香花岭锡多金属矿田成矿地质条件及矿床成因探讨

在研究香花岭锡多金属矿田内地质构造、赋矿地层及含锡花岗岩发育特征及其控矿作用后、认为赋矿地层具有成矿物质初始富集特征:花岗岩属于具高难度、适度富碱、贫钙镁铁.富合面矿元素和挥发组分、高度分异演化的陆壳重熔花岗岩、成矿性良好.总结了区内主要类型的锡多金属矿床基本地质特征,重点阐述了本区新发现的斑岩锡矿床地质特征.根据矿化富集与地层和花岗岩体的时空关系,锡石矿物地球化学特征,矿床稀土地球化学特征,矿物包裹体成分统计分析等最新研究成果,提出了锡多金属矿床的地层—花岗岩的“双控”成因.

THE METALLOGENIC GEOLOGICAL SETTING AND APPROACH ON ORE GENESIS OF XIANG HUALING TIN-POLYM ETALLIC ORE FIELD

Through the study of structure, ore-hearing strata, character of tin-bearing granite development and its ore-controlling process, it is considered that ore-bearing strata bear the initial enrichment characteristics of ore forming material, and that the granite belongs to higher acidity, moderate rich in alkali, poor in calcium, iron and magnesium, rich in ore-forming elements and volatile component- highly differentiated evolution continental crust rcmelting one and was a favourable ore-forming granitic body, The basical geological features of major type tin-polymetallic deposit in the district was summarized and the geological character of new diseovery porphyritic tin deposit was emphatically expounded, Based on the recently research results on the relationship in time and space of mineralization enrichment between strata and granitic body, geochemieal feature of cassiteritc mineral, geochemical feature of rare earth element in the deposit, statistical analysis of the composition of minerals inclusion, it is suggested that Xianghualing tin-polymetallic deposit is of the strata and granitic rock co-controlling genesis.