Institute of Geology of Diamond and Precious Metals. Siberian Branch, Russian Academy of Sciences, Yakutsk, Russia:

V. Yu. Fridovsky, Director, Doctor of Geologo-Mineralogical Sciences, 710933@list.ru

Institute of Geology of Ore Fields, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences, Moscow, Russia:
G. N. Gamyanin, Leading Researcher, Doctor of Geologo-Mineralogical Sciences

Ammosov North-Eastern Federal University, Yakutsk, Russia:

L. I. Polufuntikova, Head of a Chair, Candidate of Geologo-Mineralogical Sciences

It has been found that the Late Mesozoic metallogeny and the geodynamic events in the east margin of North Asian Craton are interrelated. Gold-and-quartz deposits of shear zones are associated with the beginning of frontal accretion between Okhotsk terrain and the east margin of North Asian Craton, accompanied by nucleation of granite–metamorphic domes and generation of metamorphogene hydrothermal fluids. During accretion of the Okhotsk terrain and the east margin of North Asian Craton, orogenic ore–magmatic systems developed, hypabyssal and intermediate magmatic pockets formed as well as gold-and-quartz and gold-andbismuth deposits appeared. According to isotope–geochemical data, origination of gold-and-quartz deposits in faulting zones and gold-and-bismuth deposits is connected with the activity of uniform gold ore–magmatic systems. Post-accretion deposits of Ag-Pb-Zn-, Ag-Pb-Sn-, Ag-Au- and Au-Hg represent metallogeny of the external zone of the Albian–Late Cretaceous Okhotsk–Chukotka volcanic and plutonic belt. The observed metallogenic zonal distribution of post-accretion mineralization is related with the distance to the zone of subduction of the Okhotsk–Chukotka Belt. In the east-westward direction off the zone, Au-Ag and Ag-Pb-Sn (Ag-Pb-Zn) are replaced by Au-Hg. It is shown that accretion of terrigene coal formations in the South Verkhoyanie took place is different facial environments and varied oxidation–reduction conditions. The variation in the values of the ratios V/(V+Ni), Cu/Zn, Ni/Co, V/Cr, Mo/Mn is an evidence of the unstable conditions of formation of the deposits, and is reflective of the change of the oxide environment into the dioxide and anoxide environments, which promoted extensive development of authigenic mineralization and impregnation of terrigene formations with ore constituents. From the studies of lead isotopism, lead in gold-and-quarts deposits in shear zones (Au-Q1) comes from the crust and is sourced from deeper level in case of solver–lead–tin deposits (Ag-Pb-Sn). This implies an increase in the levels of generation of fluid–magmatic systems in the Late Mesozoic Age when accretion processes were replaced by post-accretion geodynamic events in the east margin of North Asian Craton.

The studies have been supported by the Russian Science Foundation, Project No. 14-17-00465, R&D Plan of the Institute of Geology of Diamond and Precious Metals, Siberian Branch, Russian Academy of Sciences, Project No. 0381-2014-0008, and partly by the Russian Foundation of Basic Research–Far East, Project No. 15-45-05094 r_vostok_a.

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