广西平果原生铝土矿的物源多样性

Multiplicity of provenances in Pingguo primary bauxite,Guangxi

对平果原生铝土矿的物源进行识别，可以明确成矿物质的搬运、沉积过程，对成矿预测具有一定的指导意义．平果原生铝土矿成矿时处于黔桂盆地，被数个古陆包围，这种古地理格局决定了铝土矿的物源不可能是单一的，区域内的茅口组灰岩以及岩浆岩、变质岩都有可能是铝土矿的物源．依据古地理格局，收集了该区域内已有的茅口组灰岩、二叠纪及二叠纪之前的岩浆岩：变质岩的主量元素和稀土元素数据．物源端元的Al／Ti值有的达到铝土矿Al／Ti值的2～3倍，有的仅约为铝土矿Al／Ti值的1／3．各物源端元的稀土元素配分模式均与铝土矿不同，基于原生铝土矿、各物源端元的稀土元素数据Q型聚类分析表明原生铝土矿与各物源端元的差距较大．综上认为平果原生铝土矿是来自各不同物源的沉积物经过复杂混合的结果，表明平果铝土矿具有物源多样性．

Provenance identification of Pingguo primary bauxite can know the mineralization process, clear deposit metallogenic regularity, and guide the metallogenic basin, surrounded by a be single, and Maokou A1/Ti is 2 ~3 times number of ancient lands. limestone and igneous roc prediction. Pingguo primary bauxite is native in Guizhou - This ancient geography ks, metamorphic rocks Guangxi determines that the bauxite provenance cannot are likely to be provenances of bauxite. Their or 1/3 of primary bauxite. And REE patterns of the Maokou limestone, igneous rocks and metamorphic rocks are different with primary bauxite, Q cluster analysis which is based on data of REE shows that there are obvious differences between the Maokou limestone, igneous rocks, metamorphic rocks and primary bauxite. This is the results of different provenances complex mixed. It shows that the provenances of Pingguo primary bauxite are diverse.