桂北元宝山花岗岩体中电英岩包体的应变测量和分析

Strain measurement and analysis of tourmalite-quartz enclaves in Yuanbaoshan pluton,northern Guangxi

在系统的野外地质调查基础上,通过对元宝山花岗岩体地质特征的分析,运用岩石有限应变测量、应变分析等方法,着重分析了元宝山花岗岩体中电英岩包体的应变特征,确定了电英岩包体的变形时代和原因。系统地开展了元宝山花岗岩体中电英岩包体的三维有限应变测量和应变分析。结果表明:电英岩包体的应变型式可分为3种:平面型应变(K=1)、压扁型应变(0<K<1)和收缩型应变(1<K<∞),且以平面型应变为主,有少量的压扁型应变和收缩型应变。

On the basis of the achievements obtained in geological systemic investigation and analyzing geological characteristics,the authors mainly studied the strain characteristics,genesis and the age of deformation of tourmalite-quartz enclaves.Three-dimensional finite strain measurement and strain analysis of tourmalite-quartz enclaves in Yuanbaoshan pluton were carried out successively.The results show that the three strain patterns of tourmalite-quartz enclaves are plane strain（K=1）,flattening strain（0K1） and contraction strain（1K∞）.The pattern of strain of tourmalite-quartz enclaves in Yuanbaoshan pluton is mainly plane strain,with minor flattening strain and contraction strain.