| PDF: | |
| Time: | 2003 |
| Journal: | J. Jilin University (Earth Sci Edition) |
| Volumn: | 33 |
| Issue: | 4 |
| Pages: | 479-484 |
| Type: | Other |
| Author: | Weihai Song,Xingzhou Zhang,Pujun Wang |
Abstract: | In the middle section of the eastern China continental margin, there are five tectonic-volcanic peaks in Tertiary, they are 58～46 Ma, 38 ～36 Ma, 26～24 Ma, 20 ～16 Ma and 8 ～4 Ma respectively. The lithology of volcanic rocks formed in these periods is fairly simple, mostly being basalt.Associated with rift action, most of volcanic rocks are buried under the Cenozoicoil-bearing fault basins and only Paleocene, Miocene and Pliocene volcanic rocksare exposed in the field.It has been showed that volcanism exists through the entire course of the basin\'s evolution.Volcanic rocks in the early period of basin formation marks the beginning of rift volcanism.Volcanism is relatively intense in the middle period of basin formation.Not only great deal of volcanic rocks, large amount of source rocks also were formed.In thelate period of basin formation volcanism is weak.The centers of Cenozoic volcanism also are frequently the centers of basins in which much oil and gas were accumulated. |