| PDF: | |
| Time: | 2011 |
| Journal: | Journal of Stratigraphy |
| Volumn: | 35 |
| Issue: | 2 |
| Pages: | 122-128 |
| Type: | Other |
| Author: | Di Yang,Pujun Wang,Jiangping Liang,Huangfeng Tang,Yulong Huang,Li Bao. |
Abstract: | Volcanic activities recorded in the Cretaceous Yingcheng Formation in the Songliao Basin are characterized by multiple eruption centers,multiple eruption cycles,and complex and variable volcanic lithologies.On the basis of volcanic sequence and assemblage,volcanic eruption cycles in the Yingcheng Formation in the Songliao Basin are inferred to represent variations in the intensity of volcanic activity(e.g.,from quiet to intense and then to quiet).An eruption cycle consists of one or several eruption stages.Furthermore,lithologic evolution during an eruption cycle is directional,basic to intermediate and then to acidic.Analysis of drill cores and field sections shows that the Member 1(K_1y1)and Member 3(K_1y3)of Yingcheng Formation each consist of three volcanic eruption cycles. |