殷马断裂带在桐柏山—大别山造山带中的地质意义探讨  

Discussion on Geological Significance of Yindian-Malong Fault in Tongbai-Dabie Mountains

作　　者：刘欢[1] 宋传中[1] 林寿发[1,2] 韩建军[1] 马涛[1] 由夏斌 

机构地区：[1]合肥工业大学资源与环境工程学院,中国合肥230009 [2]加拿大滑铁卢大学地球科学系

出　　处：《地质论评》2015年第1期95-108,共14页Geological Review

基　　金：国家自然科学基金"长江中下游地区中生代构造体制转换的精细过程研究"(编号41272222);中国地质调查局科研项目"扬子板块北缘中生代构造演化与成矿"的成果

摘　　要：殷店—马垅断裂带是桐柏—大别造山带南缘一条重要的韧性断裂带,是桐柏—大别造山带内部发育的一条明显的岩地层单元界线,同时也是华北和扬子两大板碰撞挤压的产物。它与桐柏—大别造山带的形成,发展和演化,有着密不可分的联系。通过对殷店—马垅断裂带东西段野外岩性剖面对比分析、显微构造对比、有限应变测量对比分析、应力场分析等,发现尽管东、西段构造特征略有差异,但是殷店—马垅断裂整体是具有右旋运动性质的剪切带,殷店—马垅断裂带的形成对华北与扬子碰撞所产生的应力具有消减转移效应,它本身是一个塑性剪切最强的断裂带,它反映了造山带内部不同岩性的块体之间右旋流变的运动学模式,同时也可能充当着桐柏—大别山核部岩块相对扬子板块向东运动的的"润滑带"。Yindian--Malong fault zone is one of the most important ductile shear zone in Tongbai--Dabie southern margin. It is the rock stratigraphic unit boundaries in Tongbai--Dabie mountains. It is also the product of the collision of Yangtze plate and the North China plate. It has prominent significance in Tongbai--Dabie orogeny belt. By comparative analysis of the lithology and Microstructure and finite strain measurement and so on between eastern and western section of Yindian--Malong fault zone, we can find that Yindian--Malong fault is a dextral shear zone , despite there is a little difference beween its eastern part and western part. It has an abatement-- transfer effect on the collision stress between Yangtze plate and Tongbai--Dabie orogeny belt. It is the strongest band of plastic flow, and acts as a lubricant between Tongbai--Dabie and Yangtze plate.

关 键 词：桐柏—大别造山带 殷店—马垅断裂 右旋 

分 类 号：P542[天文地球—构造地质学]