MIGRATION CHARACTERISTICS OF ORE-FORMING ELEMENTS DURING MINERALIZATION AND ALTERATION OF TONGCHANGGOU PORPHYRY COPPER-MOLYBDENUM DEPOSIT, YUNNAN PROVINCE
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摘要: 铜厂沟斑岩型铜钼矿是格咱岛弧燕山晚期Mo多金属成矿作用的典型代表，矿床中与Cu-Mo矿化相关的蚀变作用广泛发育。文章在对该矿床岩相学研究的基础上，选择TiO2作为蚀变过程中惰性组分、运用Gresens方程对元素迁移进行定量分析。主量元素迁移特征显示在钾硅酸盐化蚀变阶段和石英—绢云母化蚀变阶段中Al2O3、K2O、Na2O、P2O5、SiO2持续迁入，青磐岩化阶段Fe2O3、MgO、CaO迁入富集；微量元素在钾硅酸盐化阶段显示为Mo、Ba、W、Ra、Nb、Ta、LREE元素明显迁入，且Ba、W与Mo的富集有明显的相关性，石英—绢云母化蚀变阶段Pb、Zn富集成矿，青磐岩化阶段Cu富集成矿，铜厂沟斑岩型铜钼矿矿化蚀变与成矿元素迁移特征研究对该区深部地球化学勘查指标制定、成矿信息及矿体边界确定等具有重要的参考意义。Abstract: The porphyry Cu-Mo molybdenum ore deposit is a typical example of Mo polymetallic mineralization of Geza arc in the late Yanshan period. Based on the petrographic study of this deposit, TiO2 was selected as the inert component in the process of alteration and the element migration was quantitatively analyzed by using Gresens equation. The migration characteristics of major elements show that Al2O3, K2O, Na2O, P2O5 and SiO2 continue to immigrate in the potassium silicate alteration stage and the sericitization stage of quartz stage, and that Fe2O3, MgO and CaO immigrate in the prophylitic stage. Trace elements showed significant migration of Mo, Ba, W, Ra, Nb, Ta and LREE in the potassium silicate salinization stage, and the enrichment of Ba, W and Mo was significantly correlated. Pb and Zn were enriched in quartz-sericite alteration stage, while Cu was enriched in prophylitic stage. The study on mineralization alteration and migration characteristics of ore-forming elements in Tongchanggou porphyry copper-molybdenum ore deposit has important reference significance for the establishment of deep geochemical exploration index, metallogenic information and determination of ore-body boundary in this area.
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图 1 格咱岛弧区域地质图(据文献[7]修改)
1—第四纪全新世堆积层; 2—上三叠统图姆沟组; 3—上三叠统松桂组; 4—上三叠统中窝组; 5—三叠系泥汝组; 6—中三叠统北衙组; 7—下三叠统青天堡组; 8—二叠系冈达概组; 9—二叠系峨眉山组; 10—上二叠统黑泥哨组; 11—下二叠统冰峰组; 12—黑云花岗岩; 13—超基性岩脉; 14—辉长辉绿岩脉; 15—铜钼矿点; 16—金矿点; 17—铅锌矿点; 18—地质界线; 19—断裂; 20—分区断裂; 21—研究区
Figure 1. Geological map of the Geza arc (after reference[7])
图 2 铜厂沟铜钼矿蚀变矿化过程主量元素迁移图
Figure 2. Migration diagram of major elements during alteration and mineralization of Cu-Mo ore
图 3 铜厂沟铜钼矿蚀变矿化过程微量元素迁移图
Figure 3. Migration diagram of trace elements during alteration and mineralization of Cu-Mo ore
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