摘要
在深入探讨下扬子区印支—早燕山期构造变形特征的基础上,应用SHELLS有限元方法模拟了该时期下扬子区的构造应变率和块体位移速率。结果表明:秦岭—大别造山带与郯庐断裂相接地带为强压应力区,南黄海东部为强张应力区,而苏鲁造山带及江绍断裂带为压扭应力区。下扬子地块应变率大小为5.0×10-15/s~1.0×10-14/s,块体位移速率约50mm/a。在该应力场控制下,下扬子地块表现出大规模的南北"对冲"推覆构造样式。
Based on intensive research on the tectonic deformation characteristics in Indosinian-Early Yanshanian stage in the Lower Yangtze region,this paper has simulated the tectonic strain rate and surface velocity through the"thin-shell"finite element method.The modeling results indicate that the area around the junction between Qinlin-Dabie Orogen and Tanlu fault suffered intensively compressional effect,the eastern South Yellow Sea was a strongly tensional area,while the Sulu orogen and the Jiangshao fault were transpressional areas.The average strain rate of the Lower Yangtze region was about 5.0×10 -15 /s^1.0 ×10 -14 /s and the surface velocity was probably about 50 mm/a.Controlled by this kind of tectonic stress field,the Lower Yangtze Block produced massive thrust nappe structures in a ramp style.
出处
《高校地质学报》
CAS
CSCD
北大核心
2010年第4期475-482,共8页
Geological Journal of China Universities
基金
中石化海相前瞻性项目子课题“下扬子区中古生代海相盆地形成演化及油气潜力分析”(YPH08035)资助
关键词
构造变形
SHELLS有限元
应变率
印支—早燕山期
下扬子区
tectonic deformation
SHELLS finite element
strain rate
Indosinian-Early Yanshanian Stage
Lower Yangtze region