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J4 ›› 2010, Vol. 16 ›› Issue (4): 475-482.

• 构造地质与地球物理学 • 上一篇    下一篇

下扬子区印支—早燕山期的构造特征及应力场模拟

庄建建,杨风丽,赵文芳   

  1. 1. 同济大学 海洋地质国家重点实验室,上海 200092;2. 同济大学 海洋与地球科学学院,上海 200092
  • 收稿日期:2010-05-12 修回日期:2010-07-08 出版日期:2010-12-20 发布日期:2010-12-20
  • 作者简介:庄建建,男,1984年生,硕士研究生,研究方向:构造与油气盆地分析;E-mail:zhuangjj1225@163.com
  • 基金资助:

      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

Tectonic Characteristics and Numerical Stress Field Simulation in Indosinian -Early Yanshanian Stage, Lower Yangtze Region

ZHUANG Jian-jian,YANG Feng-li, ZHAO Wen-fang   

  1.  1. State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China;
    2. School of Ocean and Earth Sciences, Tongji University, Shanghai 200092, China
  • Received:2010-05-12 Revised:2010-07-08 Online:2010-12-20 Published:2010-12-20

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50 mm/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。

关键词: 构造变形, SHELLS有限元, 应变率, 印支&mdash, 早燕山期, 下扬子区

Abstract:

         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.

Key words: tectonic deformation, SHELLS finite element, strain rate, Indosinian-Early Yanshanian Stage, Lower Yangtze region

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