TY - JOUR

T1 - Origin of the pd‐rich pentlandite in the massive sulfide ores of the Talnakh deposit, Norilsk region, Russia

AU - Kalugin, Valery

AU - Gusev, Viktor

AU - Tolstykh, Nadezhda

AU - Lavrenchuk, Andrey

AU - Nigmatulina, Elena

N1 - Funding Information: The studies were carried out within the framework of the state assignment of the Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences and financed by the Ministry of Science and Higher Education of the Russian Federation. Financial assistance was also obtained from the Russian Foundation of Basic Research projects No. 20?35?90088. Publisher Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

PY - 2021/11

Y1 - 2021/11

N2 - Pd‐rich pentlandite (PdPn) along with ore‐forming pentlandite (Pn) occurs in the cubanite and chalcopyrite massive sulfide ores in the EM‐7 well of the Southern‐2 ore body of the Talnakh deposit. PdPn forms groups of small grains and comprises marginal areas in large crystals of Pn. The palladium content in PdPn reaches up to 11.26 wt.%. EDS elemental mapping and a contour map of palladium concentrations indicate distinct variations in the palladium content within and between individual grains. Palladium distribution in the large grains is uneven and non‐zoned. PdPn was formed as the result of a superimposed process, which is not associated with either the sulfide liquid crystallization or the subsolidus transformations of sulfides. Deming regression calculations demonstrated the isomorphic substitution character of Ni by 0.71 Pd and 0.30 Fe (apfu), leading to PdPn occurrence. The replacement of Ni by Fe may also indicate a change in sulfur fugacity, compared to that taking place during the crystallization of the primary Pn. The transformation of Pn into PdPn could have occurred under the influence of a Pd‐bearing fluid, which separated from the crystallizing body of the massive sulfide ores.

AB - Pd‐rich pentlandite (PdPn) along with ore‐forming pentlandite (Pn) occurs in the cubanite and chalcopyrite massive sulfide ores in the EM‐7 well of the Southern‐2 ore body of the Talnakh deposit. PdPn forms groups of small grains and comprises marginal areas in large crystals of Pn. The palladium content in PdPn reaches up to 11.26 wt.%. EDS elemental mapping and a contour map of palladium concentrations indicate distinct variations in the palladium content within and between individual grains. Palladium distribution in the large grains is uneven and non‐zoned. PdPn was formed as the result of a superimposed process, which is not associated with either the sulfide liquid crystallization or the subsolidus transformations of sulfides. Deming regression calculations demonstrated the isomorphic substitution character of Ni by 0.71 Pd and 0.30 Fe (apfu), leading to PdPn occurrence. The replacement of Ni by Fe may also indicate a change in sulfur fugacity, compared to that taking place during the crystallization of the primary Pn. The transformation of Pn into PdPn could have occurred under the influence of a Pd‐bearing fluid, which separated from the crystallizing body of the massive sulfide ores.

KW - Fluid

KW - Massive sulfide ore

KW - Pd‐rich pentlandite

KW - Talnakh deposit

UR - http://www.scopus.com/inward/record.url?scp=85118869183&partnerID=8YFLogxK

U2 - 10.3390/min11111258

DO - 10.3390/min11111258

M3 - Article

AN - SCOPUS:85118869183

VL - 11

JO - Minerals

JF - Minerals

SN - 2075-163X

IS - 11

M1 - 1258

ER -