Implications on the Early Cenozoic palaeogeographical reconstruction of SE Eurasian margin based on northern South China Sea palaeo-drainage system evolution
Abstract：During the Early Cenozoic,the southeastern margin of Eurasian Plate has experienced multiple episodes of large-scale palaeographical changes. Overall,with the rapid spreading of the South China Sea(SCS),the Mesozoic orogenic belts in southeast China Continental Block continuingly suffered from erosional processes. Drastic variations of provenance distribution patterns took place in the northern SCS in light of our Eocene-Lower Miocene “source-to-sink”analysis. During the Eocene-Early Oligocene,“Kontum-Ying-Qiong”River has delivered large abundance of materials from the western palaeo-uplifts into the eastern SCS basins. Briefly,most southern areas including Zhu-II Depression were dominated by this western sedimentary source,while Zhu-I Depression was mainly influenced from the palaeo-Pearl River to the north. During the Late Oligocene,Pearl River system turned to develop into a larger scale,which gradually exceeded the impact of the western provenance. The sedimentary distribution pattern was completely changed when it came to the Early Miocene. With much less hindrance from Panyu-Low-Uplift in the middle,the Pearl River was then transporting voluminous sediments from the South China hinterland into Zhu-II Depression. By contrast,“Kontum-Ying-Qiong”River simply cast fairly limited influences on Qiongdongnan Basin. From west to east,the provenance was gradully replaced from Kunsong Block to Hainan Island. Actually,the Central Canyon which was subsequently formed in the Late Miocene,which was considered as a residual structure of the palaeo “Kontum-Ying-Qiong”River. As a conclusion,the discovery of palaeo “Kontum-Ying-Qiong”River as well as the Pearl River evolution reconstruction proves to be of great significance on (1)both palaeogeography of the SCS and palaeogeomorphology of the southeastern Eurasian margin in the Early Cenozoic; (2)the petroleum industrial exploration on the SCS basins.
Shao Lei,Cui Yu-Chi,Qiao Pei-Jun et al. Implications on the Early Cenozoic palaeogeographical reconstruction of SE Eurasian margin based on northern South China Sea palaeo-drainage system evolution[J]. JOPC, 2019, 21(2): 216-231.
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