重庆洪官渡铝土矿床镓元素地球化学特征及其成矿环境探讨

重庆洪官渡铝土矿床伴生Ga含量普遍超过了工业综合利用指标。Ga与Cr、TiO₂呈强正相关,与V呈中等程度的正相关,与Al₂O₃、Fe₂O₃不相关。根据Sr/Ba、u/Th、Ga/Al等地球化学指标值特征,判断该铝土矿床的含矿岩系属海陆交互沉积,但以陆相沉积为主;同时,洪官渡铝土矿床是在以淡水作用为主的弱酸性氧化环境的中形成。

Geochemical signatures and mineralization environments of the element gallium from the Hongguandu bauxite deposit in Chongqing

The accessory element gallium contents in the Hongguandu bauxite deposit in Chongqing are greater than the minimum industrial indices for the multipurpose utilization. It is inferred from the geochemical indices such as Sr /Ba,U /Th and Ga /Al ratios that the ore-bearing rock series should belong to the continental-dominated marinecontinental alternative deposits in the bauxite deposit. There is a highly positive correlation of Ga contents with Cr and TiO2 contents and a moderately positive correlation of Ga contents with V contents,while no correlation with Al2O3 and Fe2O3contents. It follows that the Hongguandu bauxite deposit in Chongqing resulted from the freshwater processes in the weakly acidic oxidized environments.