南海北部陆缘古双峰-笔架碰撞造山带空间展布特征  

SPATIAL DISTRIBUTION OF ANCIENT SHUANGFENG-BIJIA OROGEN ON NORTHERN CONTINENTAL MARGIN OF SOUTH CHINA SEA

作　　者：周洋[1,2] 刘海龄[1] 朱荣伟[1,2] 沈宝云[1,2] 黎雨晗 王印[1,2] 

机构地区：[1]中国科学院边缘海与大洋地质重点实验室,中国科学院南海海洋研究所,广州510301 [2]中国科学院大学,北京100049

出　　处：《海洋地质与第四纪地质》2016年第4期77-84,共8页Marine Geology & Quaternary Geology

基　　金：国家自然科学基金项目(41476039;41276048;91328205);中国海及邻域地质地球物理及地球化学系列图项目(GZH200900504-WX02)

摘　　要：为了解南海北部陆缘古双峰-笔架碰撞造山带空间延伸范围、褶皱和断裂构造发育特征,通过对研究区22条多道反射地震剖面资料的地层-构造解释,结合钻井岩石地层资料的综合解释,运用构造解析分析法、筛选法以及回剥法对位于南海北部陆缘的古双峰-笔架碰撞造山带的构造几何学基本特征进行了研究。综合分析筛除了新生代构造沉降量后的新生代地层底界面(反射地震Tg界面)的空间起伏形态特征和前新生代地层变形特征发现,古双峰-笔架碰撞造山带呈NEE向展布,其核部位于珠江口盆地东南部的陆洋过渡带下陆坡位置,即06号测线所在位置及其附近,琼东南盆地为造山带的NWW翼。此研究结果可为南海地区前新生代晚期大地构造格局重建、南海成因机制研究提供构造事实观测依据。In order to reveal the spatial extent and the development characteristics of the folds and faults of the ancient Shuangfeng-Bijia collision orogenic belt in the northern continental margin of the South China Sea,stratigraphic and structural architectures of 22 seismic profiles are studied in details in addition to the comprehensive interpretation of lithological information from drilling holes.With the help of structural analysis,deleting the Cenozoic tectonic subsidence,the basic geometric features of the ancient ShuangfengBijia collision orogenic belt are disclosed.After the integrated analysis of spatial fluctuation characteristics of the bottom boundary of the Cenozoic（seismic reflection surface of Tg）,screening off the tectonic subsidence of Cenozoic,the deformation features of Pre-Cenozoic strata are observed.Spatially,the ancient Shuangfeng-Bijia collision orogenic belt is stretched in NEE direction,and the core part of the orogen is located on the southeastern slope of ocean-continent transition zone in the Pearl River Mouth Basin.It is close to 06 seismic line and next to the Qiongdongnan basin.In summary,the research results provided observation facts for reconstruction of late Mesozoic tectonic framework in the South China Sea,which is helpful for understanding the formation mechanism of the South China Sea.

关 键 词：空间延伸范围 前新生代地层 构造变形 古双峰-笔架碰撞造山带 南海北部陆缘 

分 类 号：P738[天文地球—海洋地质]