摘要
务川瓦厂坪铝土矿床是近年探明的大型矿床,332+333资源量4397万吨。地球化学研究显示,矿床中Al2O3与TiO2含量成正相关关系,与SiO2含量成负相关关系;硫同位素组成属于沉积岩范畴,总体显示出变化范围大(-29.20‰～+12.40‰),反映出复杂的成矿环境和轻重硫同位素的多次分离;不同岩、矿石的稀土总量(ΣREE)含量变化大,LREE/HREE均大于1,显示轻稀土较富集;铝土矿层中,土状铝土矿稀土元素含量相对高,致密块状铝土矿含量相对低,稀土元素含量与矿石质量总体呈正相关关系。铝土矿层及志留系韩家店组的稀土总量含量较接近。矿床成因属古风化壳沉积型。
Wachangping Bauxite deposit is the biggest deposit currently in the area, and has been expIored 43970000 tons of resources （332 ＋333）. Geochemical characteristics show that there is a positive correlation between the contents of Al2O3 and TiO2 , but a negative correlation between the contents of Al2O3 and SiO2 in the bauxite deposits. The composition of sulfur isotopes has sedimentary characteristics with a great variety（ -29. 20‰ ＋ 12. 40‰）, reflecting the complicated metallogenic environment and multi separations. Contents of EREE vary greatly in different rocks and ores, with all LREE/HREE 〉 1, showing LREE richer than HREE. In the bauxite layer, content of soil like REE is high, but content of dense REE is low. There is a positive correlation between REE contents and qualities of the bauxite ore. REE content in the bauxite layer is almost same with that in the lower-middle Silurian Hanjiadian group （S1-2hj）. Deposit genesis belongs to ancient efflorescent shell sedimentary.
出处
《矿物学报》
CAS
CSCD
北大核心
2009年第4期458-462,共5页
Acta Mineralogica Sinica
基金
中国地质大调查项目(编号:1212010630406)
2008年贵州省省长基金项目
关键词
铝土矿床
地球化学特征
贵州务川
geoehemical characteristic
bauxite deposit
Wuchuan County
