, United States
OtherZn (Mn)
- Type
- Metamorphosed stratiform willemite-franklinite-zincite deposit
Stratiform zinc deposit metamorphosed at high grade in Proterozoic marbles, next to Sterling Hill. Indicative coordinates.
δ18O in ‰ (per mil) Values of the same system
Standard : V-SMOW
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 4.7 ± 0.4 ‰ | 4.35 / 5.1 ‰ | 4 | massive willemite (Franklin Furnace and Taylor mine) Mean and standard deviation recalculated from 4 specimens, Table 3. Duplicates averaged per specimen before computation. | Mondillo et al. (2020), New insights into the genesis of willemite (Zn2SiO4) from zinc no… |
| 15.3 ± 4.7 ‰ | 12 / 18.6 ‰ | 2 | acicular willemite with anomalous chemistry (BM1968,874) Mean and standard deviation recalculated from 2 analyses, Table 3. Duplicates averaged per specimen before computation. Two very different measurements of one specimen; formed at about 150 to 200 °C. | Mondillo et al. (2020), New insights into the genesis of willemite (Zn2SiO4) from zinc no… |
| 12.11 ± 2.62 ‰ | 9.72 / 16.05 ‰ | 6 | dolomite of willemite-franklinite ore Mean and standard deviation recalculated from 6 samples, Table 5. Carbon identical to Sterling Hill; oxygen lowered by water-rich fluids. | Peck et al. (2009), Stable isotope and petrologic evidence for the origin of regional mar… |
| 20.04 ± 2.22 ‰ | 14.39 / 21.81 ‰ | 9 | dolomite of the host Franklin Marble Mean and standard deviation recalculated from 9 samples, Table 5. Transect across the orebody; AM-25, at the contact, is depleted (14.39 ‰). | Peck et al. (2009), Stable isotope and petrologic evidence for the origin of regional mar… |
δ13C in ‰ (per mil) Values of the same system
Standard : V-PDB
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.71 ± 0.68 ‰ | −0.54 / 1.52 ‰ | 6 | dolomite of willemite-franklinite ore Mean and standard deviation recalculated from 6 samples, Table 5. Carbon identical to Sterling Hill; oxygen lowered by water-rich fluids. | Peck et al. (2009), Stable isotope and petrologic evidence for the origin of regional mar… |
| 0.06 ± 0.55 ‰ | −0.79 / 0.66 ‰ | 9 | dolomite of the host Franklin Marble Mean and standard deviation recalculated from 9 samples, Table 5. Transect across the orebody; AM-25, at the contact, is depleted (14.39 ‰). | Peck et al. (2009), Stable isotope and petrologic evidence for the origin of regional mar… |
δ66Zn in ‰ (per mil) Values of the same system
Standard : JMC 3-0749L
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.34 ± 0.17 ‰ | 0.09 / 0.44 ‰ | 4 | franklinite Mean and standard deviation recalculated from 4 samples, Table 1. Ore metamorphosed at granulite facies (about 769 °C). | Matt et al. (2022), Zinc isotope constraints on the formation of sedimentary exhalative (… |
| 0.32 ± 0.1 ‰ | 0.23 / 0.43 ‰ | 3 | willemite Mean and standard deviation recalculated from 3 samples, Table 1. Ore metamorphosed at granulite facies (about 769 °C). | Matt et al. (2022), Zinc isotope constraints on the formation of sedimentary exhalative (… |
| 0.38 ± 0.14 ‰ | 0.29 / 0.54 ‰ | 3 | zincite Mean and standard deviation recalculated from 3 samples, Table 1. Ore metamorphosed at granulite facies (about 769 °C). | Matt et al. (2022), Zinc isotope constraints on the formation of sedimentary exhalative (… |
Deposits of the same type
- Furnace Bed (Pikes Peak mine) United States
- Sterling Hill United States
- Tar Hill mine United States
- Splitrock mine United States
- Sulphur Hill mine United States
- Roseville mine United States
- Unnamed mine, Wanaque quadrangle United States
- Howell Farm mine United States
Cite this page
IsoFind Atlas (2026). Franklin, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/franklin/ (accessed 2026-10-13).
@misc{isofind2026franklinisotopesignatures,
title = {Franklin, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/franklin/},
note = {Accessed 2026-10-13}
}Updated : 2026-10-13