| PDF: | |
| Time: | 1997 |
| Journal: | Earth Science－Journal of China University of Geosciences |
| Volumn: | 22 |
| Issue: | 1 |
| Pages: | 57-61 |
| Type: | EI |
| Author: | Rihui Cheng,Zhaojun Liu,Pujun Wang |
Abstract: | Being the main parts in the basin,s filling, volcanic materials formed three volcanic-sedimentary cycles with sedimentary deposits during J3 - K|, when volcanism was active. The geological significance of volcanic events not only reflected the background of geodynamics, but also affected basin(s filling and evolution, sequence and coal accumulation. The volcanic rocks in the eastern part of Songliao Basin can be classified into two types according to their positions in strata: the volcanic rock member-the main filling materials of early stage of a cycle; the volcanic layeroccurring bewteen the sedimentary beds. The analyses of the volcanic members led to the knowledge about the extensional tectonic background of Songliao basin at the stage of rifting.The studies of volcanic layers detailed the basin\'s filling processes influenced or controlled by the volcanic events, and also suggested major coal accumulation occurring before maximum lake flooding in this area. |