图3. 小秦岭地区密度色块分区
1—第四系;2—新近系;3—蓟县系巡检司组;4—长城系高山河组;5—太华群上亚群二段;6—太华群上亚群一段;7—太华群中亚群;8—太华群下亚群;9—黑云二长花岗岩;10—石英正长斑岩;11—中粒黑云二长花岗岩;12—细粒黑云二长花岗岩;13—元古宙基性岩脉;14—花岗伟晶岩;15—太古宙基性岩脉;16—太古宙花岗岩;17—物探剖面及编号;18—采集标本数;19—平均密度及范围(g·cm^-3);20—地震剖面;21—钻孔及编号

Fig.3. Density color-blocks zone map in Xiaoqinling area
1—Quaternary;2—Tertiary;3—Xunjiansi formation of Jixian system;4—Gaoshanhe formation of Changcheng system;5—the second upper subgroup of the Taihua group;6—the first upper subgroup of the Taihua group;7—the middle subgroup of the Taihua group;8—the under subgroup of the Taihua group;9—monzonitic granite;10—quartz syenite porphyry;11—middle-grain biotite monzonitic granite;12—fine-grain monzonitic granite;13—Proterozoic basic veins;14—granite pegmatite;15—Archaic basic veins;16—Archaean granite;17—magnetotelluric sounding profile and stratum code;18—number of specimens collected;19—average density and range(g·cm^-3);20—seismic section;21—boreholes and their numbering