Recover the Liyue Basin position in the southern margin of the South China Sea before seafloor spreading

doi:10.13745/j.esf.sf.2023.2.75

Abstract

Abstract:

Based on the conceptions that magnetic stripping is symmetrical about a mid-ocean ridge axis and that magnetic stripes from the same period are isochronic, using the existing magnetic anomaly data of the South China Sea, and assuming the positions of the South China Block and the northern margin of the South China Sea are relatively fixed and the southern margin of the South China Sea began to drift southward since 32 Ma, this paper restores the seafloor spreading history of the South China Sea and recovers the relative position of the Liyue Basin in various periods. The Liyue Basin was located next to the southeast rim of the Pearl River Mouth Basin before seafloor spreading. This finding is further supported by the comparison results of basement properties, development and sedimentary characteristics of Mesozoic strata, as well as Cenozoic tectonic activities and subsidence and sedimentary characteristics between the Liyue Basin and the northern margin basin of the South China Sea. This study provides an essential reference for the structural evolution, sedimentary filling characteristics, sediment source analysis, and petroleum geological conditions of the Liyue Basin.

Key words: southern margin of the South China Sea, northern margin of the South China Sea, Liyue Basin, position recovery, Pearl River Mouth Basin, Qiongdongnan Basin

CLC Number:

P736.2
P318

CHEN Wenlin, ZHENG Qiugen, HUANG Yiming, ZHANG Yi, LIN Changsong. Recover the Liyue Basin position in the southern margin of the South China Sea before seafloor spreading[J]. Earth Science Frontiers, 2023, 30(5): 420-429.

Figures/Tables 5

Fig.1 Map showing location of the South China Sea and its sub-basins, location of three comparative exploration wells (adapted from [1]), magnetic stripping patterns in the South China Sea (adapted from [2-3]), and structural units of the Liyue, Pearl River Mouth and Qiongdongnan Basins (according to CNOOC)

Fig.2 Stratigraphic correlation diagram of the Liyue, Pearl River Mouth and Qiongdongnan Basins. Modified after [5].

Fig.3 Restoration of seafloor spreading history of the South China Sea and position of the Liyue Basin

Fig.4 Basement lithofacies of the Pearl River Mouth-Qiongdongnan Basin, northern margin of the South China Sea. Modified after [18].

Fig.5 Stratigraphic correlation diagram of well LF35-1-1, Pearl River Mouth Basin and well Sampaguita-1, Liyue Basin. Adapted from [22].

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