Permian-Triassic Intrusions of the South Norilsk trough, Siberian Traps Province: Mineralogy and Geochemistry | Chapter 5 | Modern Advances in Geography, Environment and Earth Sciences Vol. 5

 The Norilsk ore region is part of the Siberian traps province, which contains the PGE-Cu-Ni deposits, which are made up of volcanic and intrusive rocks. Many distinct intrusions, some with associated mineralization, can be found in the Turumakit area, which is located inside the southern Norilsk trough. Within the Turumakit area, we researched magmatic rocks (83 samples). The Norilsk, Ergalakh, Daldykan, and Ogonersky intrusive complexes are thought to be responsible. The baddeleyites' U-Pb system, as well as the derived mineralogical and geochemical data, There is a distinction between the Turumakit area's sub-alkaline rocks and the typical Eragalakh trachydolerites found at the Norilsk and Talnakh ore junctions. In contrast to the normally fine-grained Ergalakh trachydolerites, the Turumakit subalkaline rocks are coarse-grained, with pegmatite gabbro segregations. They also have a greater TiO2 content (up to 4.7 wt%) than ordinary Ergalakh rocks (2.2-3.3 wt%). The Turumakit sub-alkaline rocks have low U, lower La/Yb, and lower La/Sm ratios (5-7 versus 8-10 for and 2.5-2.6 compared 3.0-3.3 for the Ergalakh dolerites). The age of the mafic rocks conventionally linked to the Ergalakh intrusion inside the Turumakit area was estimated using U-Pb methods on baddeleyite and zircon (244.82.7 Ma), and it looks likely that they are younger than the Norilsk intrusions (2501.4 Ma). These findings clearly suggest that the Turumakit intrusions formed at the end of the Norilsk district's magmatic history. The Norilsk district's sub-alkaline magmas are thought to have intruded during two separate magmatic episodes.

Author (s) Details

Nadezhda Krivolutskaya
Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Kosygin St.19, 119991 Moscow, Russia.

Boris Belyatsky
A. P. Karpinsky Russian Geological Research Institute, Sredny Prospect, 74, 199106 St. Petersburg, Russia.

Elena Sereda
A. P. Karpinsky Russian Geological Research Institute, Sredny Prospect, 74, 199106 St. Petersburg, Russia.

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