广西十万大山盆地盖层地质特征及形成环境探讨  

Geological Characteristics and Formation Environment of Cover Layer in Shiwandashan Basin,Guangxi

作　　者：刘瑶[1] 徐争启[1,2] 赵晶[1] 程发贵 唐纯勇 汪刚[1] 

机构地区：[1]成都理工大学地球化学系,四川成都610059 [2]成都理工大学地学核技术四川省重点实验室,四川成都610059 [3]广西壮族自治区305核地质大队,广西柳州545005

出　　处：《广东微量元素科学》2015年第8期11-15,共5页Trace Elements Science

基　　金：广西地质矿产勘查局科研项目资助

摘　　要：十万大山盆地盖层划分是根据印支运动第三幕-龙华运动造成的中三叠系不整合面为界线划分的,包括上三叠系、侏罗系、白垩系以及第三系的陆相和下部一部分海陆过渡相的沉积物。凤凰山剖面出露侏罗系地层,从下往上依次为百姓组和那荡组。对剖面样品进行微量稀土元素参数分析,Th-Sc-Zr/10判别图解指示碎屑岩形成的构造背景为大陆岛弧环境。δEu、δCe及V/(V+Ni)比值表明当时沉积环境以厌氧的弱还原环境为主。The classification of cover in shiwandashan basin is according to the third act of the indosinian movement- longhua movement caused the formation of unconformity surface as the lines between,including on the upper triassic,jurassic,cretaceous and tertiary continental and the marine sediments in the transitional phase on lower part. Phoenix mountain profile exposed Jurassic stratum,from down to up in turn baixing group and the nadang group. Analysis of trace- rare earth elements parameters of profile samples,Th- Sc- Zr /10 discrimination diagram indicating the structural setting of clastic rock is continental island arc environment. δEu, δCe and V /（ V ＋ Ni） ratio show that the sedimentary environment is given priority with anaerobic weak reduction environment.

关 键 词：稀土元素 构造背景 大陆岛弧 沉积环境 

分 类 号：P595[天文地球—地球化学]