摘要
将板溪群和冷家溪群杂砂岩全岩岩石化学分析结果在SiO_2-K_2O/Na_2O图解、SiO_2/Al_2O_3-K_2O/(Na_2O+CaO)图解、Na_2O-K_2O图解以及(K_2O+Na_2O)—Al_2O_3图解上投点,发现多数板溪群杂砂岩样品点落在被动大陆边缘区,而冷家溪群杂砂岩样品点则多落入活动大陆边缘区。因此认为,板溪群沉积于被动大陆边缘,而冷家溪群沉积于活动大陆边缘,它们形成于不同的地质演化阶段。
Based on the whole rock analysis, SiO_2—K_2O/Na O, SiO_2/Al_2O_3-K_2O/(Na O+CaO), Na2O-K_2O and(K_2O+Na_2O)-Al_2O_3 diagrams are made, in which most of the graywack samples from Banxi Group fall into passive margin area (PM), while those from Lengjiaxi Group mostly fall into active margin area(ACM). Therefore, it is believed that Banxi Group was deposited ia a passive margin and Lengjiaxi Group in an active margin. They were formed in different geological episodes.
出处
《湖南地质》
1991年第3期186-188,206,共4页
Hunan Geology
关键词
板溪群
岩石化学
大地构造
背景
Petrochemical discriminant diagram
Geotectonic setting
Banxi Group
Lengjiaxi Group
