南海北部陆缘古双峰-笔架碰撞造山带空间展布特征

发布时间：2018-01-02 12:18

  本文关键词：南海北部陆缘古双峰-笔架碰撞造山带空间展布特征　出处：《海洋地质与第四纪地质》2016年04期 　论文类型：期刊论文

  更多相关文章： 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

【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。
[Abstract]:In order to understand the spatial extension range of paleo-bimodal penframe collision orogenic belt and the characteristics of fold and fault structure development in the northern continental margin of the South China Sea, the stratigraphic and structural interpretation of 22 multi-channel reflection seismic profiles in the study area was carried out. Combined with the comprehensive interpretation of drilling lithostratigraphic data, structural analytical analysis method is used. The basic structural geometry characteristics of the paleo-bimodal penholder collision orogenic belt located in the northern continental margin of the South China Sea were studied by screening method and stripping method. Comprehensive analysis of the bottom interface of the Cenozoic strata after the Cenozoic tectonic subsidence. (. The spatial fluctuation morphology and the deformation characteristics of the pre-Cenozoic strata are found in the reflection earthquake TG interface. The paleo-bimodal penholder collision orogenic belt is distributed in the NEE direction, and its core is located at the lower slope of the continental and oceanic transitional zone in the southeast of the Pearl River mouth basin, that is, the position of the No. 06 survey line and its vicinity. The Qiongdongnan basin is the NWW wing of the orogenic belt. The results can be used to reconstruct the tectonic framework of the South China Sea in the late Cenozoic and to provide a basis for the observation of tectonic facts in the study of the genetic mechanism of the South China Sea.
【作者单位】： 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;中国科学院大学;
【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)
【分类号】：P736
【正文快照】： 古双峰-笔架碰撞造山带是刘海龄等近年来提出的关于南海地区前新生代晚期大地构造单元的一个新概念[1]。前人通过对比南海南、北部陆缘中生代地层断层和褶皱特征,发现南海北部陆缘发育自南向北的逆冲推覆,南海南部陆缘发育自北向南的逆冲推覆的地层-构造特征的基础上初步提出，

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