摘要
南渡—莲塘岩体属多期侵位的花岗岩类深成岩体，可分解为２个序列７个单元．侵位空间受控于左行走滑剪切带的拉张区，岩体中保留有岩浆液态流动构造和丰富的侵位塑变构造，具有以主动侵位为主，被动侵位为辅的双重特征．各种构造型式表明：岩浆的演化和侵位与博白—岑溪断裂带多期走滑有关，可厘定为一种新的剪切脉动侵位机制．
Nandu-Liantang pluton is a multiphase intrusive granitic pluton which can be identified into two series and seven units. The emplacement space is controlled by the extensional jogs of the sinistral strike-slip shear zones, and within the pluton there are original magmatic flow structures and abundant intrusive plastic deformation structures, indicating a double- character of the dominant forceful intrusion and the auxiliary passive intrusion.Various structural patterns show that the magma evolution and intrusion are closely related to the multiphase strike-slip shear zones of the Bobai-Cenxi fracture zone, and mostly for this reason,it can be identified as a shearing-pulse emplacement mechanism.
关键词
花岗岩
侵位机制
剪切带
岩组分析
granite
emplacement mechanism
shear zones
fabric analysis
strain analysis
Guangxi
