瓮安杉树坳铝土矿地质及地球化学特征研究

Study on Geological and Geochemical Characteristics of Shanshuao Bauxite Deposit in Wengan

铝土矿是贵州省的优势矿种之一,但黔南地区铝土矿研究相对薄弱。本文以瓮安杉树坳铝土矿为研究对象,展开了地质特征及地球化学特征等方面的系统研究工作。结果发现:Li、Sc、Ga含量最高依次在铝土岩、碎屑状铝土矿、炭质泥岩和劣质煤层中,最低均为含黄铁矿或硫铁矿的粘土岩。同时,对“三稀”元素和主量元素之间的关系进行研究,得知Al 2O 3、TiO 2及Sc整体具有相似的变化规律,而SiO 2、Fe 2O 3、Li及Ga,局部具有相似的变化特征。随着铝含量的增加,碎屑状铝土矿中Al 2O 3、TiO 2、Sc具有相似的变化特征,演变至土状-半土状铝土矿中Al 2O 3、TiO 2、Ga具有相似的变化特征的现象。

Bauxite is one of the dominant mineral in Guizhou province,but studies in South Guizhou bauxite is relatively weak.In this paper,ShanShuAo bauxite of Weng’an is chosen for the study object,started systematic research work of geological features and geochemistry.The results showed that the contents of Li,Sc and Ga were highest in bauxite,clastic bauxite,carbonaceous mudstone and low-quality coal seam,and the lowest were all clay rocks containing pyrite or pyrite.Meanwhile,the relationship between rare earth elements,rare and rare elements and major elements is studied.It is known that Al 2O 3,TiO 2 and Sc have similar laws of variation as a whole,while SiO 2,Fe 2O 3,Li and Ga have similar variation characteristics.With the increase of aluminum content,Al 2O 3,TiO 2 and Sc in the debris bauxite have similar change characteristics,and have evolved to the phenomenon of Al 2O 3,TiO 2 and Ga with similar change characteristics in the soil-semi-earth bauxite.