贵州三都—丹寨地区多金属成矿系列特征及成矿作用

Metallogenic Series Characteristics and Mineralization in Sandu-Danzhai Area in Guizhou Province

三都—丹寨地区是贵州省境内著名的多金属成矿带,该带内发育金、锑、铅、锌等多种金属矿产,其成矿作用颇具特色。为进一步把握三都—丹寨地区多金属成矿作用,对该地区金矿、锑矿、铅锌矿等典型矿产的地质特征进行了分析。结果表明:①矿床严格受SN向构造控制,主要表现为构造直接容矿,表明SN向构造是成矿流体运移的主要通道;②矿床中矿石矿物δ^(34)S值为+5.6‰~+30.8‰,均值为+17.5‰,接近于赋矿地层海相碳酸盐岩,表明海相硫酸盐的还原作用可能为金属硫化物的沉淀提供了S源;③区内矿床赋矿围岩δ^(13)C值为-0.2‰~-4.68‰,δ^(18)O值为+15.49‰~+22.69‰,表明碳酸盐溶解作用在成矿过程中起到了积极的作用,多金属成矿与岩性—构造—流体耦合作用有关。

Sandu-Danzhai area is a well-known polymetallic metallogenic belt in Guizhou Province.Gold,antimony,lead,zinc and other metal minerals are developed in this belt,and its mineralization is quite distinctive.In order to further grasp the polymetallic metallogenesis in Sandu-Danzhai area,the geo⁃logical characteristics of typical minerals such as gold,antimony and lead-zinc deposits in this area is ana⁃lyzed.The results show that:①The ore deposits are strictly controlled by the SN-trending structure,which is mainly characterized by the direct ore-hosting of the structure,indicating that the SN-trending structure is the main channel for the migration of ore-forming fluids.②Theδ^(34)S value of the ore minerals in the deposit varies from+5.6‰to+30.8‰,with an average value of+17.5‰,which is close to the ore-hosting strata marine carbonate rocks,indicating that the reduction of marine sulfate may provide the S source for the pre⁃cipitation of metal sulfides.③Theδ^(13)C value of the ore-hosting surrounding rocks in the area changes from-0.2‰to-4.68‰,and the range ofδ^(18)O value is from+15.49‰to+22.69‰,indicating that carbonate dissolution played an active role in the mineralization process,polymetallic mineralization is related to li⁃thology-structure fluid coupling.