Far East Geological Institute, Far East Branch, Russian Academy of Sciences, Vladivostok, Russia:

V. T. Kazachenko, Head of a Laboratory, Doctor of Geologo-Mineralogical Sciences, vkazachenko@mail.ru
E. V. Perevoznikova, Senior Researcher, Candidate of Geologo-Mineralogical Sciences
S. N. Lavrik, Senior Researcher, Candidate of Geologo-Mineralogical Sciences

In skarn, Triassic maculose metallogenic sediments and skarn and lode deposits at Sikhote-Alin, geochemical and isotope signatures of gabbroide rocks belonging to Sergeev, Kalinov and Vladimir-Aleksandrov Massifs are traced. Gabbroide rocks of these massifs have a uniform mantle source of magmatic material and are formed as a result of interaction between plume and sedimentary rocks of oceanic crust, presumably, at the bottom of island arc or oceanic plateau. At the least from the mid-Devonian period, these structures laid as two chains of islands at the edge of the Khankai Massif. The Triassic maculose metallogenic sediments and skarn and lode deposits at Sikhote-Alin initially were erosion products of laterite residuum of basic and ultra-basic island rocks accumulating in lagoons (in the modern form – skarns) and in adjacent water areas of the islands (maculose metallogenic sediments). They feature high content of a variety of Au, Ag, Pt and Pd (native minerals, intermetal compounds of these metals, copper gold, nickel gold, porpezite, uytenbogaardtite, sperrylite, pyrargyrite, Ag-fahlore, Ag sulphide, aguilarite and other) and are appealing in a practical sense. Lead from skarn and lode deposits of Sikhote-Alin have isotopic ratios comparable with Pb gabbroides from Sergeev, Kalinov and Vladimir-Aleksandrov Massifs, which were its sources. The genetic features of skarn and lode deposits of Sikhote-Alin favorably influenced mine-technical characteristics of ore bodies and process properties of ore. They conditioned formation of large reserves of Pb, Zn, Ag, Sn, W and B mainly in relatively small areas, in the form of numerous lenticular or blanket like deposits and systems of rich lodes of complex mineralization suitable for mining.
The studies have been supported by the Russian Foundation for Basic Research, Project No. 12-05-00396-а, and by the Presidium of the Russian Academy of Sciences, Project No. 12-I-P27-03.

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