绩溪东部花岗岩基的岩石谱系单位划分与岩体定位机制分析

LITHODEMIC DIVISION OF GRANITIC BATHOLITHS AND EMPLACEMENT MECHANISM OE GRANITIC INTRUSIONS IN EASTERN JIXI, ANHUI

绩溪东部发育陆壳改造型(S)花岗岩,具有成分和结构演化序列。根据同源岩浆演化的观点,岩石谱系单位的划分方法,将绩溪东部地区归并成伏岭序列和扬溪序列。并从侵入体的组构,围岩蚀变变质、变形特征和区域构造特征分析,提出了岩体定位的岩墙扩张机制、顶蚀机制和底辟机制。

There occur continental crust transformation-type granites in eastern Jixi, Which are characterized by sequences of compositional and structural evolution. From the viewpoint of comagmatic evolution and using the method of lithodemic division, the rocks in the eastern part of Jixi are incorporated into the Fulin sequence and Yangxi sequence. On the basis of an analysis of the fabrics of the intrusions, alteration and metamorphism of surrounding rocks, features of deformation and regional structure, this paper puts forward the mechanisms of dike expansion, stoping and diapirism for emplacement of intrusions.