地质与勘探2017，Vol.53Issue(3)：482-494,13.
内蒙古多伦中酸性侵入岩岩石地球化学特征及构造环境分析
Geochemical Characteristics of Intermediate-Acid Intrusive Rocks and Tectonic Environment in Duolun, Inner Mongolia
摘要
Abstract
Four intermediate-acid rock masses are distributed in the north of Duolun county in Inner Mongolia,in type which are monzonitic granite,quartz-syenite,quartz-orthophyre and quartz monzonite porphyry,with exposed area about 0.5 km2-12.4km2 and stock occurrence.The results of isotope dating suggest that the rough formation time of these four rock masses are about 138.38 ～ 144.25Ma,attributed to late Jurassic epoch(J3).These rocks are part of high-potassium and calcium alkaline rock series.On the basis of geochemical characteristics of rocks we can deduce that they have the same source features,and are the results of magmatic homologous evolution.Their magma source is from the middle and lower crust.The Q-Ab-Or-H2O phase diagram indicates the magmatic crystallization temperature was between 700℃ and 800℃.Monzonitic granite formed in a continental collision dynamic environment,i.e.,a continental orogenic environment.The quartz-syenite,quartz-orthophyre and quartz monzonite formed in a post-orogenic tectonic environment.So we can deduce that the tectonic environment of the study area might have probably experienced continental collision orogenic movement-post orogenic extensional movement during late Jurassic epoch(J3) to early Cretaceous epoch(K1).关键词
中酸性岩体/岩石地球化学特征/构造环境/多伦/内蒙古Key words
intermediate to acid rock mass/geochemical characteristics of rocks/structural environment/Duolun/Inner Mongolia分类
天文与地球科学引用本文复制引用
王春林,孟明亮,陶瑞..内蒙古多伦中酸性侵入岩岩石地球化学特征及构造环境分析[J].地质与勘探,2017,53(3):482-494,13.基金项目
内蒙古矿产地质调查基金项目(编号:NMKD2009-12)资助. （编号:NMKD2009-12）
