Evolution of Neoproterozoic-Mesozoic Sedimentary Basins in Bangonghu-Shuanghu-Nujiang-Changning-Menglian Suture Zone
Luo Liang
An Xianyin
Wu Nianwen
Wang Chenggang
Zhan Hongyu
Abstract：In the light of the stratigraphic framework,the authors collected and summarized evidences of the rock formations and their ages in the sedimentary basins of the Bangonghu-Shuanghu-Nujiang-Changning-Menglian suture zone.With the guid-ance of the plate tectonic theory and continental dynamics,the basin types are also classified in the study area to explore the temporal and spatial evolution of the basins and to better the understanding of the opening,extension and closing of the Paleo-Tethys oceans.Four evolutional stages of the Pre-Cenozoic Paleo-Tethys oceans corresponding to the basinal evolution in the study area are distinguished.It is found that Ordovician ophiolitic mélange of MORB characteristics occurred in both the Long-mu-Shuanghu and the Changning-Menglian oceanic basin,two of which prove to have experienced arc-continent collision during the end Permian-Early Triassic transition,suggesting a united remnant oceanic basin of the Paleo-Tethys.The remnant Paleo-Tethys represented by the Bangonghu-Nujiang oceanic basin,on the other hand,opened in the Early Carboniferous and evolved to a closure in the Early Cretaceous,marking the final disappearance of the Paleo-Tethys.
Keywords：ophilitic mélangePaleo-Tethysstratigraphic frameworksedimentologytectonicsbasin evolution
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：16( 1169-1184 )