平衡剖面技术在台湾海峡盆地西部构造演化研究中的应用  

Application of balanced cross section technique to the study of tectonic evolution of western Taiwan Strait Basin

作　　者：韦振权 张莉[1] 帅庆伟 易海[1] 钱星 雷振宇 王衍棠 WEI Zhenquan;ZHANG Li;SHUAI Qingwei;YI Hai;QIAN Xing;LEI Zhenyu;WANG Yantang(Key Laboratory of Marine Mineral Resources,Ministry of Natural Resources,Guangzhou Marine Geological Survey,Guangzhou 510075,China)

机构地区：[1]自然资源部海底矿产资源重点实验室中国地质调查局广州海洋地质调查局,广州510075

出　　处：《海洋地质与第四纪地质》2018年第5期193-201,共9页Marine Geology & Quaternary Geology

基　　金：海洋地质保障工程(GZH201200511;GZH200800504)

摘　　要：以台湾海峡盆地西部为研究对象,在地震资料构造解释的基础上,选取能控制区域构造格局的2条典型剖面,运用2D Move软件分别对其进行平衡剖面恢复,并计算出各剖面不同时期的伸展量、伸展率和伸展系数,初步计算各凹陷在不同时期的基底构造沉降量,以此为基础对台湾海峡盆地西部的构造演化过程及其区域性差异进行了定量研究。研究结果显示:(1)研究区的伸展强度和基底构造沉降量在始新世和中新世之间均急剧减小,反映渐新世是一个构造转换时期;(2)研究区在新生代表现为古新世至早始新世持续断陷作用—中始新世差异升降—始新世末至渐新世隆升剥蚀—中新世之后稳定缓慢坳陷沉积;(3)台湾海峡盆地在新生代大致经历了古新世-始新世断陷演化阶段、中新世坳陷演化阶段和上新世—第四纪前陆盆地演化阶段。Taking the western Taiwan Strait Basin as the research subject,two large regional sections,which control the regional tectonic framework,are selected to restore balance sections using 2 D Move software.The extension amount,the extensional ratio and the extensional coefficient are calculated,in addition to the preliminary calculation of structural subsidence amount of the basement for each sag in the research area.Upon the basis,the tectonic evolution process and its regional differentiation in Western Taiwan Strait Basin are quantitatively studied.The results suggest that：（1）Both extensional intensity and structural subsidence amount of basement are drastically decreased from Eocene to Miocene,indicating that Oligocene is a transitional period of tectonics;（2）There is continuous fault subsidence from Paleocene to early Eocene,differential uplifting in Middle Eocene and slow subsidence after Miocene in the research area;（3）Taiwan Strait Basin has experienced four stages of evolution i.e.fault subsidence from Paleocene to Eocene,depression in Miocene and fore-arc basin between Pliocene and Quaternary.

关 键 词：台湾海峡盆地西部 构造演化 伸展强度 基底构造沉降量 平衡剖面 

分 类 号：P631.4[天文地球—地质矿产勘探]