陕西宝鸡金陵河盆地下白垩统和尚铺组砾石统计及地质意义  

Gravel Characteristics of the Lower Cretaceous Heshangpu Formation in Jinling River Basin, Baoji City, Shaanxi Province and the Geological Significance

作　　者：赵雨 樊双虎[1,2] 孙泽文 ZHAO Yu;FAN Shuang-hu;SUN Ze-wen(School of Earth Science and Resources,Chang,an University,Xi'an 710054,China;Key Laboratory of Western Mineral Resources and Geological Engineering,Ministry of Education,Xi'an 710054,China)

机构地区：[1]长安大学地球科学与资源学院,陕西西安710054 [2]国土资源部岩浆作用成矿与找矿重点实验室,陕西西安710054

出　　处：《河北地质大学学报》2021年第2期44-52,共9页Journal of Hebei Geo University

摘　　要：通过野外测量砾石粒径、方位,进行砾石组构统计分析,研究结果表明,砾石粒径范围在0.7~8.5 cm之间,主要以细砾岩为主,水动力条件不稳定;砾石球度F范围在0.91~1.65之间,扁度值在2.02~2.24之间,磨圆度P的范围在52.9~71.67之间,砾态系数在1.32~2.20之间;砾性分析通过统计野外砾石岩性得出花岗质岩最大平均含量为66.5%,变质岩次之平均含量为24.33%,石英岩的平均含量为11.67%,砂岩和硅质岩含量较少;砾向分析通过野外实测数据绘制砾石a-b面倾向玫瑰花图,得出盆地有多个古流向,主要古流向为西北和东南向。综合分析得出金陵河盆地和尚铺组以流水成因的冲洪相沉积为主,物源主要来源于盆地西北及南东侧秦岭—祁连造山带。Through the gravel particle size and direction from field survey,statistical analysis of debris fabric is conducted.The research results indicate that the gravel particle size ranges from 0.7 cm to 8.5 cm,especially granule conglomerates.The hydrodynamic conditions are unstable.Gravel sphericity F ranges from 0.91 to 1.65,the flattening value is 2.02~2.24,and the roundness P range is 52.9~71.67.The gravel coefficient ranges is varied from 1.32 to 2.20.By recording field gravel lithology,the maximum average content of granitic is 66.5%through gravel property analysis,followed by metamorphic rocks(24.33%).The average content of quartzite is 11.67%while sandstone and siliceous rocks have the less content.Through the measured field data,the rose diagram of gravel a-b side is plotted in the gravel-oriented analysis,gaining the multiple paleocurrent directions in the basin.The main paleocurrent directions include northwest and southeast directions.Through the comprehensive analysis,Heshangpu Group,Jinling river basin is based on the alluvial deposition with the flowing water cause.The provenance is derived from northwest of the basin and Qinling Mountain-Qilian orogenic belt in the south east.

关 键 词：金陵河盆地 砾石组构分析 下白垩统 和尚铺组 

分 类 号：P588.21[天文地球—岩石学]