甘肃北山三个井组碎屑岩地质、地球化学特征及其沉积构造背景  

Geological and geochemical characteristics of clastic rock in the Three Wells Formatrion in Beishan area,Gansu

作　　者：翁凯[1,2] 张雪[1] 梁积伟[1] 

机构地区：[1]长安大学地球科学与资源学院,西安710054 [2]西安地质矿产研究所,西安710054

出　　处：《地质找矿论丛》2013年第3期434-440,共7页Contributions to Geology and Mineral Resources Research

基　　金："西北基础地质调查成果集成与综合研究"(编号:1212011220649);"北山-祁连成矿带地质矿产综合研究"(编号:1212011085077)资助

摘　　要：为查明甘肃北山地区三个井组沉积岩的物质来源和形成背景,通过对该地层砾岩和粗砂岩进行野外观察和镜下鉴定,分析细砂岩和泥岩的地球化学特征,认为三个井组沉积岩物质成分复杂,分选磨圆中等,具有快速堆积的特征;沉积物质主要来源于火山岛弧和活动大陆边缘遭受剥蚀的造山带,沉积区具有周缘前陆盆地的特征。In order to find out material sources and rock-forming background of sedimentary rock in the three wells formation in Gansu Beishan area, the detailed field observation and microscopic identification were made on the conglomerate and grit in the formation and and geochemical characteristics of the fine sandstone and mudstone are analysed. It is considered that the Three Wells Formation is complicated in source materials with medium sorting grinding and quick accumulation. The swedimentary materials main- ly come from volcanic island arc and active continental marginal orogenic belts and the sedimentation area is characterized by the marginal foreland basin.

关 键 词：三个井组 沉积岩 地球化学特征 构造背景 北山地区 甘肃省 

分 类 号：P588.21[天文地球—岩石学] P581[天文地球—地质学]