河南铝土矿成矿地质特征及深部勘查方向

河南省铝土矿属沉积类型,它产于奥陶(寒武)系碳酸盐岩古风化侵蚀面上,严格受沉积间断面及上石炭系本溪组地层控制,成因较为复杂。铝土矿的形成不仅与成矿物质来源有关,而且受古地理环境和古地貌特征的制约亦十分明显。后期改造和风化淋滤作用使矿石中的Al_2O_3含量相对增高,形成优质铝土矿。通过对成矿地质特征、物质来源、次生富集作用及古地理环境的研究和焦村铝土矿深部地槽区超亿吨特大型铝土矿案例证实,认为河南中、西地区深部具有较好的找矿远景。

Geological characteristics and prospecting target in the depthof Bauxite deposit in Henan

The bauxite deposit in Henan Province belongs to sedimentary type. The deposit was formed on old weathering and erosion surface of carbonate rock of Ordovician (Cambrian) system and is strictly controlled by depositional interface and Benxi group of Carboniferous system. Its genesis is relatively complicated. The formation of bauxite deposit not only relates to the ore-forming material source, also apparently to the palaeo-geographic environment and palaeogeomorphic characteristics. The late stage reformation and weathered leaching process enriched the content of Al₂O₃ in the ore and the high grade bauxite deposit was formed. Based on the integrated study of metallogenic geological conditions, ore-forming material sources, secondary enrichment process and palaeo-geographic environment, it was pointed out that there is great prospecting potential in the central and western parts of Henan Province, which has been verified by the case study in the depth of Jiaocun bauxite deposit which owns more than 100 mt ore tonnage.