东昆仑—西秦岭造山带对接处三叠纪花岗质岩石时空演化、物源特征对比及其大地构造意义

造山带组成与演化是大地构造研究的主要课题, 造山带之间的对接关系更是造山带研究的重要节点。在两大造山带对接地带, 构造-岩浆演化的对比, 特别是深部物质组成结构和基底属性的对比, 可为完整认识造山带的物质组成和构造演化提供重要的依据。基于花岗质岩石同位素填图(Sm-Nd、Lu-Hf)在其年代学、区域性大面积展步和易于示踪等方面的优势, 区域性的同位素填图逐步成为一项重要的技术方法, 应用于探讨造山带深部组成结构, 对比造山带基底属性异同。

Temporal-spatial Variations, Sources and Tectonic Significances of the Triassic Granitic Rocks in the Junction Part of the East Kunlun and West Qinling Orogen, Central China

The composition and evolution of orogen is the main subject of tectonic study, and the connection relationship between orogens is an important node in orogenic study. In the junction part of two orogenic belts, the contrast of tectonic-magmatic evolution between two orogens, especially contrast of deep crustal composition structure and basement affinity, can provide an important basis to completely under-stand the basement nature and tectonic affinity of the orogen. Based on its advantages in geochronology, regional widely distributed and easily tracing, Nd-Hf isotopic mapping for granitic rocks has gradually be-come an effective approach to delineate tec-tono-thermal evolution of the orogen, elucidate oro-genic composition and contrast basement nature be-tween two orogens.