包心构造是铝土矿床的成因标志

铝土矿床的包心构造,即粘土岩层包裹铝土矿体,是腐植酸长期分解土壤硅酸盐,而导致土壤剖面的垂直分层。具备垂直渗水系统的地形,如岩溶洼地、平顶山丘,是成矿的先决条件之一。铝岩系是一套陆相地层,夹在地层剖面的基底岩层风化侵蚀面之上,和其上发育植被的沉积间断面之下。铝土矿是陆上成矿,是植物化学风化残积矿床。

ENVELOPE STRUCTURE-A GENETIC CRITERIA OF BAUXITE DEPOSITS

Envelope structure in bauxite deposit, that is bauxite ore body being enveloped by clayish layers , is the results of vertical layering in soil section resulted from the long -time decomposition of silicate in soil by hu-mic acid. The landscape with developing vertical seepage system such as karst depression, tafelberg, is one of the prerequisites for mineralization. The host rock is a set of continental strata, intercalated between the lower eroded surface of basement strata in stratigraphic section and the upper sedimentary discontinuty where the the plants were well developed. The bauxite belongs to the genesis of continental mineralization and is batanogeochemical weathering eluvial ore deposits.