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Peter C. Lightfoot, Igor A. Zotov. Geological Relationships Between the Intrusions, Country Rocks, and Ni-Cu-PGE Sulfides of the Kharaelakh Intrusion, Noril’sk Region：Implications for the Roles of Sulfide Differentiation and Metasomatism in Their Genesis[J]. Northwestern Geology, 2014, 47(1): 1-35.
Citation: Peter C. Lightfoot, Igor A. Zotov. Geological Relationships Between the Intrusions, Country Rocks, and Ni-Cu-PGE Sulfides of the Kharaelakh Intrusion, Noril’sk Region：Implications for the Roles of Sulfide Differentiation and Metasomatism in Their Genesis[J]. Northwestern Geology, 2014, 47(1): 1-35.
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Geological Relationships Between the Intrusions, Country Rocks, and Ni-Cu-PGE Sulfides of the Kharaelakh Intrusion, Noril’sk Region：Implications for the Roles of Sulfide Differentiation and Metasomatism in Their Genesis

  • 1. Department of Earth Sciences, Laurentian University, 925 Ramsey Lake Road, Sudbury, ON P3E 2C6, Canada;

  • 2. Institute of Ore Deposit Geology, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences Stacomonetnyi pec.35, Moscow 1Ф9Ф17, Russia

Funds: 

Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits，MLR

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  • Author Bio:

    Peter C. Lightfoot: Peter C. lightfoot，male. E-mail：PLightfoot@laurentian.ca

  • Received Date: January 01, 2014
  • Revised Date: February 28, 2014
  • Available Online: July 28, 2022
  • Published Date: March 04, 2014
    Graphical Abstract
    • Abstract
  • The Ni-Cu-platinum group element sulfide ore deposits of the Kharaelakh Intrusion,Noril'sk Region,Siberia,represent a large concentration of sulfides associated with a small differentiated intrusion formed at the edge of the Siberian Craton in the roots of the Siberian Trap flood basalt. The deposit is associated with an intrusion that occupies a flanking periclinal structure adjacent to the Noril'sk-Kharaelakh Fault. The intrusion is strongly differentiated and comprises taxitic gabbrodolerites,picritic gabbrodolerites,and gabbrodolerites within the main body which in turn forms a chonolith within a sheet-like intrusion that extends laterally to form extensive undifferentiated sills of gabbrodolerite. The intrusion substantially replaces the stratigraphy of the country rocks,and although it appears to have exploited the axis of structures developed in response to transtension,the intrusion has created space by both mechanical dilation of stratigraphy and magmatic replacement of pre-existing sedimentary rocks. The frontal lobes of the main intrusion have complex apophyses of gabrodolerite on a range of scales that demonstrate replacement of the sedimentary rocks and link to the development of an extensive metamorphic halo in the country rocks. This halo is much narrower over the main body of the intrusion,and these observations have implications for the thermal history of the intrusion. Mg-skarns and breccias are developed in the roof of the main body of the intrusion. Within the intrusion,the taxitic rocks contain vesicles and the blebby sulfides developed in the picritic and taxitic gabbrodolerites appear to have a linkage to volatile phases. Cuprous sulfide mineralization developed at the roof of the Kharaelakh Intrusion is associated with metamorphosed and skarn-bearing country rocks,and appears to have been generated by a combination of sulfide fractionation and associated metasomatism. The geological relationships appear consistent with a chonolith model for the development of the differentiated intrusion and mineralization,but the extent of metasmorphism of the country rocks appears to be related to the unusual thickness of gabbrodolerite apophyses at the flanks of the intrusion rather than metamorphism produced by the passage of mafic magma through the intrusion. Variations in disseminated sulfide compositions and metasomatic textures in the skarns are described,and a model is proposed which balances traditional views on the evolution of the magma conduits with the impact of magmatic fluids transported through the magma column （i.e. transmagmatic fluids）. The importance of structures in controlling the nature of the conduit,and the resultant small intrusions with excess sulfide is a feature of many other Ni-Cu sulfide deposits including Voisey's Bay,and it is suggested that the sulfides are more likely to have been transported from depth into their final resting place rather than developed by in-situ equilibration of sulfide with fresh magma in the chonolith.
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    • References (61)
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