辽北—吉西南地区早白垩世富碱花岗岩地质特征  

Geologic features of the early Cretaceous alkali-rich granite of the northern part of Liaoning-southwestern part of Jilin Province

作　　者：孙罡[1] 周凯[1] 花艳秋[1] 王凯红[1] 

机构地区：[1]吉林省区域地质矿产调查所,吉林长春130022

出　　处：《吉林地质》2008年第4期20-25,共6页Jilin Geology

摘　　要：辽北-吉西南地区早白垩世富碱质花岗岩主要由碱长花岗岩、石英二长岩组成,同位素年龄为125 Ma左右,岩石化学以富碱、富硅为特征,具A型花岗岩特点,但铝质偏高,又具过铝质花岗岩的特点,应属于后造山期之PA型花岗岩。其构造背景为晚印支期-早燕山期滨太平洋造山带造山晚期坍塌阶段的产物。The early Cretaceous alkali-rich granite of the northern part of Liaoning-southwestern part of Jilin Province is mainly composed of alkali granite,quartz monzonite,its isotopic age is 125 Ma or so,characterized by rich alkali,rich silicon,A type granite,peraluminous granite,which belongs to post orogenic PA type granite,In structural setting,it belongs to postorogenic sediment of the marginal-Pacific orogenic belt,late Indo-Chinese epoch-early Yanshanian.

关 键 词：富碱花岗岩 A型 后造山 辽北-吉西南地区 

分 类 号：P588.121[天文地球—岩石学]