Hochgrössen

Styria, Hochgrössen massif (linked to the Speik Complex), Austria

Magmatic (Ni-Cu-PGE, carbonatites)Cr (EGP)

Type: Podiform chromitites in an ophiolite

Metamorphosed dunite and harzburgite massif, dismembered mantle relic of an ophiolite (Speik Complex, Eastern Alps), probably Late Proterozoic to Early Paleozoic; podiform chromitites as small layers, lenses and pods (less than 0.5 m thick). Only massif where a pre-Variscan high-pressure (eclogite) metamorphism is recognised; its link to the Speik Complex is debated. Chromitite HG 71, from a large outcrop in the northwest of the massif, is massive with chlorite, Ni arsenide and Ni sulphide inclusions; laurite makes up 75 % of platinum-group minerals (Malitch et al., 2003).

187Os/188Os isotope ratio, no unit Values of the same system

Standard : Rapport absolu, sans standard de référence

Value	Range	n	Mineral or matrix	Source
0.12166 ± 0.0032	0.1194 / 0.12392	2	laurite (single grains), chromitite HG 71 Mean and standard deviation recalculated from 2 analyses, 0.11940 to 0.12392 (HG 71-1 0.11940; HG 71-2 0.12392). Two grains only, within the Kraubath range. Model ages: HG 71-1 1.264 Ga; HG 71-2 0.645 Ga.	Malitch et al. (2003), Laurite and ruarsite from podiform chromitites at Kraubath and Hoc…

Deposits of the same type

Bayan Obo China
Norilsk-Talnakh Russia
Bushveld, Merensky Reef South Africa
Bushveld, UG2 chromitite South Africa
Bushveld, Platreef South Africa
Sudbury Canada
Voisey's Bay Canada
Rössing Namibia

Cite this page

IsoFind Atlas (2026). Hochgrössen, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/hochgrossen/ (accessed 2026-10-20).

@misc{isofind2026hochgrossenisotopesignatures,
  title = {Hochgrössen, isotope signatures},
  author = {{IsoFind Atlas}},
  year = {2026},
  url = {https://www.isofind.tech/isotopes/en/deposits/hochgrossen/},
  note = {Accessed 2026-10-20}
}

Updated : 2026-10-20