矿物学填图揭示金矿脉的隐蔽分带性——以玲珑金矿52号脉为例

MINERALOGICAL MAPPING AS A MEANS OF REVEALING THE HIDDEN ZONATION OF GOLD DEPOSITS AS EXAMPLE BY VEIN NO.52 IN LINGLONG GOLD MINE

胶东许多金矿脉的矿物组合很简单,几乎全是石英、黄铁矿,难于进行分带性研究。通过对玲珑金矿52号脉的矿物学填图研究,发现该矿脉从上向下,黄铁矿的晶体形态{111}减少而{210}增加,+α值减小,P导型减少而N导型增加;石英的热发光强度增大。这些物性参数在矿脉空间的规律性变化,揭示了外观很单一的矿脉内部隐蔽着的空间分带性,并发现与金矿化强度有密切关系。研究结果还表明,52号脉在海拔+170m以上主要为上部矿体特征,受剥蚀程度不大,深部远景还大;成矿热液近于直立运移并具有水平方向的等距波动性;预测三个区段深部应保持良好矿化。以后的钻探工程证实了预测。

As many Au-bearing veins in eastern Shandong are very simple in mineralogy (mainly quartz and pyrite), it is difficult to reveal their zonation.Based on the mineralogical mapping of Vein No. 52 in the Linglong gold mine, it was found that the {111} form of pyrite decreased while the {210} form increased from the top downwards, that the thermal electric coefficients (+(?)) and P conduction type of pyrite reduced downwards, but the thermoluminescence intensity of quartz increased. Regular variations of the parameters at different levels suggested a spacial zonation hidden in the vein. It was also found that the ore above +170m of Vein No. 52 belongs to the upper orebody, which suffered less denudation, and more ores would be expected at depth. Mineralizing hydrothermal fluids moved almost vertically upwards. Prediction of mineralization in three locations of the vein has been confirmed by further drilling work.