黔北务川丰乐铝土矿床地质特征及沉积环境探讨

Geological characteristics and sedimentary environment of Fengle Bauxite deposit in Wuchuan of Northern Guizhou

丰乐铝土矿床位于黔北务正道铝土矿成矿带的南东端,是近年在铝土矿勘查的空白区新探明的中型矿床。勘查发现矿床中含矿岩系顶部拥有不含或偶含炭质岩系的地质特征,与务正道地区其它铝土矿床存在差异性。微量元素Cr/Ni判别显示了含矿岩系的多物源性,V/Zr及Sr/B揭示该区具有海相―陆相或过渡相―海相的沉积特征。结合前人研究成果综合分析认为,该区沉积环境为受海侵影响的近滨海湖泊―沼泽相环境。

Fengle bauxite deposit is located at the southeast end of Wuchuan-Zhengan-Daozhen bauxite metallogenic belt in Northern Guizhou,and it is a medium-sized deposit which is newly discovered in the exploration blank area of bauxite in recent years.The exploration works reveal that the top of ore-bearing rock series has no or little carbonaceous rock series,and this is different from other bauxite deposits in WuchuanZhengan-Daozhen area.Discrimination of microelements Cr and Ni indicates that the ore-bearing rock series has multiple source.According to the results of V/Zr and Sr/B discrimination,this area has marine-continental or transition-marine sedimentary characteristics.In consideration of the previous works of predecessors,it appears that the sedimentary environment of this area is a near coastal lake-swamp facies environment which is affected by transgression of sea..