摘要
凡口铅锌矿床具明显的沉积成岩成矿和热液改造成矿特征。区内矿源层富含有机质和有利的地质环境,是成矿元素活化迁移并长距离搬运储集的有利条件。地球化学还原障的建立,是成矿元素富集就位的决定性因素。菱铁矿的形成与H_2障有关;铅、锌等硫化物的就位主要与H_2S障或H_2障的配合作用有关。受隔水层阻挡、富含有机质的不纯碳酸盐岩与断裂构造的复合部位,最有利于形成地球化学障,是寻找富矿的有利地段。
The Fankou Pb-Zn deposit is characterized obviously by its sedimentary diagenetic-metallogenesis and hydrothermal-reformation features. Organic substance riching. source bed in the mining area and its bene- ficial geological setting are the favou able conditions for the activity, migration, long-distance transpor- tation and deposition of metallogenetic elements. The establishment of reducing barrier is a decisive factor for the enrichment and emplacement of the metallogentic elements. The formation of siderite is related to the H_2 barrier, while the emplacement of lead and zinc sulfides bears a relation mainly to H.S barrier or the combined action of H_2S and H_2 barriers. The composite location of the impure carbonate (being rich in organic substance and blocked by the water-resisting layer) and fracture stiucture is most favourable for the formation of the barrier and is also an ideal target for rich ore searching.
出处
《地质与勘探》
CAS
CSCD
北大核心
1989年第8期9-16,共8页
Geology and Exploration
