Lithogeochemical characteristics of Balipo molybdenum deposit and its prospecting significance,Huaxian,Shaanxi Province.
Lithogeochemical characteristics of Balipo molybdenum deposit and its prospecting significance,Huaxian,Shaanxi Province.
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作者：
Jiao Jian
陕西华县八里坡斑岩二长花岗岩位于华北地块南缘，在该区钻出了一些中等规模的钼矿体。新的岩石地球化学资料表明，SiO2含量平均值在69.87% ~ 73.76%之间，Al2O3=13.74%~15.74%，多数大于15%，MgO=0.25%~0.46%,K2O=3.85%~4.51%,K2O%Na2O%, δEu=0.70~0.77，呈弱负异常，Sr/Y40,Zr/Sm20；Sr的含量在256.8×10-6 ~ 637.6×10-6之间变化，多数高于400×10-6；Y=6.63×10-6~13.72×10-6,Yb=0.98×10-6~1.86×10-6。Sr、Nd同位素特征为（87Sr/86Sr）i =0.709~0.710,eNd(t)=-22~-20，与中国东部胶东—大别与成矿有关的c型绿质岩相似。通过对东秦岭西部八里坡钼矿床与东秦岭东部南泥湖超大型钼矿床的地质、地球化学特征的比较，并结合一些钻探，认为八里坡钼矿床西北部深部具有良好的钼、钨找矿潜力。
Balipo porphyritic monzonitic granite in Huaxian,Shaanxi Province is located on the southern edge of North China Block,in which some middle scale Mo orebodies have been discovered by dills.New lithogeochemical data show that the average of SiO2 content varies from 69.87% to 73.76%,Al2O3=13.74%~15.74% and most are over 15%,MgO=0.25%~0.46%,K2O=3.85%~4.51%,K2O%Na2O%;δEu=0.70~0.77,appearing weak negative anomaly,Sr/Y40,Zr/Sm20;the content of Sr varies from 256.8×10-6 to 637.6×10-6 and most are higher than 400×10-6;Y=6.63×10-6~13.72×10-6,Yb=0.98×10-6~1.86×10-6.Sr and Nd isotopes are characterized by(87Sr/86Sr)i =0.709~0.710,eNd(t)=-22~-20,which are similar with that of C-type adakitic rocks related to mineralization in Jiaodong-Dabie eastern part of China.Very similar geological and geochemical features by comparing Balipo Mo deposit in the west part of East Qinling with Nannihu super-large Mo-W deposit in the east part of East Qinling,combining with some drills,indicate a good prospecting potential for Mo and W in the northwest deep part of Balipo Mo deposit.