花岗岩构造与侵位机制研究进展

ADVANCES IN GRANITIC STRUCTURES AND EMPLACEMENT MECHANISMS

近年来对造山带花岗岩构造与侵位机制的研究表明 ,花岗岩不但可以侵位在区域伸展的构造背景 ,也可以侵位在区域挤压 (缩短 )的构造背景。花岗岩侵位受断裂的控制并不是像以前认为的那样明显 ,而是受多种侵位机制的共同作用 ,而构造样式和变形组构则是侵位机制研究的基础。提出了一些新的研究思路和方法。此外 ,对大别山中生代花岗岩构造、侵位机制作了简要讨论。

Great advances have been made on granitic structures and emplacement mechanisms in recent years. Studies on many granitoid plutons in different orogenic belts have got new conclusions: granitoid plutons not only emplaced in the regional extension setting, but also in the regional compressive (shortening) setting. The relationship between granitoid plutons and faults has been attentively investigated in orogenic belts recently. It is much unlikely thought before that emplaced granitoid pluton had been controlled by faults or fractures. In fact, the process of intruding and opening space must have been controlled by multiple emplacement mechanisms. Meanwhile, study on structural patterns and deformed fabrics of granitic pluton is the key to emplacement mechanisms. So we suggest some research ideas and methods in this paper: studies on vertical structural pattern, use aluminium in hornblende geobarometer to determine an emplaced depth, tectonic analyses and deformation sequences, quantification studies on multiple emplacement mechanisms, etc. At last, we discuss the Mesozoic granitic structures and emplacement mechanisms in Dabie mountain orogen.