摘要
本文以偃龙铝土矿为对象,研究了铝土矿的地球化学特征,讨论了其成矿物质来源。铝土矿含矿岩系中不同矿产的SiO_2、Al_2O_3、Fe_2O_3、FeO的元素含量变化较大,且总量较高,说明铝土矿在形成过程中,其源岩风化程度较高。Al_2O_3与SiO_2、Fe_2O_3、K_2O含量呈负相关关系,与TiO_2、A/S呈正相关关系。含矿岩系明显具有富集轻稀土、亏损HREE的特征,在垂向上,其稀土元素含量较高的是Ce、La、Nd(均为轻稀土),低含量的是Tm、Ho、Eu、Lu。微量元素方面,偃龙铝土矿比山西铝土矿富集的元素有Li、Be、Sc、Ni、Cu、Zn、Zr等稀有金属元素和亲铜元素,而这些元素在贵州大竹园铝土矿中的含量比偃龙铝土矿更富集。偃龙铝土矿的成矿物质来源于基底碳酸盐岩风化残余,在广泛海侵时,残余物质经搬运沉积成矿。
Taking the Yanlong deposit in Henan Province as the target, this work studied the geochemical characteristics and ore -forming material sources of this bauxite deposit. The results show that the element content of SiO2 , A1203 , Fe203 , and FeO is highly variable, and the total amount is large, which means the weathering degree of provenance rocks was strong during the formation of ore - bearing rock series. The content of Al2O3 has a neg- ative relationship with SiO2, Fe2O3 and K2O, and a positive relationship with TiO2 and A/S. The elements LREE, Ce, La, and Nd are enriched and Tin, Ho, Eu, Lu are depleted, while the content of Li, Be, Se, Ni, Cu, Zn, Zr in the Yanlong deposit is higher than that in deposits of Shanxi, but lower compared to the Dazhuyuan bauxite deposit in Guizhou Province. Meanwhile, the ore - forming materials of the Yanlong bauxite deposite were origi- nated from weathered residuals of basement carbonate rocks, which were transported and deposited to result in mineralization during extensive transgres- sion.
出处
《地质与勘探》
CAS
CSCD
北大核心
2017年第4期704-714,共11页
Geology and Exploration
基金
河南省地质勘查基金项目(豫国土资发[2014]3号
编号3)资助
关键词
铝土矿
地球化学
物质来源
偃龙
河南省
bauxite, geochemistry, ore - forming material source, Yanlong, Henan Province
