辽西朱碌科地区海西—印支期花岗质岩石特征及成因  

GEOLOGY AND GENESIS OF THE HERCYNIAN-INDOSINIAN GRANITIC ROCKS IN ZHULUKE AREA,WESTERN LIAONING PROVINCE,CHINA

作　　者：鲍庆中[1] 郭胜哲[2] 张立东[2] 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110004 [2]沈阳地质矿产研究所,辽宁沈阳110033

出　　处：《地质与资源》2003年第2期65-71,共7页Geology and Resources

基　　金：地质矿产部"K50E015024(朱碌科镇)等两幅1:5万区域地质调查"项目阶段性研究成果.

摘　　要：朱碌科地区花岗质岩石侵位时间为二叠—三叠纪.按岩石谱系单位划分原则,由早到晚划分为中官营子和榆树林子两个超单元,前者由西窑单元、二道沟单元组成,后者由李台子、碾盘山和敖包山单元组成.岩浆成因类型为介于“I”型和“S”型花岗岩之间的过渡类型.它们均形成于造山晚期构造环境,与南蒙古复合造山作用有直接关系.The granitic rocks in Zhuluke area,Western Liaoning,emplaced during Late Hercynian Indosinian cycle,with Rb Sr isochronal dating age of 226.8～ 260 Ma.According to the classification principles of lithological lineage units,the granitic rocks may be divided (in descending order)into Zhongguanyingzi (including Xiyao and Erdaogou units)and Yushulinzi (including Litaizi,Nianpanshan and Aobaoshan units)super units.The magma evolved from intermediate to acid in nature.Genetically,they are the transition between I type and S type granites,formed in the tectonic environment of late orogenic epoch,directly related to the South Mongolian compound orogeny.<P>

关 键 词：朱碌科地区 海西-印支期 辽宁西部地区 成因 岩石特征 “S”型花岗岩 “Ⅰ”型花岗岩 中官营子超单元 榆树林子超单元 

分 类 号：P588.121[天文地球—岩石学] P581[天文地球—地质学]