学术
摘 要:
鲁西地区晚中生代以来的伸展构造（如正断层）多是由中生代逆断层负反转而形成的,既继承了早期构造特征,又在新的构造应力场条件下出现了新的活动特点,从而造成构造活动的多期性、方向上的多变性,呈现出复杂的构造样式。运用物理模拟方法,采用相似理论,对鲁西隆起晚中生代以来的复合伸展构造和演化史进行了模拟,实验半定量-定量得出鲁西隆起晚中生代以来的构造模式主要为一陡一缓断层组成的掀斜断块,主要经历了晚白垩世、古新世和始新世3个伸展时期,且缓倾斜断层发育时间略晚于陡倾斜断层。这些伸展构造在形成机制上主要受控于北东-南西向的伸展作用和垂向上的岩浆上涌。[著者文摘]
文章出处:
《新疆石油地质》-2007年28卷4期 -490-493页
栏目信息:
分 类 号:
文献标识码:
A
文章编号:
1001-3873（2007）04-0490-04
Physical Modeling of Extensional Structures Since Late Mesozoic in Luxi Uplift
SHI Xiu-peng, LI Li （Faculty of Geo-Resources and Information, China University of Petroleum, Dongying, Shandong 257061, China）
Abstract:
The extensional structures like normal fault since late Mesozoic in Luxi （west Shandong） are mostly formed by negative reverses from the Mesozoic thrust faults. They have both inherited early structural features and appear new active characteristics under new tectonic stress field. Therefore, they are normally characterized by multi-phase and multi-direction and complex styles in structural activity. This paper presents the physical modeling of the complex extensional structures and their evolution histories since late Mesozoic in Luxi uplift using analogy theory. The quantitative and semi-quantitative experiments show that the structural patterns since late Mesozoic in Luxi uplift appear the steep-flat alternative tilted blocks, and undergo three extensional periods of late Cretaceous, Paleocene and Eocene. Also, the flat faults occur somewhat later than the steep faults. Mechanically, the extensional structures are controlled by NE-SW extension and vertical magma upweiling.[著者文摘]
Key words:
Luxi （west Shandong） uplift; late Mesozoic; extensional structure; physical modeling
基金资助:
华北东部前第三系构造及其演化特征研究（XQ-2004-03-01）资助本文实验得到中国石油大学（华东）王伟锋教授的悉心指导和李二党、冯阵东先生的热情帮助,在此一并致谢.
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