Quantitative assessment of the relative roles of sulfide liquid collection, magmatic degassing and fluid-mediated concentration of PGE in low-sulfide ores of the Norilsk intrusions

Gritsenko, Yulia D.; Kondrikova, Alexandra P.; Gilbricht, Sabine; Schoneveld, Louise; Barnes, Stephen J.; Godel, Bélinda; Sluzhenikin, Sergey F.; Petrenko, D. B.; Seifert, Thomas; Yudovskaya, Marina A.

doi:10.1016/j.oregeorev.2022.105042

Cited by 7 publications

(1 citation statement)

References 68 publications

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“…The Talnakh deposit (together with the Oktyabr’sky deposit) is characterized by a huge mineralogical diversity compared to other magmatic deposits. The predominant number of modern publications are devoted to platinum group minerals 6 , 10 , 11 . Other groups of mineral species have been studied to a much lesser extent 12 .…”

Section: Introductionmentioning

confidence: 99%

The first identification of cronstedtite in Cu–Ni–PGE ores of the Talnakh intrusion

Yakich,

Zhimuleva,

Rudmin

et al. 2023

Sci Rep

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We present new mineralogical data of cronstedtite from the Southern-2 orebody, located in the South-Western branch of the Talnakh intrusion (Noril’sk area) composed of massive sulfides in which the total amount of oxides and silicates does not exceed 1–3 vol%. The petrographic and mineralogical features of these ores indicated occurrence of fine-grained, fibrous needle like clusters < 50-µm-sized grains of cronstedtite (7.09 Å along its c-axis). This mineral confirmed by a number of analytical techniques (powder X-ray diffraction of balk samples, transmission electron microscopy, scanning electron microscopy, Raman and Infrared spectroscopy). Cronstedtite sporadically contains signals of Al, Ni, Ca and filling the cracks and cavities between sulfides of copper (chalcopyrite) and iron (pyrrhotite, pentlandite). In some cases, cronstedtite contains micron-sized PGM, and associates with magnetite. According the X-ray diffraction analysis of the bulk massive ores besides cronstendtite are established kaolinite, gypsum, calcite, quartz, and cristobalite. The findings of cronstedtite in Noril’sk area have never been mentioned publicly before. Its occurrence is the northernmost known locality in the world. Our results imply that the formation of cronstedtite in the Talnakh intrusion could be possible by the active participation low-temperatures fluids within the relatively near-surface (< 2 km of paleosurface) conditions of intrusion emplacement, in contrast to other deep-seated supergiant Cu–Ni–PGE deposits in the world. The conditions of formation in isolated cavities in fresh pyrrhotite-pentlandite-chalcopyrite massive ores of deep level of the Talnakh intrusion could be favorable for the formation of cronstendtite.

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