华北克拉通北缘早中生代岩体侵位与地壳变形——以盘山岩体周缘变形及年代学分析为例  

Early Mesozoic Plutonic Intrusion and Crustal Deformation in the Northern Margin of North China Craton:A Case Study on Deformation Surrounding the Panshan Granitic Intrusion and its Chronological Analysis

作　　者：赵丽君[1] 

机构地区：[1]中国地质大学(北京)地学实验中心,北京100083

出　　处：《地质与勘探》2010年第1期102-112,共11页Geology and Exploration

基　　金：教育部新世纪优秀人才支持计划(编号:NCET-05)

摘　　要：克拉通边缘岩浆侵位及其相关的浅层构造变形制约,不仅是深部壳幔相互作用及区域构造应力作用的浅部响应和表现,而且是从克拉通活化发展到造山作用的物质和事件记录之一。通过对燕山东段盘山花岗岩岩体周缘构造变形特征、演化过程的研究,并结合40Ar/39Ar热年代学测试和分析,提出盘山岩体侵位前、侵位时其上覆岩层的构造演化过程:三叠纪末(210-200Ma)盘山岩体侵位前,燕山中东段受南北向挤压作用形成了近东西向的马兰峪复背斜和蓟县逆冲断裂;盘山岩体侵位于先期形成的马兰峪复背斜南翼,并侵蚀了蓟县断裂;蓟县断裂的后期再次活动截切了盘山岩体的周缘向斜。岩体及同缘构造的相互关系表明,华北克拉通北缘地区的中生代早期岩浆形成于强烈的克拉通活化后一个由挤压变形向相对平静期转化的阶段。Magmatic intrusion and its related surfacial defoimation in the margin of Craton are the superficial response and representation of the inter- action between crust and mantle, as well as one of the records of development from reactivated Craton to orogenesis process. By studying the deformation and evolutionary sequences around the Panshan granitic pluton, east-central Yanshan orogenic belt, and 4o Ar/39 Ar thermochronological test and analysis, we present the structural evolutionary process of the overlying strata before pluton intruded as well as it was intruding. The sequences of regional deforma- tion are as follows： before the intrusion of Panshan granitic pluton （late Triassic） , the N-S trend contraction in the east-central Yanshan orogenic belt took place, which resulted in the regional EW-trending Malanyu multi-fold and Jixian thrust fault; then Panshan granitic pluton intruded into the south limb of the Malanyu multi-fold and cut-through the Jixian thrust fault ; later, the reactivity of the Jixiau thrust fault cut off the synclines around the Pans- han granitic pluton. The relationship between the pluton and structures around it indicates that the earlier magma in Mesozoic in the northern margin of the North China craton formed in a cratonic reactivation stage, which is a relatively static stage from compression deformation period to a stable period.

关 键 词：华北克拉通北缘 盘山岩体构造变形 岩体侵位 

分 类 号：P511.1[天文地球—地质学]