莺歌海盆地岩石圈不同圈层伸展量模拟  

STRETCHING FACTOR MODELING OF LITHOSPHERE FOR DIFFERENT LAYERS IN YINGGEHAI BASIN

作　　者：宋维宇[1,2] 

机构地区：[1]中国地质大学(武汉),武汉430074 [2]青岛海洋地质研究所,青岛266071

出　　处：《海洋地质与第四纪地质》2013年第2期73-78,共6页Marine Geology & Quaternary Geology

基　　金：国家重点基础研究发展规划项目(2007CB411700);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。利用盆地同裂陷期正演模拟软件STRETCH和盆地裂后期反演模拟软件FLEX-DE-COMP,结合构造精细解释的高品质地震剖面图,对莺歌海盆地岩石圈不同圈层的伸展量进行定量模拟研究,计算出了盆地上地壳、地壳、岩石圈的伸展量,认为它们发生了与深度相关的伸展,上地壳伸展量β值为1.26～1,地壳伸展量β值为2.3～1.1,整个岩石圈伸展量β值为4～1.1。The Yinggehai basin is located in the juncture area between Indo-China continental block and northern continental margin of the South China Sea.Dynamic mechanism for generation and evolution of the Yinggehai basin has become the debating focus due to its complicated tectonic setting.This paper analyzed the high resolution seismic reflection profiles in this area,and calculated the stretching factor of the upper-crust,crust and lithosphere,using the forward modeling software STRETCH and backstripping modeling software FLEX-DECOMP,suppose the stretch was depth-dependent,the β-factor of upper-crust is between 1-1.26,the β-factor of the whole crust is between 1.1-2.3,and the β-factor of the whole lithosphere is between 1.1-4.

关 键 词：与深度相关的伸展 定量模拟 伸展量 莺歌海盆地 

分 类 号：P736.1[天文地球—海洋地质]