| Time: | 1992 |
| Journal: | Acta Geologica Sinica |
| Volumn: | 66 |
| Issue: | 2 |
| Pages: | 327-338 |
| Type: | Other |
| Author: | Zhaojun Liu,Dongpo Wang,Li Liu,Wanzhu Liu,Pujun Wang,Xiaodi Du,Guang Yang . |
Abstract: | The Songliao bas in is a Mesozoic continental rift bas in. The rupture of the lithosphere in the Late Jurass ic brought about the eruption of basaltic magma. The evolution of the bas in progressed through 6 stages- , pre-rift doming, extens ional fractering, fault subs idence, fault downwarping, downwarping and shringkage, rensulting in the depos ition of a continental sedimentary column nearly 10000 m thick. There are different depositionai sequences in these stages; the at composed mainly of .volcanic rocks and alluvial fan-fan delta -lacustrine fades -swamp facies in the fault subsidence stage; mainly of alluvial plain-lacustrine facies in the fault downwarping stage; the mainly of alluvial plain-delta-extens ive lacustrine facies in the downwarping stage; and that dominated by alluvial plain deposits with subordinate minor alluvial fan and re lict lacustrine facies in the shrinkage stage. These constitute a composite depositionai column fully displays the sedimentary characteristic of a failed continental rift basin. Facts indicate that two large-scale lake \"invas ions\", synchronous with the global relative rise of sea level, which took place in the downwarping stage of the bas in development, leading to the connection between lake and sea. |