南海南缘礼乐盆地在南海扩张前的位置恢复

doi:10.13745/j.esf.sf.2023.2.75

摘要/Abstract

摘要：

本文依据洋中脊两侧磁条带的对称性和同期磁条带的等时性,利用南海已有的磁异常条带资料,假定华南大陆连同南海北缘位置相对固定,南海南缘从32 Ma开始向南漂移,恢复了南海的扩张历史和礼乐盆地在不同时期的相对位置。结果表明,礼乐盆地在南海扩张前的位置紧邻珠江口盆地东南缘。这一结果从礼乐盆地与南海北缘盆地在基底性质、中生代地层的发育情况和沉积特征以及新生代构造活动和沉降沉积特征的对比得到了进一步佐证,为礼乐盆地的构造演化、沉积充填特征和沉积物源分析、石油地质条件研究提供了重要参考。

关键词: 南海南缘, 南海北缘, 礼乐盆地, 位置恢复, 珠江口盆地, 琼东南盆地

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

中图分类号:

P736.2
P318

陈雯霖, 郑求根, 黄一鸣, 张懿, 林畅松. 南海南缘礼乐盆地在南海扩张前的位置恢复[J]. 地学前缘, 2023, 30(5): 420-429.

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.

图/表 5

图1 南海周缘盆地分布、南北3口对比井位置(据文献[1])以及南海磁条带展布(据文献[2-3])和礼乐、珠江口、琼东南盆地构造单元划分(据中海油)

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)

图2 礼乐盆地与珠江口、琼东南盆地对比综合柱状图(据文献[5]修改)

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

图3 南海扩张史和礼乐盆地位置恢复图

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

图4 南海北缘珠江口-琼东南盆地基底岩性分布图(据文献[18]修改)

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

图5 珠江口盆地LF35-1-1井与礼乐盆地Sampaguita-1井地层对比(据文献[22])

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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