Magnesian-Magnetite Ore Formation
B.M. Strunin, O.A. Duzhikov, A.K. Mkrtychyan, 1988. "Magnesian-Magnetite Ore Formation", Geology and Metallogeny of Sulfide Deposits Noril’sk Region U.S.S.R., O.A. Duzhikov, V.V. Distler, B. M. Strunin, A. K. Mkrtychyan, M.L. Sherman, S.S. Sluzhenikin, A.M. Lurye
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Iron mineralization is widely developed within the Angaro-Vilujsky ore belt . In the Noril’sk region, it is found along the western border of the Tungussky syncline and also within the Noril’sk-Kharayelakh depression. The Angaro-Noril’sk metallogenic zone contains some iron mineralization (as deined by N. V. Pavlov ). This metallogenic zone is controlled by the Imangdinsky-Letninsky fault zone and is best developed in the basin of the Letnyaya, Severnaya and Kurejka rivers.
Iron-bearing deposits of the Angaro-Vilujsky belt are localized within an area of volcano-tectonic structures which is 60 x 130 kilometers in extent. These deposits occur as shallow domes and basins within Paleozoic to early Mesozoic rocks; at the margins they are rimmed by multiple fractures, crush zones and associated hydrothermal alteration, by arcuate trap dykes and diatremes. The circularity of the structures is reflected in the magnetic fields, which are characterized by a simple pattern in the central part and by a complicated pattern at the periphery. They are connected with crustal magmatic chambers, which are believed to be 8 to 15 kilometers deep. The roots of the deposits are connected with the evolving intermediate chambers, which are probably very extensive vertically and interconnect with a mantle source. These considerations are based on geological data and on K-Ar dating of the volcanic pipes (220+/-25 million years) and the magnesian-magnetite hydrothermal mineralization (160 to 100 million years). The deposits formed as a result of the interaction between basaltic magma in the intermediate chamber and mantle fluid; this led to
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The Noril’sk volume is a valuable contribution to the economic geology profession. The translation which is a very literal one from the Russian original, has been ‘donated’ to the Society of Economic Geologists by Falconbridge and Inco. This is the first special publication for the Society. We have two successful series, Reviews in Economic Geology and our Guidebook series. When we were offered this translation we initiated this special publication series. It is hoped that we will continue to pursue and publish other monographs of direct economic interest for our members and the economic geology community at large.
This volume and the accompanying figures (maps), tables and plates presents an excellent overview of the Noril’sk area and the mineralization specific to this region. Considerable awareness of the Noril’sk area has been available through various translations of Russian literature and ever increasing opportunities for western world geoscientists to visit the region. The Society is proud to have this opportunity to provide this comprehensive volume to economic geoscientists.
Many individuals contributed their time, expertise and support. We would like to acknowledge A.J. Naldrett for his efforts in obtaining this translation from Inco and Falconbridge on our behalf. He was also our liaison with the original authors and was very supportive throughout the editing process. Falconbridge initiated the translation and G. Rylkova was contracted to produce a literal translation and we chose to substitute, or identify, a few nonfamiliar Russian terms with equivalent English language terms. However, the substance of the translation has not been changed. The editing concentrated on consistency, accuracy and limited grammatical re-interpretation. A location map and a stratigraphic section were added to the introduction. Suggestions for editing consistency were gratefully received from A. Craigie and R. Horn.
Additional support for production and distribution was received from T. Thompson, J. Robertson, K. Clark.
All figures, tables and plates were redrafted with their interpreted legends by Inco. W. Saftic and W. Peredery provided additional suggestions for drafting format and continuity. Inco and Falconbridge shared all drafting costs and donated this service to the Society of Economic Geologists as well as the translated text. P. Lightfoot gave permission to include the location map and the stratigraphic section in the introduction.
The cover design was produced by C. Podashinsky and the WP formatting was contracted to Keystrokes Business Support Services. Production and printing of the volume was contracted to Citizen Printing Co. Inc. of Fort Collins.