华北晚前寒武纪镁铁质岩墙群的流动构造及侵位机制  

The Flow Structures and Mechanics of Late Precambrian Mafic Dyke Swarms in North China Craton

作　　者：侯贵廷[1] 李江海[1] H C HALLS 钱祥麟[1] 

机构地区：[1]北京大学地质学系,100871 [2]多伦多大学地球科学系

出　　处：《地质学报》2003年第2期210-216,共7页Acta Geologica Sinica

基　　金：国家自然科学基金(编号40172066)

摘　　要：华北克拉通中部广泛发育晚前寒武纪镁铁质岩墙群。这些岩墙群未变形和未变质,保存了清晰完好的流动构造,完整地反映了前寒武纪岩浆活动的特征和流动构造,这在世界上是罕见的。通过对晚前寒武纪镁铁质岩墙群的形态和流动构造研究,如:流动线理、矿物组构和磁组构等,提出岩墙群的侵位方向和侵位方式。结合本区岩墙群与燕辽—中条拗拉槽系的关系以及岩墙群的力学性质,探讨本区岩墙群的侵位机制。Late Precambrian mafic dyke swarms are extensively developed in the central North China Craton. These dyke swarms are undeformed and unmetamophosed with beautifull flow structure to show the characteristics of Precambrian magma activity, which is rare in the world. The direction and way of the dyke emplacement are proposed based on the study of the shape and flow structures of Late Precambrian mafic dyke swarms; for example, flow lineation, mineral fabric and magnetic fabric. The origin of dyke emplacement is discussed according to the relation between the dykes and the Yanliao-Zhongtiao aulacogens as well as the mechanics of the dykes.

关 键 词：镁铁质岩墙群 水平侵位 华北克拉通 燕辽-中条拗拉槽系 前寒武纪 侵位机制 流动构造 

分 类 号：P534[天文地球—古生物学与地层学]