那丹哈达地体的构造特征及演化

本文通过那丹哈丹地体与相邻地块在演化历史、构造背景、变形特征等诸方面的差异以及它们之间的断层接触关系确认该地体的存在,通过生物地层学、古地磁学的研究讨论那丹哈达地体自三叠纪至晚侏罗世期间古地理位置的变迁以及地体与古大陆边缘拚贴的时期。最后通过地体拚贴后的构造变动讨论了地体增生的后继效应。     

STRUCTURAL FEATURES AND EVOLUTION OF THE NADANHADA TERRANE

The study of terranes has already become an important subject in research of the Circum-Pacific continental margin. This paper discusses proper understanding of the terrane conception and identifies existence of the Nadanhada terrane according to its difference from the neighbouring massifs in terms of evolutionary history, tectonic background, and deformation features, and to the fault-contact relation between them; analyzes the paleogeographic position variation of the Nadanhada terrane during the Triassic to late Jurassic and the period when the terrane was attached to the ancient continental marging; finally discusses the consequential effects of theterrane accretion from the observed tectonic events after terrane collage.