南海南缘礼乐盆地在南海扩张前的位置恢复  

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

作　　者：陈雯霖 郑求根[1] 黄一鸣 张懿 林畅松[1] CHEN Wenlin;ZHENG Qiugen;HUANG Yiming;ZHANG Yi;LIN Changsong(School of Ocean Sciences,China University of Geosciences(Beijing),Beijing 100083,China;Shale Oil and Gas Department,Shenyang Geological Survey Center,China Geological Survey,Shenyang 110034,China)

机构地区：[1]中国地质大学(北京)海洋学院,北京100083 [2]中国地质调查局沈阳地质调查中心页岩油气室,辽宁沈阳110034

出　　处：《地学前缘》2023年第5期420-429,共10页Earth Science Frontiers

基　　金：国家自然科学基金项目(42230816)。

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。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.

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 

分 类 号：P736.2[天文地球—海洋地质] P318[天文地球—海洋科学]