Abstract
Consideration is given to the nature of mafic–ultramafic bodies in the southeastern part of the Aldan-Stanovoi Shield using the Kun-Manie ore field as an example. These bodies played an important role in the formation of the Kun-Manie sulfide copper–nickel deposit as conduits of sulfide-bearing magmas. A detailed mineralogical and geochemical study with interval sampling was carried out on core samples from the drilling of two intrusive bodies, Treugolnik and Iken, using drill holes 21 and 25. The drill–core data present evidence for their origin from a single parent magma. The Treugolnik and Iken minor intrusions were emplaced in magmatic chambers at different depths during the cotectic crystallization of dark minerals from the primary picrite (Treugolnik body) and intermediate picrobasalt (Iken body) magmas. A comparative study of petrogeochemical and mineralogical data suggests that the Treugolnik intrusion formed as a closed system with magma emplaced in a single, relatively rapid injection and crystallized without losses; the Iken sill formed as an open system as a result of magma emplacement in several pulses with time intervals between injections. These magma bodies, together with the host metamorphic rocks, were involved in tectonic deformations after they crystallized.
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ACKNOWLEDGMENTS
The authors are grateful to Dr. A.E. Isokh, Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, and Dr. S.V. Vysotsky, Far East Geologic Institute, Far East Branch of the Russian Academy of Sciences for critically reviewing the manuscript.
Funding
The study was carried out as a State assignment to the Kosygin Institute of Tectonics and Geophysics, Far East Branch of the Russian Academy of Sciences.
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Recommended for publishing by Yu. A. Martynov
Translated by T. Koryakina
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Prikhodko, V.S., Petukhova, L.L., Guryanov, V.A. et al. Petrology of Nickeliferous Mafic–Ultramafic Bodies of the Southeastern Aldan-Stanovoy Shield. Russ. J. of Pac. Geol. 14, 137–155 (2020). https://doi.org/10.1134/S1819714020020074
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DOI: https://doi.org/10.1134/S1819714020020074