Abstract—The paper presents the results of mineralogical studies of tin–silver–polymetallic ores localized at the deep level (500–700 m below the surface) of the Yuzhnoe Cenomanian deposit. On the deep southwestern flank of vein no. 4, indications of ore recrystallization have been revealed. Mineral segregations (inclusions) with sharp boundaries and myrmekite texture as fine intergrowths of pyrrhotite with nisbite (NiSb₂) or breithauptite (NiSb) are found in recrystallized ores at the grain boundaries of nickel-bearing pyrrhotite and galena with abundantly disseminated Ag–Sb minerals. Less frequently, myrmekite-like segregations are pyrrhotite graphically intergrown with gudmundite or nonstoichiometric chemically variable Ag sulfoantimonide (phase X). Tiny grains of Ag-bearing chalcopyrite and stannite are frequently observed in pyrrhotite–sulfoantimonide intergrowths. The formation of myrmekite-like segregations is presumably associated with ore transformation in the fluid-thermal field of a Maastrichtian postore leucogranite intrusion. Local segregations of the mobilizate (mobile phase) formed as a metal-bearing sulfoantimonide melt during ore recrystallization at a temperature of ~600°C as a result of the redistribution and migration of trace elements to the contacts of mineral grains. Heterogenous distribution and variable chemical composition of micrographic segregations reflect immiscibility and differentiation of the formed metal-bearing sulfoantimonide melt during its liquidus evolution. The final avalanche-like quenching crystallization of melt inclusions was implemented below 300°C.

摘要— 本文介绍了位于 Yuzhnoe Cenomanian 矿床深层（地表以下 500-700 m）的锡银多金属矿的矿物学研究结果。在深静脉的西南侧没有。4、矿石重结晶迹象已显现。矿物偏析（夹杂物）具有清晰的边界和 myrmekite 纹理作为磁黄铁矿与镍铁矿（NiSb ₂) 或 breithauptite (NiSb) 存在于含镍磁黄铁矿和方铅矿晶界处的再结晶矿石中，并含有大量浸染的 Ag-Sb 矿物。不太常见的是，类myrmekite 偏析是磁黄铁矿与gudmundite 或非化学计量化学变化的Ag 磺基锑化物（X 相）图形共生。在磁黄铁矿-磺基锑化物共生体中经常观察到微小的含银黄铜矿和锡矿晶粒。似豆蔻石偏析的形成可能与马斯特里赫特矿后淡色花岗岩侵入体的流体-热场中的矿石转化有关。由于微量元素重新分布和迁移到矿物颗粒的接触点，在约 600°C 温度下的矿石重结晶过程中，作为含金属磺基锑化物熔体形成的动员物（流动相）的局部偏析。显微偏析的不均匀分布和可变化学成分反映了形成的含金属磺基锑化物熔体在液相线演化过程中的不混溶性和分化性。熔体夹杂物的最终雪崩状淬火结晶在 300°C 以下进行。