Multicomponent Ore Mineralization in Ultrabasites of the Ospa-Kitoy Massif of the East Sayan Ophiolite Belt: Formational Parageneses and Origin (Diamond, Nephrite, Noble Metals, Chromium, Nickel)  

作　　者：Alexander Vasilyevich Tatarinov Lyubov Ilyinichna Yalovik Alexander Vasilyevich Tatarinov;Lyubov Ilyinichna Yalovik(Geological Institute, Siberian Branch, Russian Academy of Sciences, Ulan-Ude, Russia)

机构地区：[1]Geological Institute, Siberian Branch, Russian Academy of Sciences, Ulan-Ude, Russia

出　　处：《Geomaterials》2021年第4期69-95,共27页地质材料（英文）

摘　　要：It is shown that on a small (200 km²) massif area two extensive groups of metallic (Cr, Ni, Cu, Au, Ag, Pt, Pd, Ru, Os, Ir) and non-metallic (diamond, nephrite, jewelry and ornamental rodingites, chrysolite) types of minerals are spatially and genetically combined. They are grouped into 4 ore-forming types of polycomponent ores: diamond-gold-platinum-metal, chromium-nickel-platinum-metal, gold-platinum-metal and chrysolite-nephrite-rodingite. Ore-formational types form a minerogenic series—the product of a single ore-forming system. The paragenetic kinship between diamonds, chrysolite, nephrite, chromite and noble metals has been established. There are main genetic characteristics that ensure the formation uniqueness of the ore-forming system: 1) chariage-thrust control of ore mineralization and multilevel dynamometamorphic ore genesis with a mechanochemical mechanism of mineral formation. Ore-controlling thrusts are structures of shallow dipping that do not cover the entire lithosphere, but only a section of the earth’s crust;2) carbon fluid, mainly of carbonyl form, which has subjected all types of the ophiolite complex rocks of the Ospa-Kitoy node to intensive transformation, has a crustal mechanochemical, not mantle origin;3) a strong paragenetic (“hybrid”) petrological-mineral-geochemical relation occurring between minerals groups of metallic and non-metallic types is a consequence of the participation in the ore genesis processes of a large variety in different material composition of rocks petrotypes, representing a section of the Earth’s crust in the considered part of the East Sayan ophiolite belt.It is shown that on a small (200 km²) massif area two extensive groups of metallic (Cr, Ni, Cu, Au, Ag, Pt, Pd, Ru, Os, Ir) and non-metallic (diamond, nephrite, jewelry and ornamental rodingites, chrysolite) types of minerals are spatially and genetically combined. They are grouped into 4 ore-forming types of polycomponent ores: diamond-gold-platinum-metal, chromium-nickel-platinum-metal, gold-platinum-metal and chrysolite-nephrite-rodingite. Ore-formational types form a minerogenic series—the product of a single ore-forming system. The paragenetic kinship between diamonds, chrysolite, nephrite, chromite and noble metals has been established. There are main genetic characteristics that ensure the formation uniqueness of the ore-forming system: 1) chariage-thrust control of ore mineralization and multilevel dynamometamorphic ore genesis with a mechanochemical mechanism of mineral formation. Ore-controlling thrusts are structures of shallow dipping that do not cover the entire lithosphere, but only a section of the earth’s crust;2) carbon fluid, mainly of carbonyl form, which has subjected all types of the ophiolite complex rocks of the Ospa-Kitoy node to intensive transformation, has a crustal mechanochemical, not mantle origin;3) a strong paragenetic (“hybrid”) petrological-mineral-geochemical relation occurring between minerals groups of metallic and non-metallic types is a consequence of the participation in the ore genesis processes of a large variety in different material composition of rocks petrotypes, representing a section of the Earth’s crust in the considered part of the East Sayan ophiolite belt.

关 键 词：Ultrabasites OPHIOLITES DIAMOND Platinoids NEPHRITE 

分 类 号：P58[天文地球—岩石学]