Hosko (Hattu schist belt)
North Karelia, Ilomantsi, Hattu schist belt, Finland
Orogenic goldAu
- Type
- Orogenic gold in turbiditic metasediments
Archaean schist belt (2.76 to 2.72 Ga) of the Karelian domain, with felsic to intermediate volcano-sedimentary rocks cut by tonalites, granodiorites and felsic porphyries; Au-Bi-Te gold in shear zones, older than the metamorphic peak (500 to 600 °C, 3 to 5 kbar, about 2.70 Ga). Folded auriferous quartz-tourmaline-sulphide veins in strongly sericitized turbiditic metasediments, with tourmalinites; no felsic porphyry. Molnár et al. (2016): tourmaline δ11B, sulphide δ34S and chalcopyrite δ65Cu.
δ11B in ‰ (per mil) Values of the same system
Standard : NIST SRM 951
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| −22.6 ± 1.1 ‰ | −24.1 / −20 ‰ | 19 | metasomatic-hydrothermal tourmaline of metasediments (type 4) (1_HOST) Mean and standard deviation recalculated from 19 analyses, -24.1 to -20.0 (-21.6; -21.2; -23.8; -23.7; -23.3; -23.1; -22.8; -24.1; -23.0; -22.6; -22.9; -24.1; -22.1; -22.5; -23.6; -20.0; -22.2; -21.1; -22.6). 9 core and 10 rim analyses; published mean -22.6 ‰. Southern part of the deposit; lowest values of the belt. | Molnár et al. (2016), Boron, sulphur and copper isotope systematics in the orogenic gold … |
| −19 ± 0.9 ‰ | −20.8 / −17.3 ‰ | 20 | tourmalinite of metasediments (type 4) (2_HOST) Mean and standard deviation recalculated from 20 analyses, -20.8 to -17.3 (-18.3; -18.6; -18.9; -18.6; -19.9; -18.6; -17.3; -17.8; -20.8; -19.2; -18.2; -18.6; -20.1; -19.9; -18.1; -18.6; -20.1; -20.0; -19.3; -19.9). 11 core and 9 rim analyses; published mean -19.0 ‰. Tourmaline associated with Bi-Te minerals. | Molnár et al. (2016), Boron, sulphur and copper isotope systematics in the orogenic gold … |
δ34S in ‰ (per mil) Values of the same system
Standard : V-CDT
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 1.7 ± 0.3 ‰ | 0.7 / 2.8 ‰ | 42 | pyrrhotite of metasediments Mean and standard deviation recalculated from the means of 4 samples (ASKA2012-14 +2.1 (n = 9); ASKA2012-17A +1.5 (n = 14); ASKA2012-14-7 +1.6 (n = 7); HOS-38 +1.7 (n = 12)), i.e. 42 spot analyses from +0.7 to +2.8 ‰. | Molnár et al. (2016), Boron, sulphur and copper isotope systematics in the orogenic gold … |
| 0.7 ‰ | 1 | chalcopyrite of metasediments Single spot analysis (sample HOS-38). | Molnár et al. (2016), Boron, sulphur and copper isotope systematics in the orogenic gold … |
Deposits of the same type
- Muruntau Uzbekistan
- Kalgoorlie (Golden Mile) Australia
- Victorian Goldfields Australia
- Ashanti (Obuasi) Ghana
- Loulo (district de Gara-Yalea) Mali
- Gounkoto Mali
- Massawa Senegal
- Kirkland Lake (Macassa mine) Canada
Cite this page
IsoFind Atlas (2026). Hosko (Hattu schist belt), isotope signatures. https://www.isofind.tech/isotopes/en/deposits/hosko-ceinture-de-hattu/ (accessed 2026-10-19).
@misc{isofind2026hoskohattuschistbeltisotopesi,
title = {Hosko (Hattu schist belt), isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/hosko-ceinture-de-hattu/},
note = {Accessed 2026-10-19}
}Updated : 2026-10-19