莺歌海盆地由沉积负载引起的裂后期快速沉降的耦合模式  

A COUPLED MODEL INCORPORATING LOWER-CRUSTAL FLOW IN RESPONSE TO POST-RIFT SEDIMENTARY LOAD OF YINGGEHAI BASIN'S RAPID SUBSIDENCE

作　　者：宋维宇[1] 

机构地区：[1]中国地质大学,武汉430074

出　　处：《海洋地质动态》2010年第8期8-14,共7页Marine Geology Letters

基　　金：973项目"南海大陆边缘动力学及油气资源潜力"(2007CB411700)三级课题"南海北部莺歌海-琼东南盆地形成演化与高温高压成藏机理";中国地质大学资源学院与中海石油(中国)有限公司湛江分公司合作的项目"莺琼盆地构造演化及其成盆动力学机制分析"

摘　　要：莺歌海盆地位于印支半岛与南海北部大陆边缘交接区,复杂的地质构造背景使其形成演化的动力学机制成为国内外的研究焦点,其中盆地裂后期快速沉降的动力学机制是解决盆地动力学演化机理的关键问题。通过对莺歌海盆地沉降史与滇西高原隆升史对应关系的研究,结合Westaway的含裂后沉积负载响应的下地壳流动的耦合模式,来解释莺歌海盆地裂后期快速沉降的动力学机制。认为莺歌海盆裂后期演化经历了3个阶段,即快速沉降阶段、相对稳定阶段、加速沉降阶段。Yinggehai Basin is located in the junction area between Indo China continental block and northern continental margin of South China Sea. Dynamical mechanism for generation and evolution of Yinggehai Basin has become the debate focus due to its complicated tectonic setting, research on the dynamical mechanism of basin＇s rapid subsidence is the key to solve this problem. Through comparing the history of post rift rapid subsidence of Yinggehai Basin to the corresponding lift history of Dianxi Plateau, and combined with a coupled model incorporating lower crustal flow in response to post-rift sedimentary load, it is drawn a conclusion that three tectonic evolution phases of the Yingehai Basin＇s post rift rapid subsidence are： rapid subsidence phase, relative stable phase and accelerating subsid- ence phase.

关 键 词：下地壳流动 沉积负载 快速沉降 莺歌海盆地 

分 类 号：P553[天文地球—构造地质学]