塔中隆起下古生界断裂差异变形特征及控制机理

发布时间：2018-02-01 20:47

  本文关键词： 塔中隆起 下古生界 逆冲断裂 分段差异 分期差异 控制机理　出处：《科学技术与工程》2017年33期 　论文类型：期刊论文

【摘要】：塔中隆起断裂差异分段、分期变形特征及其控制机理是学者们关注的重大问题,但一直以来缺乏较为详细的研究。本文在详细的地震解释基础上,分析了塔中隆起主要断裂的分段差异特征,甄别断裂活动期次,进一步探讨了塔中隆起断裂差异变形的控制机理。塔中逆冲断裂多具有分段差异变形特征,体现为沿断裂走向基底卷入和膏盐层滑脱型并存;加里东早期,塔中逆冲断裂在局部构造段存在伸展正断层的活动证据;加里东中期Ⅲ幕,NW向逆冲变形最为强烈,同时大规模发育以NE向走滑断裂;海西早期之后逆冲变形仅存在于部分断裂的局部构造分段。本文研究表明,塔中地区基底构造具有横向差异性,这可能是其下古生界差异变形特征的基础;此外,塔中隆起变形强度也存在分段差异性,其横向差异收缩作用是主要断裂变形差异和活动差异的主控因素,也可能是北东向走滑调节断裂的形成原因。
[Abstract]:The differential segmentation of the Tazhong uplift fault, the characteristics of the stage deformation and its controlling mechanism are the important problems that the scholars pay attention to, but there has been a lack of more detailed research. This paper is based on the detailed seismic interpretation. This paper analyzes the segmental differential characteristics of the main faults in the Tazhong uplift, discriminates the active stages of the faults, and further discusses the controlling mechanism of the differential deformation of the Tazhong uplift. The Tazhong thrust faults have the characteristics of segmental differential deformation. It is embodied in the coexistence of basement involvement and gypsum detachment along the fault strike. In the early Caledonian period, the Tazhong thrust fault has active evidence of extensional normal fault in the local tectonic segment. The NW thrust deformation was the strongest in the middle Caledonian stage 鈪，

本文编号：1482838