盐边地区晋宁-澄江期火成岩组合及构造环境  

Igneous Rock Assemblages and Tectonic Setting during Jinning-Chengjiang Period in the Yanbian Region

作　　者：谢长江[1] 骆志红[1] 罗林洪 

机构地区：[1]四川省地质矿产勘查开发局一〇八地质队,四川崇州611230

出　　处：《四川地质学报》2016年第3期372-377,385,共7页Acta Geologica Sichuan

摘　　要：四川老盐边地区内晋宁期岩浆岩十分发育,从基性—中性—酸性的各类侵入岩体达30余处,出露面积大于200km^2,年龄910~775.6Ma。侵入岩发育了辉长岩→闪长岩→石英闪长岩→花岗闪长岩→二长花岗岩→斜长花岗岩→碱长花岗岩系列,岩石具较典型的高硅富钠贫钾特征。根据冯艳芳、邓晋福等TTG岩套分类命名方案,区内中酸性岩类主要为英云闪长岩,少量花岗岩和花岗闪长岩。对比已有研究结果,该火成岩组合属活动大陆边缘弧(科迪勒拉型)的火成岩组合,应形成于前震旦纪原特提斯大洋俯冲作用的构造环境。Igneous rock masses during Jinning-Chengiiang Period, with an age of 775.6-910 Ma, are widely exposed in the Yanbian region with an area of about 200 km^2. They form a gabbro-diorite-quartz diorite- granodiorite-monzogranite-plagiogranite-alkali-feldspar granite series which is characterized by enrichment in Si and Na and depletion in K. According to TTG rock suite classification of Feng Yan-fang and Deng Jin-fu, they are composed mainly of tonalite with a small amount of granite and granodiorite. They belong to Cordilleran type rock association which was developed in tectonic setting of the Proto-Tethys Ocean subduction.

关 键 词：岩石组合 TTG岩套 构造环境 盐边地区 

分 类 号：P588.1[天文地球—岩石学]